The Kynix Components

TL082 is an Op Amp IC. In detail, it is a high speed JFET input dual operational amplifier. High speed, low cost, this device comes with an internal trimmed offset voltage. It is available with a fast slew rate, a large bandwidth gain, and a low power supply.This blog provides you with a basic overview of the TL082 op-amp, including its pin descriptions, functions and specifications, producers, etc., to help you quickly understand what TL082 is. If this blog can be helpful to you, we will be very honored. Of course, if you have any questions, do not hesitate to leave your comments.Circuits: Magnet Motion Detector using TL082 Op-AmpCatalogTL082 PinoutTL082 CircuitTL082 ApplicationsTL082 FeaturesTL082 AdvantageTL082 PackageTL082 ParametersTL082 ManufacturerTL082 DocumentsComponent DatasheetFAQTL082 Pinout TL082 CircuitSchematic for Inverting Amplifier Application100-kHz Quadrature OscillatorTL082 Functional Block DiagramTL082 Applications• Solar energy: string and central inverter• Motor drives: AC and servo drive control and power stage modules• Single phase online UPS• Three phase UPS• Pro audio mixers• Battery test equipmentTL082 Features• Wide common-mode Rejection ratio of 70dB to 86dB and wide voltage supply range• A low input bias current• Less Power Requirement• Internal frequency compensation• Supply current is 1.4mA which is very low• Low offset current• No requirement of a latch• High input impedance JFET input stage• Short-circuit protection for output• A large gain bandwidth of 3MHz• High input impedance• Slew rate is high typically 16 V/µs• Operating temperature range is from –55 °C to +125 °CTL082 AdvantageTL082 Op Amp• The TL082 is a high-speed, low-cost, wide-bandwidth dual JFET input operational amplifier.• The component has an internally trimmed offset voltage. It has a fast slew rate and low supply current.• This JFET input device can be extended with low offset and input bias currents.• The TL082 is electrically compatible with the LM1558 and is used to improve the overall performance of the LM1558 device.• With high input impedance and low total harmonic distortion, this device features low noise and offset voltage drift.• The amplifier is widely used in audio preamplifiers, sample-and-hold amplifiers and peak detectors, and active filters.TL082 PackagePDIP (P)SO (PS)SOIC (D)TSSOP (PW)TL082 ParametersNumber of channels (#)2Total supply voltage (Max) (+5V=5, +/-5V=10)30Total supply voltage (Min) (+5V=5, +/-5V=10)7Rail-to-railIn to V+GBW (Typ) (MHz)3Slew rate (Typ) (V/us)13Vos (offset voltage @ 25 C) (Max) (mV)6Iq per channel (Typ) (mA)1.4Vn at 1 kHz (Typ) (nV/rtHz)18RatingCatalogOperating temperature range (C)-40 to 85, 0 to 70Offset drift (Typ) (uV/C)18FeaturesStandard AmpsInput bias current (Max) (pA)200CMRR (Typ) (dB)86Output current (Typ) (mA)10ArchitectureFETTL082 ManufacturerTexas Instruments Inc. (TI) is an American technology company that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globally. Its headquarters are in Dallas, Texas, United States. TI is one of the top ten semiconductor companies worldwide, based on sales volume. Texas Instruments’ focus is on developing analog chips and embedded processors, which accounts for more than 80% of their revenue. TI also produces TI digital light processing (DLP) technology and education technology products including calculators, microcontrollers and multi-core processors. To date, TI has more than 43,000 patents worldwide.TL082 DocumentsWhat is an op amp?How to lay out a PCB for high-performance, low-side current-sensing designsCompensation Methodology for Error in SK Low-Pass Filter, Caused by Limited GBW Component DatasheetTL082 DatasheetFAQWhat is TL082?Op Amp IC What type of amplifier does TL082 come with?High speed JFET input dual operational amplifier What is the TL082 compatible with?LM1558 What does the TL082 have?Fast slew rate and low supply current

MCP3008 is a low cost 8-channel 10-bit analog to digital converter. This blog covers the detailed information of the MCP3008 A/D converter, including its pinout, parameter, features, where and how to use it, etc, Raspberry Pi setup tutorial video will be attached down below as well.This is a basic tutorial of how to setup an Analog to Digital Converter (MCP3008) with the Raspberry Pi.CatalogMCP3008 DescriptionMCP3008 PinoutMCP3008 FeaturesMCP3008 ParameterMCP3008 Functional Block DiagramMCP3008 Equivalent &AlternativeWhere to use MCP3008How to use MCP3008MCP3008 Simple Interfacing ExampleMCP3008 ApplicationMCP3008 PackageMCP3008 ManufacturerComponent DatasheetFAQMCP3008 DescriptionMCP3008 is a 10-bit Analogue to Digital converter having eight single-ended input channels. It has a 4-wire serial SPI-compatible interface that is used to get digital output for all channels. It has an onboard sample and holds circuitry. It provides both analog and digital ground connections which help in noise reduction. It is ideal for use in embedded systems applications.  MCP3008 is programmable to provide four pseudo-differential input pairs or eight single-ended inputs. Differential Nonlinearity (DNL) and Integral Nonlinearity (INL) are specified at ±1 LSB. Communication with the devices is accomplished using a simple serial interface compatible with the SPI protocol. The devices are capable of conversion rates of up to 200 ksps.   