Integrated signal generator appeared in Radio Electronics magazine in January 1968. The integrated circuits are from the time and the generator produces signals from 5 Hz to 50 kHz.
This crystal radio or galena was found in an English documentation from the 70's. The diode must...
We found this circuit in a 2002 documentation. What it does is put in a reduced power outlet for...
This circuit was found in a 1988 publication. The circuit is an alarm with interrupt sensors that...