Micropower VCO (Voltage-Controlled Oscillator)

This is a schematic diagram of a micropower voltage-controlled oscillator circuit. This circuit can generate square and triangle wave outputs and only need 50µA from a single 5 V supply. This circuit consist of combination of an  inexpensive quad CMOS switch and two OP90s. Here is schematic diagram of the  the circuit : The integrator in this circuit is A1. […]

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Simple Metronome With Transistors

Flip-flop, as an astable multivibrator, can be used to generate timing signal in music: metronome. By adjusting transistor bias resistor using a 100k potentiometer, the charging and discharging time of capacitors can be adjusted to get  proper tick period for the metronome. Here is the schematic diagram of this simple metronome circuit. This metronome circuit can be put in a […]

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Sine Wave Oscillator

This is a Sine Wave Oscillator circuit. This circuit as known as  amplitude-stabilized sine-wave oscillator. It can gives high purity sine-wave output down to low frequencies with minimum circuit complexity. This circuit has a several advantages such as it does not use the traditional tungsten filament lamp amplitude regulator, so the problem problems associated with a lamp such  as linearity […]

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