MCP3008 devices operate over a broad voltage range (2.7V - 5.5V). Low-current design permits operation with typical standby currents of only 5nA and typical active currents of 320 µA. The MCP3004  is offered in 14-pin  PDIP, 150 mil  SOIC and TSSOP packages, while the MCP3008  is offered in 16-pin PDIP and  SOIC packages.MCP3008 PinoutMCP3008MCP3008 Pinout Pin NumberPin NameDescription1-8CH0 to CH7These are the analog inputs for channel 0 to channel 7. These channels can be configured as four single-ended inputs or two pseudo-differential pairs. In pseudo-differential mode, each channel pair are programmed as the IN+ and IN- inputs by sending a serial command string.9DGNDThis is the digital ground pin which is linked internally to the digital circuitry of chip.10CS`/SHDNIt is a Chip Select pin. This pin is used to initiate communication with the device by connecting it to low logic level. If it is already low, then it should be pulled to high and then low for initiating communication. When it is pulled to high logic, it will end a conversion.11DinThis is the input pin for serial data.12 DoutIt is the serial data output used for SPI communication. On every falling edge of clock signal, data will change, and this converted data is shifted out on this pin.13 CLKIt is a serial clock signal used to initiate a conversion and sends each bit out as conversion takes place14AGNDIt is the analog ground pin which is connected internally with analog circuitry. It is connected to the reference voltage.15 VREFIt is connected to the reference voltage and is used to determine the range of analog voltage.16VDDIt is the connection for applying a positive voltage to the circuit.MCP3008 Features10-bit resolution± 1 LSB max DNL± 1 LSB max INL4 (MCP3004) or 8 (MCP3008) input channelsAnalog inputs programmable as single-ended or pseudo differential pairsOn-chip sample and holdSPI serial interface (modes 0,0 and 1,1)Single supply operation: 2.7V - 5.5V200 ksps max. sampling rate at VDD = 5V75 ksps max. sampling rate at VDD = 2.7VLow power CMOS technology5 nA typical standby current, 2 µA max.500 µA max. active current at 5VIndustrial temp range: -40°C to +85°CAvailable in PDIP, SOIC and TSSOP packagesMCP3008 ParameterManufacturer:Microchip TechnologySeries:-Packaging:TubePart Status:ActivePackage / Case:16-DIP (0．300" 7．62mm)Supplier Device Package:16-PDIPMounting Type:Through HoleBase Part Number:MCP3008Number of Bits:10Sampling Rate (Per Second):200kNumber of Inputs:4 8Input Type:Pseudo-Differential Single EndedData Interface:SPIConfiguration:MUX-S/H-ADCRatio - S/H:ADCNumber of A/D Converters:1Architecture:SARReference Type:ExternalVoltage - Supply Analog:2．7V ~ 5．5VVoltage - Supply Digital:2．7V ~ 5．5VFeatures:-Operating Temperature:-40°C ~ 85°CMCP3008 Functional Block DiagramMCP3008 Equivalent &AlternativePCF8591, ADC0808, ADC0804, ADS11115Where to use MCP3008The MCP3008 is an 8-Channel 10-bit ADC IC, which means it can measure 8 different analog voltages with a 10-bit resolution. It measures analog voltage from 0 to 1023 and sends the result to a microcontroller or microprocessor via SPI communication.  It can operate on both 3.3V and 5V, so it can be used with both 5V and 3.3V microcontrollers, such as the Raspberry Pi. It employs the SAR method to convert analog voltage to digital value; it might not the fastest or the most precise ADC on the market, but it is the cheapest and easiest to use. Some devices, such as the Raspberry Pi, lack hardware for analog to digital conversion and thus cannot read analog inputs. As a result, a circuit is required for this conversion. The MCP3008  chip can be used in such devices. For communication, this chip employs an SPI interface. The  Raspberry Pi requires only four  GPIO  pins. Using this chip, you can get an additional 8 analog inputs. Analog outputs are used by sensors. As a result, many devices require an ADC converter to read these outputs. The MCP3008  is capable of converting analog signals to digital signals. So, if you're looking for an ADC IC with a resolution of 10-bit (0-1023), 8-channels, and a reasonable speed, this IC might be a good fit. It is very popular with Raspberry Pi because it lacks an ADC feature by default.How to use MCP3008It is made up of the well-known  SAR ADC  architecture technology, which includes a built-in sample and a capacitor. On the first rising edge of the clock cycle, this architecture samples with a sample/hold capacitor for 1.5 clock cycles. Following that, the ADC generates a 10-bit digital output based on the charge value of the S/H capacitor. By bringing the CS line low, communication with the MCP3008  device is initiated. The first bit received on the first clock signal (when CS is low and DIN is high) will be a start bit. This is followed by the SGL/DIFF bit, which determines whether the conversion is single-ended or differential. Following that, the next three bits, D0, D1, and D2, are used to select the channel. After receiving the start bit on the fourth rising edge of the clock, the sampling of analog inputs will begin. Down below is the detailed diagram.MCP3008 Simple Interfacing ExampleMCP3008 ApplicationSensor InterfaceProcess ControlData AcquisitionBattery Operated SystemsMCP3008 PackageMCP3008 ManufacturerMicrochip Technology Inc. is a leading provider of microcontroller and analog semiconductors, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applications worldwide. Headquartered in Chandler, Arizona, Microchip offers outstanding technical support along with dependable delivery and quality.Component DatasheetMCP3008 AD Converter DatasheetFAQWhat type of interface does MCP3008 have?4-wire serial SPI compatible What does MCP3008 help in?Noise reduction What type of applications is MCP3008 ideal for?Embedded systems applications What types of packages are MCP3008 offered in?16-pin PDIP and SOIC packages How many different analog voltages does the MCP3008 measure?8 different analog voltages with a 10-bit resolution What method does the MCP3008 use to convert analog voltage to digital value?SAR How many GPIO pins does the MCP3008 require?Four GPIO pins What does the MCP3008 require to read analog outputs?ADC converter

