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This circuit is 6-band graphic equalizer, you can adjust the sound of low, medium and higher than the IC op amp circuit used 741. With this circuit you can control and mix of frequencies and tones to your liking. Audiblefrequency spectrum is covered in six....
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The purpose of this digital electronics project is to record messages using a dedicated voice recorder integrated circuit. Recordings are stored in a non volatile memory cells, which means that the message will still be saved even though power has been....
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The CMX867A is a multi-standard modem for use in telephone based information and telemetry systems. Control of the device is via a simple high speed serial bus, compatible with most types of C serial Interface The data transmitted and received by the modem....
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This is a very-very simple mini audio amplifier circuit. The circuit build based single LM383 with several discrete circuit to support LM383. The circuit capable to deliver about 7W audio output. The circuit could be built on a perf board, universal solder....
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Originally Posted by Electrotek so is something missing or not? This is what I`m trying to find out. I think you are missing some of the external....
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This project is inspired by the DPRG IRPROX project. They have a pretty good PCB layout and idea. I would like to thank them for posting their project for all of us to see and learn from, I wouldn`t have started PIC programming without them, or at least not....
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This circuit can switch two or more devices on and off in response to a series of rapid handclaps. The claps are picked up by an electret microphone and amplified by a 741 op amp (IC1). IC1 is configured as an inverting amplifier, with its gain and hence the....
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Hi Parallax people, just joined the forum. I`m trying to control a CPU fan with a relay triggered by a stretch sensor. I have my circuit set up like this. Right now the stretch sensor isn`t attached, however when I power the circuit it just pulses like in....
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This is a simple design schematic circuit for phase control circuit. The circuit can be used to control the power delivered to an AC load. The phase control circuit can control the AC waveform, cutting the cycle to give full cycle, half cycle, zero cycle, or....
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The following circuit shows about Wiring Diagram and Electrical Circuit Troubleshooting Of 1997 Chevrolet Blazer. Features: powered by a 4. 3-liter Vortec V-6 engine, AM-FM stereo radio with CD, rear wheels moved through a four-speed automatic gearbox, air....
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This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....
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This circuit uses a conventional spring loaded mouse trap, available from hardware stores. However when a mouse is caught, the circuit triggers and transmits an interrupted tone on the commercial FM band to a nearby radio receiver. This circuit is a small....
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This small circuit is ideal for checking the basic operation of an infrared remote control unit. The circuit is based on the brilliantly simple idea of connecting a piezo buzzer directly to an IR receiver IC. This method is almost as simple as connecting a....
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An amplifier to go with an antique Meissner AM High Fidelity tuner that I had restored. But by the time the amp was finished it sounded so good that it has become my amp of choice for listening to CDs while working in the shop. The only parts purchased new....
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Just about any power transistor can be used in this megaphone. Its suitable for boats, playing fields etc. the transistors Q1 & Q2 are the HEP-230 type which are easily available in the market. The transistors are parallely connected to handle the required....
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Add a cheap stopwatch to this circuit to produce an accurate reaction timer. The circuit is wired in parallel with the start/stop button in the watch via a 2. 5mm socket, which fits snugly in one corner of the casing. The person conducting the test (the....
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The TDA3567 is a monolithic integrated decoder for the NTSC colour Television standards. It combines all functions required for the demodulation of NTSC signals. Further more it contains a luminance Amplifier an RGB-matrix and Amplifier These Amplifiers....
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It is not the purpose of this folio to accommodate a abundant account of the IC`s acclimated by this circuit. If you appetite added advice on this accountable amuse accredit to the Flip-Flop Made With A LM556 Timer Chip folio in the assorted circuits area of....
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In appliance that appeal for aerial current, Nicad (NiCd) rechargeable array still has the angry achievement compared to NiMH and Lithium battery. The charger ambit actuality is acute in the way it handle the amiss polarity of the array placement. The core....
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A "talking" computer is not necessarily expensive - not if you mate one of the low-cost computers (Sinclair ZX-80, ZX-81, or Timex 1000) with Texas Instruments popularly priced "Speak & Spell" learning device. The combination give you several hundred clearly....
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The high durability nature of a light emitting diode (LED) make it suitable for ON/OFF indicator application. Because the limitation on low operating voltage,...
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With a few basic hand tools and a digital camera, this programmable camera controller project is for you. By using components already available at home, costs may be kept to a minimum. A servomotor may be reused from a radio-controlled model and aluminium....
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Hi folks. I`m new to the forum and relatively new to diy electronics. My current project involves trying to make a battery-powered LED dimmer circuit. ....
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Using an AMI chip P/N S2561, this telephone ringer can be powered line. Audio output is about 50 mW when powered from a 10-V source....
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In the first, voltage from AC 220V or 110V entered to the transformer and will be lowered into 12V AC. And then AC voltage will be rectified by 4 diode or you can use bridge diode to the DC voltage. And the DC voltage output will be filtered by Condesator....
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This circuit controls a Searchlight type signal head and produces solid - RED, YELLOW or GREEN indications. The signals can be connected for NORMAL or APPROACH type lighting of the Green signal. The circuit uses a LM556 - Dual Timer IC in a complimentary....
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This simple alarm circuit was designed for use in a combined garage and rumpus room. It can be assembled on Veroboard and uses just one IC plus a handful of cheap components. The circuit is based on a straightforward 555 timer circuit (IC1). This is wired as....
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Hi Guys, Relatively new electronics newbie here - so thanks for your help Recently I purchased several electromechanical seven segment vane displays....
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Jumping ahead just a little The YouTube video below illustrates how quickly and easily the system is set up at the launch site My to....
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This battery level indicator offers (5) LEDs that light up progressively as the voltage increases: Red: Power Connected (0%) Yellow: Greater than 10.5V (25....