This traditional signal injector configuration was obtained in a 1977 amateur radio manual. The frequency is given by the capacitors and the supply can be made with 1.5 or 3 V.
This circuit shows how to use the remaining gates of a 4093 or 74C14 as amplifiers. The circuit has...
Suggested by a 90s Electronic Design, this circuit drains only 0.25 mA from its source. Listening...
This circuit can be embedded in switches and sockets, thus facilitating its location in the dark....