This circuit was found in a documentation from 1948. There are 5 valves with push-pull output. The source uses a transformer, and the indicated application is with turntables.
We found this version of the siren that makes the American police siren sound in a 1980...
This microphone circuit was found in a collection of American 80's layouts, using operational...
The integrated circuit used in this filter is like to a double 741 and must be powered by a...