This low frequency circuit was found in documentation from the 1980s. The values of R and C determine the frequency. Inverters can also be designed with logic gates.
This circuit can be interleaved between guitars and guitars to give the fuzz distortion effect. The...
This 1969 Philips documentation circuit makes it possible to control an engine through the sound...
This circuit, suitable for tube equipment, was found in an old documentation. It uses a high...