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Square wave frequency to voltage converter

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sudil99

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how can I convert square wave frequency (of around 20kHz) to voltage without using F-V converter ICs or MCU ?
 

There is a method called a charge bucket. Each pulse adds a little bit of charge on a capacitor.

The more rapidly the pulses arrive, the more the charge builds. A resistor is in parallel, to make the charge reach an equilibrium state.

The pulses must be equal in length. I believe your signal must go through a one-shot, to generate identical pulses.

I've seen it used in a project for an automotive tachometer. It does the same job as a F-V converter.
 

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