This circuit was obtained from the July 1970 issue of Radio Electronics magazine. Zeners are power types that can provide a good current to the circuit. Selection is made by rotary switch.
This circuit, found in a 1985 documentation, causes two incandescent lamps to flash alternately. The...
This circuit produces signals in the range of 200 Hz to 2 kHz. We found it in the magazine...
This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old...