IntroductionLM386 is a low voltage audio power amplifier. LM386 adopts 8-pin double in-line plastic package with a working voltage of 4V-15V. When the power supply voltage is 12V, 300mW output power can be obtained on an 8Ω load. Various oscillators can be easily produced with LM386.CatalogIntroductonCatalogI Simplest OscillatorII Blocking OscillatorIII Electronic PianoIV Square-wave OscillatorV Sinusoidal OscillatorFAQOrdering & QuantityI Simplest OscillatorFigure 1. Circuit of Simplest OscillatorIn Figure 1, the output end and in-phase input end of LM386 are connected by piezoelectric ceramic chip HTD. The amplifier forms positive feedback and generates oscillation. Here HTD is both a feedback capacitor and a sound-generating device.Component parameters in the figure: D1~D4 are 1N4001, C1=220pF, HTD is a piezoelectric ceramic sheet with an auxiliary acoustic cavity.II Blocking OscillatorFigure 2. Circuit of Blocking OscillatorAs shown in Figure 2, a simple oscillator consists of LM386, C3, C4, and loudspeakers. RP and C2 make this oscillator produce blocking- oscillation,  After connecting the power supply, LM386 does not work because the initial terminal voltage of C2 is zero, and the power supply charges C2 through RP. When the C2 charging voltage is higher than a certain value, the LM386 oscillator starts to vibrate. As the amplitude continues to increase, the current consumption of the oscillator also increases. This current flows through RP, and its voltage drop on RP also increases, causing the LM386 power supply terminal 6 pin voltage to continue to drop. Eventually, the LM386 cannot work and the oscillator stops. The power supply recharges C2 via RP again, causing the voltage at C2 to rise. When the voltage at C2 rises to a certain value, the LM386 oscillator starts again. In this way, the oscillator will produce blocking-oscillation, and the speaker emits a “beep, beep, beep” sound.Component parameters in the figure: D1~D4 are 1N4001.  C1=C3=220μF，C2=47μF.C4=0.01μF，RP=4.7K.III Electronic PianoFigure 3. Circuit of Electronic PianoFigure 3 is a simple electronic piano circuit. On pin 3 of LM386, the integrated circuit has a 10KΩ resistor to ground. This built-in resistor and ten scale resistors RP1~RP10 constitute the timing resistor of the oscillator. C2 is the timing capacitor. By adjusting the values of RP1~RP10, the speakers can sequentially emit musical sounds from low octave "do, re , mi" to high octave "do, re, mi". KI~K10 are key switches.Component parameters in the figure: Cl=C3=220μF.C2=2200μFIV Square-wave OscillatorFigure 4. Circuit of Square-wave OscillatorFigure 4 shows a square-wave oscillator composed of LM386. R1 is the timing resistor. C2 is the timing capacitor. R2 and R3 provide voltage bias for LM386 in-phase input. Because the voltage at the C2 terminal cannot change abruptly, the inverting input terminal pin  2 of the LM386 is low level, and pin 5 is the midpoint of the internal OTL output stage of the amplifier. It is 1/2Voc in a static state, and it is supplied to the third-phase input pin 3 after dividing pressure via R2 and R3. Obviously, the potential of this pin is higher than the second pin. Therefore, pin 5 outputs a high level. This high-level charges C2 via R1. When the voltage of the C2 terminal is higher than the potential of pin 3, pin 5 outputs a low level. C2 discharges to pin 5 via R1. When C2 is discharged, the potential of pin 2 drops and is lower than the potential of pin 3. Pin 5 outputs high level again. In this way, the circuit forms oscillation.  and the oscillation signal drives the loudspeaker to sound through C3.Component parameters in the figure: C1=C3=220μF，C2=0.33μF.R1=22K，R2=1K.R3=9.4KV Sinusoidal OscillatorFigure 5. Circuit of Sinusoidal OscillatorFigure 5 is a sinusoidal oscillator made of LM386. The circuit adopts Wien bridge oscillation mode, and the output signal distortion coefficient of the circuit is very low. The flashlamp H and the resistor R3 form a negative feedback circuit, which keeps the amplitude of the oscillator output signal stable and has low distortion. When the values of capacitors C1 and C2 are the same, the oscillation frequency of the circuit can be obtained by the formula f=1/2C1 R1R2. In actual production, H can use 3V, 15mA flashlamp.FAQWhat type of package does LM386 adopt?8-pin double in-line plastic packageWhat is the power supply voltage of LM386?12VWhat can be easily produced with LM386?Various oscillatorsHow does an LM386 work?The Lm386 integrated chip is a low power audio frequency amplifier, which uses low level power supply like batteries in electronic circuits. It is designed as 8 pin mini DIP package. This provides voltage amplification of 20. By using external parts voltage gain can be raised up to 200.Is lm386 an op amp?The LM386 is a type of operational amplifier (Op-Amp). ... In an amplifier circuit, the LM386 takes an audio input signal and increases its potential anywhere from 20 to 200 times. That amplification is what's known as the voltage gain.What is lm386 IC?The LM386 is an integrated circuit containing a low voltage audio power amplifier. It is suitable for battery-powered devices such as radios, guitar amplifiers, and hobby electronics projects.How do you calculate lm386 gain?Voltage Gain Analysis:Without any external components, it has a gain of Gv = 2x15K/(150+1350) = 20 (26 dB).With a capacitor (or shortcutting) between pins 1 and 8 , it has a gain of Gv = 2x15K/150 =200 (46dB).Which IC is used in audio amplifier?The IC LM386 is a low-power audio amplifier, and it utilizes low power supply like batteries in electrical and electronic circuits. This IC is available in the package of mini 8-pin DIP.What are some projects that use the LM386 audio amplifier circuit?LM 386 is an integrated class AB amp and is good for beginners small audio amplifier applications…for example in a RF receiver,small Stereo system,cheap low voltage amplifier etc…drawbacks is that it cannot handle much power and hence creates distortion when you crank up the volume too much.. So other ICs are used in practical.How to make an LM386 audio amplifier circuit?

