This circuit is from American documentation from the 70s. The circuit makes use of the operating system of the time, but it can be implemented with more modern equivalents.
This two-microphone amplifier was found in a April 1961 Radio Electronics Magazine. The circuit is...
We found this experimental musical instrument in a 1977 Radio Shack brochure. The sound produced...
With this circuit it is possible to modulate the radiation emitted by a laser diode in amplitude. The...