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 anti-bounce circuit was found in a 1967 US documentation. Modern transistors such as the...
I found this circuit in an English magazine from 1977, but the circuit can be easily assembled by the...
Found in a 1964 General Electric documentation, this circuit uses PUTs that are not currently...