We found this circuit in a 1987 documentation. It is a multi-tester with neon lamp and LEDs operating with both low continuous voltage and high alternating voltage.
This simple binary counter triggers two LEDs according to the number of pulses applied to the...
We found this circuit in a November 1970 Radio Electronics. It uses a PUT or programmable...
Found in a 1968 Novel Electronics Circuit, this circuit compares two light intensities using...