This circuit was suggested by Motorola in a 1969 publication. It makes use of components of the time, but both the FET and the bipolar may be general purpose current types.
We found this circuit for vocal effects in the September 1990 issue of Radio Electronics magazine. The...
This circuit was found in a 80’s American documentation. The adjustment trimpot is from 47k to...
This circuit produces a single pulse whose duration depends on the capacitor. The circuit is from an...