With this circuit you can produce the sound effect passing from one channel to another. The circuit is from Mullard documentation from the 1960s. The transistors may be the BC548.
This circuit has a logarithmic response as a function of the light falling on the sensor. The...
This circuit was found in documentation from the 70s. The transistors are from that time, but the...
The idea is simple: using a flashlight to cut your TV commercials triggers a relay that turns off...