OPAMP Project List

  1. Battery Charger Circuit Using SCR
    A tiny amount of AC or DC voltage is used to charge the Battery Charger. So, if you want to charge your battery using an AC source, you must first…
  2. Cell Phone Detector Circuit
    Cell Phone Detector often known as mobile phones are the most commonly used electronic devices nowadays. The demand for cell phones has risen tremendously as communication technology has advanced. A…
  3. 100W Subwoofer Amplifier Circuit
    A subwoofer is a loudspeaker that delivers low-frequency audio signals. Ken Kreisler invented the first subwoofer amplifier in 1970. Its primary purpose is to enhance the bass quality of audio…
  4. Low Power Audio Amplifier using 555 Timer
    For spaces such as an auditorium or any other hall, traditional audio amplifier methods use high-power circuits to drive a loudspeaker. However, we can meet the requirements for applications involving…
  5. Log amplifier Schematic Circuit Diagram
    Log amplifier is a linear circuit in which the output voltage will be a constant time the natural logarithm of the input. The basic output equation of a log amplifier…
  6. Sound Level Indicator Schematic Circuit Diagram
    This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided…
  7. SOLAR PANEL ROUTER AND DC-DC WELDED REGULATOR SCHEMATIC CIRCUIT DIAGRAM
    Our forum section i basriacar ular is a very nice sharing and a sample project for people who are interested in solar energy topic in the forum kon Switched Power Supplies ı are…
  8. CURRENT MEASUREMENT
    In many applications it is the current that requires another measurement, such as measuring voltage. Before mentioning the current measurement, it is appropriate to define briefly what the current is. Current: The…
  9. VOLTAJ REGÜLATÖRLERİ ve UPS – Üretici Firma UYGUN FİYATLAR
    I found 2 power supply diagrams when mixing my archive. well-prepared, especially for beginners in electronics, easy-to-understand instructions, simple descriptions of circuits, layout drawings. Adjusted symmetrical power supply by HAYDAR AKIN ANADOLU…
  10. DESIGN PROJECT!
    There are two linear regulators in the bag of most people dealing with hobby electronics: LM317. One opamp (LM318) and plenty of resistance, capacitor and so on. Let us ask this; Let us…
  11. SIMPLE POWER SUPPLIES WITH LM337 AND LM317 SCHEMATIC CIRCUIT DIAGRAM
    I found 2 power supply diagrams when mixing my archive. well-prepared, especially for beginners in electronics, easy-to-understand instructions, simple descriptions of circuits, layout drawings. Adjusted symmetrical power supply by HAYDAR AKIN ANADOLU…
  12. DESIGN PROJECT SCHEMATIC CIRCUIT DIAGRAM
    There are two linear regulators in the bag of most people dealing with hobby electronics: LM317. One opamp (LM318) and plenty of resistance, capacitor and so on. Let us ask this; Let us…
  13. 12V DARK SWITCH WITH 741 OP AMP Schematic Circuit Diagram
    It works as a dark key with the LDR that you see in the diagram . The circuit consists of four resistors, one opamp, two potentiometers, one LDR, one switching transistor and one lamp. In the circuit,…
  14. QUALITY DISTORTION OVERDRIVE EFFECT CIRCUITRY NE5532 SCHEMATIC CIRCUIT DIAGRAM
    Overdrive Distortion Effect Circuit Designed specifically for use with guitar. Circuit NE5532 There is no critical material on the opamp installed circuit. All of them can be found on the market. Also…
  15. AUDIO TRANSMISSION WITH FIBER OPTIC CABLE SCHEMATIC CIRCUIT DIAGRAM
    Operation Principle of the Transmitter Circuit: In this circuit a capacitive microphone is used to convert the audio signal into an electrical signal. The signal at the mV levels at the microphone…
  16. LM3886 STEREO COMPLEX ANFI PROJECT SCHEMATIC CIRCUIT DIAGRAM
    The LM3886 Anfi integration is very popular and I have made a special design. First of all there are differences between photos and pcb, some because of the material values…
  17. AMPLIFIER POWER SUPPLY AND PROTECTION CIRCUITS Schematic Circuit Diagram
    Power supply circuits that you can use in various power circuits such as an amphibious, preamplified, etc. circuits are available in low power designs as well as high power ones. Generally PCB…
  18. Tester for Inductive Sensors Schematic Circuit Diagram
    This tester uses a LED to indicate whether an inductive sensor is generating a signal. It can be used to test the inductive sensors used in ABS and EBS systems…
  19. Audio Source Enhancer Schematic Circuit Diagram
    Vinyl or CD: which has the better sound? It’s a question still hotly debated among audiophiles everywhere. We will try to shed a little light on what lies behind the…
  20. Lead Acid Battery Protector Schematic Circuit Diagram
