Two operational amplifiers like the 741 or equivalent are used in this voltage-controlled oscillator (Voltage Controlled Oscillator) for frequencies of up to a few kilohertz determined by C. The circuit must be supplied with a symmetrical source of 6 to 12 V and we have two types of signals in the outputs: a triangular waveform at the output of the first operational and a rectangular output at the second operational. The range of input voltages that allows a 1:10 control range in frequency, is between 0 and the positive supply voltage of the circuit.
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