The purpose of this circuit found in the September 1977 issue of Radio Electronics magazine is to produce the vibrato effect. It is a phase shift circuit working with common operating systems.
This circuit is from a 1998 Electronics Now and can be easily assembled since it uses a common...
We find this circuit in an American 80's documentation. No further information about the...
With this circuit, an external circuit can be controlled by turning it on or off and reversing it (if...