Temperature setting controller is widely used in high and low voltage power distribution cabinets, terminal boxes, substations, used for real-time detection of environmental temperature and humidity changes, and the protection of power electronics devices. It is also commonly used in places requiring temperature and humidity detection and comprehensive control, such as vegetable greenhouses, granaries, etc.  This paper designs a temperature setting controller which used temperature sensor AD592, lon sensor HDP 07 as a detecting component, with four channels of integrated op-amp LM324 as a core control element, it automatically measures and detect the environment temperature, control output, and gives an alarm and protect condensation, etc... It overcomes the shortcomings of existing thermocoagulation controllers that require high software knowledge for design, debugging, and maintenance personnel, complex circuit structure and large temperature response deviation, and simplifies the circuit structure.CatalogI.Control Principle of Temperature Setting ControllerII.Circuit Design  2.1 DC Voltage Regulation  2.2 Partly Design of Temperature Setting ControlIII. The text 3.1 Adjustment and Testing of Temperature Control 3.2 Adjustment and Testing of Condensation ControlIV. ConclusionFAQOrdering & Quantity I.Control Principle of Temperature Setting ControllerThe LM324 voltage comparator is used as the main control chip of the temperature condensation controller. The temperature sensor is used to convert the temperature change into the current change, and the condensation sensor is used to convert the humidity change into the resistance change. The LM324 voltage comparator controls the temperature condensation Controller to achieve alarm display and output. The principle block diagram of the temperature condensation controller based on the LM324 voltage comparator is shown in Figure 1.Figure 1: Block Diagram of LM324 Based Temperature Condensation ControllerII.Circuit DesignThe circuit design of the temperature condensation controller based on LM324 voltage comparison mainly includes the design of two parts, the DC stabilized power supply and the temperature condensation control,  The main components of the controller include temperature and humidity sensors, which are connected to the control circuit board through the base through four wires of red, blue, black and yellow, and the dial connected to the control circuit board, and finally packaged by the shell. 2.1 DC Voltage RegulationThe power supply part of the temperature coagulation controller circuit designed in this paper is composed of a DC stabilized power supply module, a sensor input module, an alarm display module, a voltage comparison module, etc. Basically, all electronic products are powered by a DC power supply, and the daily grid voltage is AC 220V, so the AC power must first be converted into DC power to provide a stable DC power supply for the circuit. This thermocoagulation controller needs to provide 8V for the voltage comparison module It also provides 12V DC for the output relay module. After voltage regulation by the transformer, it is rectified by a bridge rectifier circuit composed of four diodes, filtered by a capacitor, and output by a three-terminal integrated voltage regulator. 2.2 Partly Design of Temperature Setting Control The temperature condensation control part design adopts an LM324 voltage comparator as the main control chip of the whole temperature condensation control circuit. LM324 is a four-channel integrated operational amplifier with a true differential input. It is composed of four groups of completely independent operational amplifiers. Its main function in the circuit is to compare the input voltage and the reference voltage, change the output voltage according to the level of the two-channel voltage， and perform the corresponding control output.This thermocoagulation controller uses AD592  as the temperature sensor. AD592  is an integrated temperature sensor. It is a high-performance current sensor launched by American  Analog Devices, which converts temperature changes into the current. It has the advantages of small error, low cost, temperature change, and current change into linearity. Its output current is based on absolute zero (-273°C). For every 1°C increase or decrease in the ambient temperature, it will increase the output current by 1 microampere. The temperature sensor converts the temperature change into a voltage change through a voltage follower and then inputs it to the inverting input terminal of the voltage comparator. The wire-wound potentiometer is connected to the dial to provide a reference voltage and provide it to the non-inverting input terminal of the voltage comparator. If the input voltage of the LM324 voltage comparator is lower than the reference voltage, it means that the ambient temperature is lower than the setting temperature of the dial, and the voltage comparator outputs a high level. At this time, the diode displays an alarm and controls the output. Increase the temperature until the ambient temperature is higher than the settting temperature, the voltage comparator outputs a low level, and the entire temperature control process is a closed-loop system, which can quickly and sensitively control the action of the temperature condensation controller. Figure 2 is the circuit schematic diagram of the temperature control module.Figure 2: Schematic Diagram of the Temperature Control ModuleThis temperature condensation controller selects HDP-07 as the condensation sensor. HDP-07 is a new type of condensation sensor that measures or predicts the occurrence of air condensation through changes in its resistance. Its structure is to make a tree-like current on a ceramic substrate and then coat it with resin and conductive particles to form a resistive film. It has the characteristics of a typical switch-type sensor, which is extremely sensitive to high humidity and presents a high resistance state; in a low humidity environment, it reflects a low resistance state. It has the advantages of small size, short measurement period, quick response, high precision, etc. It