The purpose of this circuit found in a 1967 GE SCR manual is to control a heating element. The SCR must have current according to the controlled load.
This mechanical reverberator circuit for guitar was found in the February 1970 issue of Radio...
Found in an old English publication this circuit uses a dual gate MOSFET. Coils not specified....
This is the receiver for the previous circuit transmitter. Similarly, no information about the...