This circuit was found in the February 1980 issue of Radio Electronics magazine. The digital circuit was shown in two parts, using 20 LEDs in a configuration with the LM3914.
This useful circuit is used to test the insulation of cables, appliances, leaks in high voltage...
The 5 outputs of the internal 4018 integrated flop flops can be used simultaneously for the...
This small transmitter for telegraphy (CW) or remote control operates at the frequency determined by the...