overcomes the shortcomings of a complex structure, large volume, complex operation, and low precision of the chilled mirror condensation sensor made of traditional optical principles. It is widely used on occasions that need to control high humidity and condensation. Figure 3 is a schematic diagram of the humidity control module.Figure 3：Schematic Diagram of the Humidity Control ModuleWhen the relative humidity in the ambient temperature reaches 100%, the water vapour in the air will liquefy and condense into dew, and the equipment will malfunction due to humidity and reduce the service life. Therefore, the temperature condensation controller designed in this paper (using the HDP-07 condensation sensor) is used to detect the occurrence of condensation and eliminate it in time. The condensation sensor and the comparator constitute a zero-crossing comparator. Usually, in a low humidity environment, the resistance of the condensation sensor is very small. The sensor reflects the character of switch closure, and the comparator outputs a low level; when the ambient humidity reaches 83% at the critical value, the condensation sensor presents a high-impedance state, and the comparator outputs a high level, to control the electronic switch triode to turn on and display the alarm and control the output to reduce humidity. The temperature condensation based on the LM324 voltage comparator is used as the main control chip compared with the circuit based on software control, the control circuit has a simpler circuit structure, more convenient debugging and assembly use, and lower cost. III.The Text3.1 Adjustment and Testing of Temperature Control(1) BenchmarkTurn the dial scale to 0 degrees, clamp the red test pen of the multimeter to the middle tap of the wire-wound potentiometer, ground the black test pen, turn the multimeter to the DC voltage range, adjust the potentiometer W2, and make the voltmeter read 2.73V. (2) Linear adjustment accuracyFirst, adjust the dial scale to -30 degrees, adjust the potentiometer W2, so that the voltage reading is 2.43V; the second step, adjust the dial scale to 40 degrees, write down the value of the multimeter, if the value is greater than 3.13V, it indicates the slope is too large, then adjust the dial scale to 30 degrees, adjust the potentiometer W1 and re-adjust W2, the voltage reading is 2.43, and then adjust the dial scale to 40 degrees, observe whether the voltmeter reading is 3.13V, if not, repeat step two until the voltage reading is 2.43V. (3) Adjust the accuracy of the temperature sensorAdjust the dial scale to room temperature, adjust the potentiometer WS, so that the temperature alarm indicator diode is on, and adjust the potentiometer back and forth at this critical value, and the temperature indicator will change between on and off in a short time. (4) TestAdjust the dial scale to be lower than room temperature, the temperature condensing controller does not work; adjust the dial scale to higher than room temperature, the temperature alarm indicator of the temperature condensing controller is on, the relay is closed, and the output 220V alternating current indicates that the temperature control part is working normally. 3.2 Adjustment and Testing of Condensation ControlWhen the condensation controller detects, it can add water vapour or breathe on the condensation sensor with the mouth for about 5 seconds. The humidity alarm indicator on the controller is on, the relay is closed, and the output is 220V AC, indicating that the condensation control part can work normally. IV. ConclusionThis article summarizes the design and production of the temperature condensation controller based on the LM324 voltage comparator. The temperature coagulation controller has successfully realized temperature control and condensation generation control through the test. It has the advantages of good stability, strong anti-interference ability, wide adjustment range, high precision, and rapid response. It solves the complex circuit structure of the temperature coagulation controller. , The response accuracy is not high. Only the LM324 voltage comparator is used as the main control chip of the control circuit, which is convenient for assembly and debugging low cost, and does not need to use software control, those are the characteristics of the thermocoagulation controller. It’s suitable for technological innovation and promotion.FAQWhat is widely used in high and low voltage power distribution cabinets?Temperature setting controllerWhat is used to convert the temperature change into the current change?Temperature sensorWhat is lm324?LM324 is a Quad op-amp IC integrated with four op-amps powered by a common power supply. The differential input voltage range can be equal to that of the power supply voltage. Generally, op-amps can perform mathematical operations.Which is the difference between lm324 and lm339?The LM324 has a complementary output while the LM339 is open collector. In the complementary output, current can flow in either direction as required (either source or sink) while the open collector output can only sink current.What is op-amp used for?Operational amplifiers are linear devices that have all the properties required for nearly ideal DC amplification and are therefore used extensively in signal conditioning, filtering or to perform mathematical operations such as add, subtract, integration and differentiation.How does an op-amp work?What is lm324 used for?LM324 IC ApplicationsThe applications of IC LM324 include the following. By using this IC, conventional op-amp applications can be implemented very simply. This IC can be used as oscillators, rectifiers, amplifiers, comparators etc.What is the function of a temperature controller?A Temperature Controller is a device that is used to control a heater or other equipment by comparing a sensor signal with a set point and performing calculations according to the deviation between those values. 

