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.
Found in an EDN from the 80's, this circuit makes use of an operational one of the time. The...
This circuit was found in a 1962 publication. At the time there were high voltage batteries like the...
This circuit was found in a Motorola Manual of 1965. The circuit has neon lamps as trigger...