    The circuit described here can be used to ensure that a 12 V sealed lead acid (SLA) gel battery isn’t discharged too deeply. The principal part of the circuit is…
  21. VGA Background Lighting Schematic Circuit Diagram
    More and more people are using a PC (conventional or notebook) to view films. The VGA output can be used to provide a matching ‘Ambilight’ effect for this. If you restrict…
  22. Stepper Motor Controller Schematic Circuit Diagram
    Stepper motors are available in several versions and sizes with a variety of operating voltages. The advantage of this general-purpose controller is that is can be used with a wide…
  23. Efficient Current Source for High-power LEDs Schematic Circuit Diagram
    To get the maximum brightness and working life out of a high-power LED, it needs to be driven at the optimum specified current. Allowing the current to exceed the permitted…
  24. Converting a DCM Motor Schematic Circuit Diagram
    We recently bought a train set made by a renowned company and just couldn’t resist looking inside the locomotive. Although it did have an electronic decoder, the DCM motor was…
  25. Programmable- Gain Amplifier Schematic Circuit Diagram
    The gain of an operational amplifier is usually set using two external resistors. If you wish to have adjustable gain, you can use a digitally controlled multiplexer to select several…
  26. Luxury Car Interior Light Schematic Circuit Diagram
    This circuit belongs to the ‘car modding’ category. This is similar to the popular case modding in the computer world and has found its way into a substantial proportion of…
  27. Triple Power Supply Schematic Circuit Diagram
    Inexpensive miniature transformers normally provide one or two secondary voltages, which is sufficient for generating a set of positive and negative supply voltages, such as are needed for operational amplifier…
  28. Adjustable Zener Diode Schematic Circuit Diagram
    A Zener diode is the simplest known type of voltage limiter (Figure 1) As soon as the voltage exceeds the rated voltage of the Zener diode, a current can flow…
  29. Monitor Life Xtender Schematic Circuit Diagram
    This circuit was designed to protect a computer monitor from overheating. It is recommended to attach this circuit to power users’ monitors! Most computer monitors of the CRT type fail…
  30. Low-cost Position Sensor Schematic Circuit Diagram
    Ever wanted to build a positioning encoder? Here’s one and you do not even need any sensors. The circuit uses an LED as a light emitter and another LED as…
  31. Overvoltage Protection Schematic Circuit Diagram
    This is a tried and trusted design for the protection against overvoltages that can be configured for your own needs. The circuit can also be used to detect under voltages;…
  32. AM modulator for Intercom Schematic Circuit Diagram
    This circuit was originally designed as a simple mains intercom for use in the home. To complete the circuit you could use the ‘Mains Remote Transmitter’. We have to admit…
  33. AM Demodulator for Intercom Schematic Circuit Diagram
    This circuit should be considered as more of an experimental circuit for AM demodulation, than as a practical application. In the associated ‘AM modulator’ we have raised the problems caused…
  34. Mains Remote Transmitter Schematic Circuit Diagram
    This circuit can be used to superimpose a 143-kHz carrier on the mains voltage, which allows various applications to be realized.  One example is the ‘Mains  Remote Switch’. Besides the…
  35. Wideband Wien Oscillator 4 Amps Photovoltaic Charge Controller Schematic Circuit Diagram
    This Wien bridge oscillator (after Max Wien, 1866– 1938) produces a low-distortion sine wave of constant amplitude, from about 15 Hz to 150 kHz. It requires just four opamps and…
  36. Universal Measurement Amplifier/Attenuator Schematic Circuit Diagram
    A computer is very suitable for making (audio) measurements thanks to the sound card that is usually built in. Unfortunately, the audio input on laptops is usually too sensitive to…
  37. DC Protection for Speakers Schematic Circuit Diagram
    I’m in the process of building myself a single-ended class A MOSFET amplifier consisting of two monoblocks, and I don’t want to use a coupling capacitor between the amplifier and…
  38. Electric Guitar Preamp, Mixer and Line Driver Schematic Circuit Diagram
    Depending on its design an electric guitar may have anything from one to six pickup elements. Classic (acoustic) guitars could also benefit from one or more retrofitted pickups. Each pickup…
  39. Laser Level Detector Schematic Circuit Diagram
    Rotating laser levels, which are very handy for setting objects in a room or garden at the same height, are available at prices of a few dozen pounds. At relatively…
