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.
The original purpose of this 1963’ circuit from a magazine is to replace the mechanical vibrators used...
The two integrated circuits used in this configuration can still be found. The frequencies of the...
This circuit, found in an American publication from the 1970s, produces an audible tone in a...