Category: op amp

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Dark sensor circuit using LDR

Automatic Light Switch using Transistor This circuit adjusts the output light with respect to the ambient light intensity. That is as the incident light from the surroundings reduces, it automatically increases the brightness of the LED. Similarly,...

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Tone generator circuit using op amp

Here a circuit for a tone generator using an op amp. Here the op amp astable multivibrator circuit generates a square wave signal around 3KHZ  frequency. The output current which can deliver by a 741...

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Voltage doubler circuit DC to DC

Here the circuit for a voltage doubler using an Op-amp IC, which can deliver double the voltage of supply voltage. Here we are using an op amp  IC 741, which has connected as an astable...

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Continuity tester circuit with buzzer

Here the circuit for a simple audible continuity tester with a buzzer. A continuity tester indicates whether a wire, cable or circuit is electrically closed or not between two test points. The circuit considers...