  40. Constant Current Source Schematic Circuit Diagram
    The simplest way to make an adjustable constant current source is to use a voltage regulator in a suitable configuration: an example of what is needed is given in the…
  41. Variable Voltage Injector Schematic Circuit Diagram
    When testing circuits and fault finding there is often a need to inject a defined DC voltage level at some point on the circuit. It may, for example, be necessary to…
  42. Experimental Hall Sensor Schematic Circuit Diagram
    Hall sensors can of course be purchased but making them yourself is far more interesting (and satisfying)! According to the theory the crucial thing is to use a touch layer…
  43. Battery Charge Monitor Schematic Circuit Diagram
    The circuit described here provides monitoring of the charge status of a battery by the continuous measurement of charge and discharge currents. The battery current is integrated over time (respecting…
  44. Glass Blower Schematic Circuit Diagram
    Most guitar pedals obtain a high input impedance simply by using a large resistor at the input of the first opamp, but this generates a good deal of noise due…
  45. Voltage Difference Magnifier Schematic Circuit Diagram
    This circuit was designed for monitoring the charge- and discharge process of a 6-V lead-acid battery. This process takes place between 6.2 V and 6.8 V. The author used a…
  46. 3-Pin Fan in 4-Pin Socket Schematic Circuit Diagram
    The most recent PC motherboards provide four-pin connectors for cooling fans, especially for the CPU fan. The older three pin fans are controlled by varying their DC voltage. The fourth…
  47. Solar Cell Battery Charger/Monitor Schematic Circuit Diagram
    During the past year, the author has built a standalone solar panel system, which included the construction of the panels themselves. Such a system stores the generated energy in a…
  48. Petrol/Diesel Level Sensor Schematic Circuit Diagram
    This sensor is particularly suitable for use in small spaces, such as the petrol tank of a motorbike. It has the advantage of not having any moving parts, unlike a…
  49. Remote-controlled Preamp with Digital Pot Schematic Circuit Diagram
    This circuit is a simple but high-quality preamplifier using a DS1882 digital potentiometer, a device specially designed for audio applications. The potentiometer is controlled over an I2C interface by an R8C/13…
  50. Squarewave Oscillator Using TLC073 Schematic Circuit Diagram
    The square wave generator is defined as an oscillator that gives the output without any input, any input in the sense we should give input within zero seconds which means it…
  51. Active PC Loudspeaker Schematic Circuit Diagram
    With the well-known TDA2030V integrated power amplifier in the Pentawatt package, it is easy to ‘activate’ a PC loudspeaker or upgrade the quality of an inexpensive active loudspeaker. The TDA2030…
  52. Switching Amplifier for Analogue Signals Schematic Circuit Diagram
    If analogue signals have to be switched, a bilateral switch such as the 4066 is often utilized. Because this IC can be powered from single-ended supply only, all the associated…
  53. Li-Ion Protection Circuit Schematic Circuit Diagram
    When a lithium-ion battery is discharged below the minimum recommended cell voltage its life expectancy is dramatically reduced. The circuit described here can avoid this by disconnecting the load from…
  54. Pressure Switch Schematic Circuit Diagram
    A simple pressure switch with a range of 50 to 350 bar can be made using a pressure sensor. If you can accept somewhat reduced linearity, the sensor can even…
  55. Video Correction for Pinnacle Studio MP10 Schematic Circuit Diagram
    T. Giesberts The Pinnacle Studio MP10 is an external real-time MPEG1 codec that includes composite video input and output. The output provides only 0.7 V, which is too low for…
  56. High-Side Current Measurements Schematic Circuit Diagram
    It’s always a bit difficult to measure the current in the positive lead of a power supply, such as a battery charger. Fortunately, special ICs have been developed for this…
  57. Noise Injector Schematic Circuit Diagram
    This circuit is primarily intended to be used by persons who want to experiment with audio. For example, you can determine whether your own audible threshold for noise is different…
  58. ECG amplifier circuit using ic 741 Schematic Circuit Diagram
    Instrumentation amplifier using an opamp An instrumentation amplifier is a kind of differential amplifier with additional input buffer stages. The addition of input buffer stages makes it easy to match…
  59. PCB drill control
