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 circuit for a 16-channel infrared transmitter was found in the August 1984 issue of Radio...
We found this circuit loader in a French magazine Electronique Radio Plans from July 1993. The...
This charger is from an old publication of 1975. The PNP transistor can be the BC558 and the NPN...