This vibrato circuit was found in Motorola's 1966 documentation. The circuit uses transistors of the time that can be replaced with current common types. Power is done with 3 9V batteries.
This traditional circuit is from a 1972 RCA technical publication. The circuit can be developed with...
This well-known siren configuration using complementary transistors is from a 1980s documentation. The...
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...