    The design presented PCB enables the PCB drill to be controlled with only one preset. as an aside. the rotary direction of the drill may be reversed. When the preset…
  60. General purpose Schmitt trigger
    The thresholds voltages, and thus 21 7 1 the hysteresis, of the Schmitt trigger described can be set independently. The circuit is based on opamp 1C1, which has been connected…
  61. Low-drop diode
    At high currents, many silicon diode has a forward voltage of 1 V or more. There are types whose drop at currents of up to 2-3 A is limited to…
  62. Bias compensation for opamps
    One advantage bipolar opamps have over FET types is that their input noise level is appreciably lower. However, when a bipolar opamp is used in a high-impedance circuit. its bias…
  63. Halogen lamp protector
    Halogen lamps, particularly high wattage ones, tend to draw very high currents when they are cold because they then have a very low resistance: of the order of 0.1 Ω or…
  64. Car battery monitor
    THE charge-discharge-idle (C-D-I) monitor described here is suitable for all vehicles with a 12- V or 24-V battery of which the negative terminal is connected to the chassis (point B…
  65. Fault signalling circuit
    Fault signalling circuit: The present circuit was developed to make it possible for different sensors to be added to an existing alarm installation. These sensors may be gas or smoke…
  66. Triangular-signal generator
    Pulse duration modulators 19%; a perfect triangular signal, that is, one that is absolutely symmetrical with straight sides. Any deviation from this results in distortion. The design is the usual…
  67. Noise generator
    A noise generator is a circuit that produces electrical noise (i.e., a random signal). Noise generators are used to test signals for measuring noise figures, frequency responses, and other parameters. Noise…
  68. Relative humidity sensor
    The Type NH-02 humidity sensor from Figaro consists of a capacitive humidity sensor, Zs. in series with a thermistor.Z, on an aluminum substrate. The parameters of the thermistor ensure that…
  69. Video data change detector
    The circuit detects a change in video information and uses this to switch on an alarm in a closed-circuit television guard system or a video recorder. The circuit is usable…
  70. S-meter for short-wave receivers
    Some radio amateurs are very keen on accurate RST reports, others (mostly the VHF/UHF fraternity) never look at the S-meter on the receiver, and are satisfied as long as they…
  71. Field-strength meter
    Field-strength meter: The unit discussed here indicates, by means of a chain of LEDs, in logarithmetic ratios the strength of an electric field surrounding the unit. The inputs signal across…
  72. Automatic battery charger 1
    The charger described switches off the charging voltage when the battery reaches its full nominal voltage and switches it on again when the battery voltage drops below a predetermined level.…
  73. Compact A-D converter
    Although good and inexpensive integrated analogue to digital (A-D) converters are now readily available, it may be instructive to build one from discrete components. The present converter is based on…
  74. Peak level indicator
    The peak level is the instantaneous measurement of the level. It's important because it lets us know the highest level of the audio and how close it is to the…
  75. 3 Watt PWM stereo amplifier
    The most remarkable feature of this small stereo amplifier is the use of a stepper motor bridge driver IC as a stereo power output stage. The circuit diagram shows a…
  76. Voice operated recording
    Voice operated recording (VOR) is 411 a feature found on most handheld memo-recorders. The function of the VOR control is to start the recorder's tape on detection of a speech…
  77. Compressor or limiter
    A compressor has a low ratio that turns down SOME of the volumes when it goes above the threshold. A limiter has a huge ratio that turns down ALL of the volumes…
  78. Low-noise amplifier 2
    One of the available choices in the ' design of a low-noise amplifier is the shunting of several input stages. This reduces the overall noise, Un = Uin-1/2, where un…
  79. Low-noise amplifier 1
    A low-noise amplifier (LNA) is commonly found in all receivers. Its role is to boost the received signal to a sufficient level above the noise floor so that it can…
  80. Digital volume control
    Digital volume control, Two ladder networks and a buffer each from a volume control with a range of 63 dB. Network R3-R17 provides fine control in steps of 1 dB,…
  81. 40 W output amplifier
    Output amplifier, Although there are a number of hybrid output modules on the market, very few of them combine compactness with reasonable price and good performance. One of these few is…
