We found this circuit in the December 1968 issue of Radio Electronics magazine. The circuit is used with high-impedance magnetic headphones. The transistors are from that time.
We found this code switch circuit in the January 1999 Electronics Now magazine. Some of the...
We found this circuit for musical instruments in the March 1992 Radio Electronics magazine. The...
This circuit was found in documentation from 1977. Its purpose is to diode-switch the frequency of a VFO....