This circuit is placed between the instrument pickup and the amplifier input. The same version can be found from other sources in this section. This is from an English magazine from the 80s.
We found this configuration in a Radio Shack documentation from 1977. Here we have the way to...
This circuit was found in a 1987 magazine. It measures the pulse rate produced by a cardiac...
Tone controls for audio applications can also be considered filters that must attenuate certain...