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 an American 80's documentation. However, it can be implemented with...
Suggested by Popular Electronics, it is a digital amplifier, for pulses with frequencies up to a...
This circuit for analog video signals was found in a March 1988 Radio Electronics. The Maxim...