This benchtop power supply with various output voltages from 1.5 to 12 V was found in Radio Electronics magazine from August 1960. The circuit uses power transistors of the time.
Found in American documentation from the 1970s, this circuit employs an integrated circuit from...
This transmitter uses a small loudespeaker (FTE) as microphone and can send the signals to...
We found this circuit in a 1977 publication. With it we can test general purpose operational...