  82. Stereo protector against d.c.
    Stereo protector , If a d.c. coupled output amplifier breaks down during operation, the loudspeakers, particularly the bass units, are at risk. The bass particularly so is not decoupled for…
  83. Overload Indicator
    The overload indicator consists of a window comparator that measures the magnitude of an a.f signal. Two of the opamps contained in a TL072 is supplied with a reference voltage…
  84. Three-phase simulator
    Three-phase power can be defined as the common method of alternating current power generation, transmission, and distribution. It is a type of polyphase system and is the most common method used…
  85. Symmetrical power supply
    A stabilized symmetrical power supply unit is an embedded circuit, or stand-alone unit, the function of which is to supply two complementary stable voltages to a circuit or device that must…
  86. Simple Signal Generator
    A signal generator is one of a class of electronic devices that generates electrical signals with set properties of amplitude, frequency, and wave shape. These generated signals are used as a stimulus for electronic…
  87. Precision Rectifier for Digital Voltmeter(DVM)
    DVM
    The voltmeter is an electrical measuring instrument used to measure the potential difference between two points. The voltage to be measured may be AC or DC. Two types of voltmeters…
  88. Latest mini projects in electronics with circuit diagram
    1. Circuit Diagram Of High Power Audio Amplifier In this tutorial “Circuit Diagram Of High Power Audio Amplifier” you will how to make an audio amplifier which you can utilize…
  89. Measuring Electrolytic Capacitors
    Most capacitance meters have no facility for measuring large electrolytic capacitors. The circuit described here makes it possible for such capacitors to be measured with some degree of accuracy, in…
  90. LED VU Meter
    VU is an abbreviation for volume unit. Thus, a VU meter is a device for measuring the level of SOUND intensity with audio equipment, such as AMPLIFIERs and TAPE RECORDERs.…
  91. Optical squelch
    Many of the less expensive short. Wave receivers have no squelch circuit and continue to emanate noise when no usable signal is coming in. Fortunately, they normally have an LE…
  92. PC fan control Circuit
    It is an unfortunate and well-known fact that most PCs of IBM and compatible type make a lot of noise. which is both undesirable lots of noise in the both…
  93. 40 W output amplifier
    Although there are a number of hybrid output modules on the market, very few of them combine compactness with reasonable price and good performance. one of these few is SGS's…
  94. 4th order single chip filter
    High-order filters are normally designed by using two or more 2nd-order sections in series. That means that a 4th-order filter needs at least two opamps. The present filter, however, uses…
  95. Scanner for Preamplifier
    The scanner is an extension for 0 1 1 the 'All-solid-state preamplifier' published in Elektor Electronics* As its name implies, it scans all inputs of the preamplifier to ascertain where…
  96. Water Level Control
    In some countries, the water supply Ad is irregular at most times; in many other countries only during a drought. A means of making this less inconvenient is offered by…
  97. Wien Bridge with asymmetrical power supply
    Normally, a Wien bridge oscillator contains two identical capacitors and two identical (variable) resistors. That being the case, the transfer factor of the bridge in Fig. 1 is 1:3. For…
  98. Fast Active Rectifier Circuit Diagram
    Purpose of Fast Active Rectifier: The fast active rectifier is intended to improve the bandwidth of most digital multi-meters. It is based on a half-wave rectifier in a traditional set-up.…
  99. Solar Cell Power Supply System Circuit Diagram
    The simplest solar cell power supply system consists of three parts; a diode, a solar cell panel, and a rechargeable battery. The diode prevents the battery from being discharged through…
  100. Auto Power off for Audio Equipment Circuit Diagram
    This small circuit switch off the equipment in the audio rack when sound has not produced for some time. The circuit is actuated by pressing S1 which causes the capacitor…
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