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 was found in documentation from the 80s. It is based on unijunction transistors not...
This circuit was found in the May 1982 issue of Radio Electronics magazine. The circuit inverts the...
This alarm is designed for doors and windows, but nothing prevents it from being used in cars,...