The circuit works according to a simple principle: a converter has always a mixer and an oscillator. The TBA120 can be used as the mixer. Its amplifier component can then be used as the oscillator by ...

1. The block diagram of the LM331 represents a relaxation oscillator that will change frequency with input voltage. The output is a pulse train, not a square wave; hence the one-shot.

This voltage to frequency converter circuit has an oscillator that is voltage controlled and has a small, 0.5% deviation. IC1 function as a multivibrator and produces rectangular impulses with equal ...