Voltage to Frequency Converter Using UJT

The following voltage to frequency converter (V/FC – VCO) circuit consist of a UJT (uni-junction transistor) oscillator in which the timing charge capacitor C2 is linearly depends on the input signal voltage. The voltage across resistor R5 set the charging current, which is accurately controlled by the amplifier. Here is the schematic diagram of the circuit:

VOLTAGE TO FREQUENCY CONVERTER 1 circuit schematic diagram

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