We found this circuit in the 1964 RCA transistors manual. The transistors used are uncommon today, but they can be used equivalent. The circuit controls the operation of a heating element.
This reflex receiver for the mid-wave range employs germanium transistors of the time. We found it in...
Using a 106 series SCR, this circuit was found in the May 1971 Radio Electronics magazine. The...
This circuit was found in an old manual of linear integrated circuits of the 80's. Equivalent...