We found this circuit in a Radio Electronics issue from July 1969. The lamp remains on until C1 opens. The time is given by capacitor C1.
This circuit can be used as an input shield by removing the signal directly from the second port,...
This sensitive circuit was found in an Electronics Hobbyists Handbook from the 1990s. The circuit can...
We found this circuit in an 80's documentation. The circuit has a gain of 30 dB and uses a varicap...