Found in a 70s documentation, this circuit uses integrated circuits of the time, without further information about its operating conditions.
This filter for receiving audio in telegraphy was found in a magazine 73 for radio amateurs, in an...
Found in a 1964 Electronic Design, this circuit generates pulses based on an avalanche diode of...
) Found in a 90s Linear Technology documentation, this circuit is a fading of video signals and...