Free Simple Circuit Diagram
VCO (voltage controlled oscillator) is an electronic signal generator which produce a signal that has variable frequency depends on a voltage level at its control input. Many VCO circuits are based on ramp generator to produce a variable frequency output, but they produce a square wave signal. With varactor (voltage controlled variable capacitor), we can produce a high quality sine […]
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A flip-flop that generates two unstable states (high-low) is called astable multivibrator, a fancy name for you to say it’s an oscillator. The very basic of such circuit consist of two transistor where the collector of each transistor is wired in such way they try to short the base of the other transistor through a capacitor. At the beginning of […]
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This is an AC motor brake circuit. This circuit is used to make the motor stop/decelerate faster (braking), more than just cutting the power of the ac power tool motor. Here is the schematic diagram of the circuit: The braking mechanism is done by a diode and switch S1. When this switch is on, the motor will be fed by […]
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This is a 28VDC to 5VDC switching converter circuit. As a switch-mode voltage regulator, this circuit gives higher efficiency than linear regulator type. Using the National Semiconductor LM1575-5.0, this circuit can be used to convert 28VDC To 5VDC with efficiency of >80%. This circuit can be used as a 5V source @ 1A. Here is the schematic diagram of the […]
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