10 Hz to 10 Khz Voltage Controlled Oscillator

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Voltage-controlled oscillator (VCO)  is an oscillator that its frequency is controlled using a voltage signal.  The VCO described here provide both triangular and square wave output. The control voltage can be varied between 5 mV to 5 V, to produce oscillation frequency from 10 Hz to 10 KHz. Here is the schematic diagram of the circuit:

10 Hz to 10 Khz Voltage Controlled Oscillator circuit schematic diagram

[Source: National Semiconductor Application Note]

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