I DescriptionLM1875 is a power amplifier integrated block chip. Its superior performance and attractive tone have been accepted by many enthusiasts, and it was all the rage in the 1990s.LM1875 adopts a TO-220 package structure, which is shaped like a mid-power tube, small in size, simple in peripheral circuits, and large in output power. The integrated circuit introduced in this blog is equipped with overload, overheating and inductive load reverse potential safety protection, which is one of the ideal choices for high-end audio.Figure 1. LM1875CatalogI DescriptionII LM1875 ParametersIII LM1875 Circuit PrincipleIV LM1875 Circuit Assembly and DebuggingV In the EndFAQOrdering & QuantityII LM1875 ParametersVoltage Range 16～60VQuiescent Current50MmAOutput Power25WHarmonic Distortion<0.02%, when f=1kHz, RL=8Ω, P0=20WRated Gain26dB, when f=1kHzWorking Voltage±25VConversion Rate18V/μSIII LM1875 Circuit PrincipleThis circuit is composed of an attenuated tone control circuit controlled separately for high and low sounds, an LM1875 amplifier circuit, and a power supply circuit. Among them, the sound quality control part uses an attenuated tone circuit controlled separately for high and low sounds. The specific components are as follows:R02, R03, C02, C01, W02 form a bass control circuit ;C03, C04, W03 form a treble control circuit ;R04 is the isolation resistance;W01 is the volume controller, which adjusts the volume of the amplifier;C05 is an isolation capacitor to prevent the downstream LM1875 DC potential element from affecting the previous tone circuit.The amplifying circuit mainly adopts LM1875, which is composed of 1875, R08, R09, C066, etc. The magnification of the circuit is determined by the ratio of R08 to R09; C06 is used to stabilize the drift of the LM1875's 4th pin DC zero potential, but it has a certain impact on the sound quality; C07 and R10 function to prevent the amplifier from generating low-frequency self-excitation. In Addition, the load impedance of this amplifier is 4→16Ω.Figure 2. LM1875 CircuitWhat about the power supply circuit of the power amplifier? Please take a look at the picture below. In order to ensure the sound quality of the power amplifier board, we need to pay attention to the following when designing the circuit:The output power of the power transformer shall not be less than 80W;The output voltage is 2*25V;The filter capacitor uses two 4700UF/25V electrolytic capacitors in parallel;Positive and negative power supplies share 4 4700UF/25V capacitors;The two 104 base capacitors are high-frequency filter capacitors;Figure 3. LM1875 CircuitIV LM1875 Circuit Assembly and DebuggingThis blog will introduce the necessary tools for circuit assembly, how to prepare for soldering, and finally how to debug the circuit. Of course, if you still feel like you are still cannot get enough, in the end, you can even follow our tips to try an extra interesting experiment with this circuit.Tools That You NeedA 20W electric soldering iron, preferably with adjustable temperature;A multimeter;A pair of needle-nose pliers;A screwdriver;Some solder wire and pine perfume.How to Prepare for WeldingWelding sequence:① Welding jumpers;② Welding resistance;③ Welding capacitor;④ Welded rectifier tube;⑤ Welding potentiometer;⑥ Weld LM1875.Notes Fix the LM1875 with screws on the heat sink before welding LM1875, otherwise, the screws will be difficult to drive in when the heat sink is installed at the end;The part of LM1875 in contact with the heat sink must be coated with a small amount of heat dissipation grease to facilitate heat dissipation;Pay attention to the welding quality when welding. For beginners, you can practice a few more times on the old circuit board, and then formally solder.How to Debug CorrectlyThe debugging of this power amplifier board is very simple. After the circuit board is soldered with electronic components, we must carefully check the circuit board for soldering errors. Special attention should be paid to electronic parts with polarity, such as electrolytic capacitors and bridge rectifiers. Once the welding is reversed, there is a risk of burning the components.When the transformer is connected, the output terminal of the amplifier is not connected to the speaker, but connected to a multimeter (preferably digital display, and the multimeter is set to DC*2V).In addition, pay attention to the reading of the multimeter when powering on the power amplifier board. Under normal circumstances, the reading should be within 30mV, otherwise we should immediately cut off the power to check the circuit board.If the reading of the electric meter is within the normal range, it indicates that the function of the power amplifier board is basically normal. At this time, we connected the speaker, then input the music signal, and then power on the test machine. Under the correct procedures and specifications, turn the volume potentiometer, the volume should change, and turn the high and low knobs, the tone of the speaker will change.Figure 4. LM1875Experiment Worth Trying First, we will short-circuit C6 and measure the DC potential at the output of LM1875 with a multimeter to see if it is within 30MV. Then, connect the speaker and test for two hours. Use a multimeter to measure the DC potential at the output of the LM1875 to see if the DC potential is within 30MV. If the DC potential is within 30MV, the capacitor C6 can be omitted. In this case, the amplifier board becomes a pure DC power amplifier.V In the EndSo far, the power amplifier board has been successfully installed and adjusted. Looking at this piece of work that you can be proud of and enjoying the wonderful music, are you satisfied?FAQWhat package structure does LM1875 adopt?TO-220What is a LM1875?A power amplifier integrated block chip.

