Hello friend Kostas 87.
Don't forget, this type of circuit has become more selective with the LM567. We left out randomness. The detection range is approximately (19 Hz to 6 kHz) .
I will put together an infrared sensor circuit to illustrate the idea of the variety that can be achieved while maintaining selectivity. With a bandwidth between approximately ( 1% - 25% ) .
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Note:
The diagrams that I design have not been confirmed to work with the 567 because the simulation program I use does not contain the 567, so we recommend trying the circuit on a breadboard first.
