Found in a 1967 Delco documentation, this circuit can deliver power from 40 to 50 W at 8-ohm load. The response ranges from 20 to 20 000 Hz. No information is given about the transformer used.
The circuit shown is a documentation on 80's tunnel diodes. The frequency depends on the delay line...
This bistable circuit that drives a relay with a pushbutton was found in the March 1pp6 issue of...
Found in a 1980s telecommunications documentation, this balanced modulator circuit uses...