I. IntroductionDC motors are widely used in various fields due to their good speed regulation performance, large starting torque, and strong overload capacity. In recent years, the structure and control methods of DC  motors have undergone great changes. With computers entering the control field and the continuous emergence of new power electronic power components, PWM  (pulse width modulation) speed regulation has become a new way of DC motor speed regulation. And with the advantages of high switching frequency, stable low-speed operation, excellent dynamic performance, and high efficiency, it is widely used in DC motor speed regulation,  Therefore, this paper proposes the design of a DC  motor PWM  control system based on 80C196KC and L298N.CatalogI. IntroductionII. Principle of PWM Speed Control SystemIII. Control System Hardware Design3.1Introduction to Power Integrated Circuit L298N3.2 DC Motor Control System Hardware Circuit3.3 Anti-interference and Electromagnetic Compatibility DesignIV. Control System Software RealizationV. ConclusionFAQOrdering & QuantityII. Principle of PWM Speed Control System PWM, or pulse width modulation, refers to the use of the switching characteristics of high-power transistors to modulate a fixed voltage DC  power supply, which is turned on and off at a fixed frequency, and the length of the on and off time in a cycle is changed as needed. By changing the duty cycle of the voltage on the armature of the DC  servo motor, the average voltage is changed to control the speed of the motor. Therefore, it is often called a switch drive device. The schematic diagram of PWM control is shown in Figure 1.Figure 1 PWM control schematic diagramThere are usually two ways to change the duty cycle: PWM  and  PFM  (pulse frequency modulation).  PWM  is by changing the width of the on-pulse, which is commonly referred to as the fixed frequency width modulation method.  PFM means that the on-pulse width is constant and the duty cycle is changed by changing the switching frequency. Because when it encounters mechanical resonance at a particular frequency, it often results in system vibration and howling. Therefore, in the control of DC motors, the  PWM control method is mainly used. III. Control System Hardware Design The DC  motor speed control system based on 80C196KC and L298N is composed of the smallest single-chip microcomputer system, R/D converter, PWM power amplifier circuit, A/D, and D/A conversion circuit, and receiving command interface circuit. The minimum system of the single-chip microcomputer adopts the 16-bit single-chip 80C196KC external expansion interface circuit, which is mainly used to realize the functions of data acquisition and  PWM signal generation. The block diagram of the speed control system is shown in Figure 2.Figure 2 Block diagram of PWM speed control system 3.1 Introduction to Power Integrated Circuit L298N In order to improve system efficiency and reduce power consumption, the power amplifier drive circuit adopts the integrated circuit L298N based on the bipolar H-bridge pulse width modulation method. L298N is a high-performance pulse-width modulation power amplifier produced by SGS, which has the characteristics of small size and strong driving ability. It contains two H-bridge high-voltage and high-current bridge drivers, which can realize the full-bridge drive of the motor with a single chip, which can drive motors below 46V and 2A. The internal structure of L298N is shown in Figure 3.Figure 3 L298N internal structure block diagram 3.2 DC Motor Control System Hardware Circuit L298N can drive two  DC motors, because the speed control system is a single-axis structure, in order to make full use of the load capacity of the power amplifier circuit, so that the system starts at the maximum acceleration and brakes at the maximum acceleration, in the design, the input terminal and the output terminal are connected in parallel to control the  DC motor.The single-chip 80C196KC gives a PWM signal according to the calculation results of the position loop and the speed loop. The PWM signal is directly output to the IN1 (IN3) terminal, and the PWM signal is inverted and output to IN2 (IN4) through 7406. When the duty cycle of the PWM analog signal is 50%, the positive and negative voltages at both ends of the motor are applied for the same time. The motor is in a state of tremor at this position, that is, in the "power lubrication" state. When the duty cycle is greater than 50%, the signal voltage OUTA is greater than OUTB, and the motor rotates forward, otherwise reverse.Therefore, the output polarity of each link must be straightened out to form negative feedback and complete closed-loop control. Relying on changing the PWM duty cycle to control the motor speed can also change the motor rotation direction, the control method is simple and reliable. In addition, because the motor is of electric coil type, reverse electromotive force will be formed when the motor has an emergency stop and sudden commutation. To ensure the normal operation of the L298N drive chip, two pairs of continuations are added between the output terminals OUTA, OUTB, and the DC motor. The flow diode shunts the current to the positive or ground terminal of the power supply to prevent back electromotive force from damaging the L298N. 3.3 Anti-interference and Electromagnetic Compatibility Design When the motor is driven, the rapid on-off of the power main switching element leads to a large rate of change of power current and voltage, which not only affects the drive circuit but also enters the control circuit through the power supply and ground.In