Found in a 1965 Electronic Design, this circuit makes it possible to select signals with an inverted phase using a relay and a unit gain stage.
This circuit was found in a 1977 Signetics manual. The 556 consists of a 555 double and the...
One of the first transistor amplifiers with transformerless output but using a 45-ohm speaker. This...
With this simple converter found in a 1997 documentation, it is possible to tune VHF stations to a...