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.
In the figure we have a way of receiving ultrasonic signals of a single frequency using a PLL 567....
The HA2620 integrated circuit used in this comparator is from the 80's, but the setting can be...
The UM3562 integrated circuit (not very easy to find) synthesizes three types of sound that...