Free electronic circuit design and schematic diagram
This is a 22-W Amplifier circuit that is designed for or 12-V DC power supply Systems. There are many application for this circuit, such as in car audio application. In car electrical power supply system, the 12V power supply will be provided by the host vehicle’s battery. The capacitor C3 is used to give ripple rejection, since noisy power supply […]
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This is a versatile discrete monostable circuit. This circuit consist of 2N3819 JFET and 2N3704 transistors. This monostable multivibrator circuit has additional input to enable or inhibit the function at any time without causing output pulse. The input of this circuit accept a standard digital IC voltage levels. Here is the schematic diagram of the circuit: The output’s timing cycle […]
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This is a schematic diagram of a pulse width to analog demodulator circuit. This circuit is used to demodulate the pulse width to analog voltage level. With input pulse width range of 0 to 1 microsecond, this circuit can produces Output range of 0 to 10 v. The input pulse is integrated and the final value is held until next […]
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An overvoltage protector circuit is shown in the schematic diagram below. This circuit will work to disconnect the protected device from the power supply when an overvoltage occurs at the supply. This circuit uses a silicon-controlled rectifier (SCR) and normally-closed 12-V relay, K1. The silicon-controlled rectifier is connected in parallel to 12-V line to monitor for the overvoltage condition. This […]
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Retriggerable one shot/monostable multivibrator circuit is a flip-flop circuit which give active output when an input is present, and hold the state for a predetermined period before turns to inactive state. The difference between retriggerable and non-retriggerable is that retriggerable circuit gives period extension when the input is retriggered before the output changes to inactive state. Here the circuit uses […]
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Current to voltage converter circuit can be made using a single resistor, it is very simple since any current will naturally develop a voltage when flow through a resistor. Using an active component, a small developed voltage on a resistor can be accurately measured since we can amplify it to reach a convenient level to be measured. A schematic diagram […]
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This is an interface circuit for digital data input. This circuit consist of touch button, op-amp, diode, capacitor and resistors. Any conductor surface can be used as the touch probe, such as a machine-screw head having comparable area around 0.5-inch-square or similar area of any pattern on printed-circuit board. This circuit need a DC power supply that is produced by […]
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