addition, when the motor starts and brakes, the transient voltage is generated at the sudden change of the load, its amplitude will be higher than the power supply voltage, and the leading edge is steep, the frequency band is very wide, and it enters the control circuit through the DC power supply. Therefore, anti-interference and electromagnetic compatibility design is also very important. The system has adopted measures such as current smoothing, deburring, and shielding. Current smoothing: Because the instantaneous energy of the PWM switch is relatively large, the RC filter is used at the output of the PWM power amplifier to filter. By selecting the appropriate resistance and capacitance values, high-frequency harmonics are effectively suppressed and the peak voltage of the PWM power amplifier is absorbed. Thereby reducing the interference; Deburring: The system increases the filter capacitor on the power supply side, and uses one large and one small capacitor in parallel. The large capacitor is responsible for the decoupling, filtering, and smoothing of low-frequency alternating signals, and the small capacitor eliminates mid-and high-frequency parasitics coupling in the circuit network, which effectively reduces spikes and burrs; Shielding: The motor drive cable adopts double-shielded cables, and the wiring should be separated from other cables as much as possible.Figure 4 Drive hardware circuit diagram IV. Control system software realization The control system adopts the speed-position closed-loop combination method, taking the position control method as an example to introduce the realization method of the software. The position control is based on the classic PI control algorithm, and the proportional and integral parameters are simplified design, and the segmented PI control is introduced. , That is, the calculated error is divided into sections, and different proportional and integral parameters participate in the adjustment within the error range of each section, which ensures the smoother and more stable operation of the system. The derivation and simplification process of PI formula is as follows:The specific software implementation flowchart is shown in Figure 5. That is, after receiving a given angle command, first calculate the difference between the sampled position information and the given angle, and then divide the difference into n equal parts, and each segment corresponds to a set of parameters Kp1 and ki1 participate in mediation control, calculate the output of PI control and then convert it into the corresponding PWM numerical output.Figure 5 The specific software implementation flowchart V. ConclusionThis article sums up the design scheme of the DC motor PWM control system based on 80C196KC and L298N. The single-chip microcomputer generates a PWM signal to the power integrated circuit L298N. The classic PI segment control is used to control the motor. It has the characteristics of a simple circuit and convenient control. The operating test results show that the system works stably and reliably, meets the requirements of the speed regulation function, and has been successfully applied to many airborne products.FAQWhat method is the integrated circuit L298N based on?Bipolar H-bridge pulse width modulationWhat type of computer generates PWM signal to the power integrated circuit L298N?Single-chip microcomputerWhat is l298n?This L298N Motor Driver Module is a high power motor driver module for driving DC and Stepper Motors. This module consists of an L298 motor driver IC and a 78M05 5V regulator. L298N Module can control up to 4 DC motors, or 2 DC motors with directional and speed control.What is the use of l298n?The L298N is a dual H-Bridge motor driver which allows speed and direction control of two DC motors at the same time. The module can drive DC motors that have voltages between 5 and 35V, with a peak current up to 2A.How does l298n control DC motor speed?1.If you send a HIGH signal to the enable 1 pin, motor A is ready to be controlled and at the maximum speed;2.If you send a LOW signal to the enable 1 pin, motor A turns off;3.If you send a PWM signal, you can control the speed of the motor. The motor speed is proportional to the duty cycle.What is l298n motor driver module?This L298N Motor Driver Module is a high power motor driver module for driving DC and Stepper Motors. This module consists of an L298 motor driver IC and a 78M05 5V regulator. L298N Module can control up to 4 DC motors, or 2 DC motors with directional and speed control.How does l298n motor driver work?The L298N is a dual H-Bridge motor driver which allows speed and direction control of two DC motors at the same time. The module can drive DC motors that have voltages between 5 and 35V, with a peak current up to 2A.How do i use a l298 motor driver with Arduino?Start by connecting power supply to the motors. In our experiment we are using DC Gearbox Motors(also known as 'TT' motors) that are usually found in two-wheel-drive robots. They are rated for 3 to 12V. So, we will connect external 12V power supply to the VCC terminal.What is the function of H bridge?An H-bridge is an electronic circuit that switches the polarity of a voltage applied to a load. These circuits are often used in robotics and other applications to allow DC motors to run forwards or backwards.What is the difference between l293d and l298n?L293 is quadruple half-H driver while L298 is dual full-H driver, i.e, in L293 all four input- output lines are independent while in L298, a half H driver cannot be used independently, only full H driver has to be used. ... Hence, heat sink is provided in L298.