This circuit was found in the September 1999 issue of Electronics Now magazine. The circuit is based on common operational circuits and produces various effects for the sound of guitars.
This circuit from an old Motorola manual uses an integrated circuit that is no longer easily...
This step was found in the 1960 Mullard transistor reference manual. The transistor can be a BC558...
This circuit is from the Philips Databook of 1990. The circuit has an input resistance of 60k ohms...