Published in a February 1978 Radio Electronics magazine article, this digital circuit uses some of the integrated circuits of the time. The circuit uses a LED bargraph.
This voltage regulator step can be used for a variable source from 0 to 30 V with a maximum output...
This circuit was found in Popular Electronics from February 1967. Transistors are from the period....
In this oscillator circuit using 3 TTL inverters we have all the conditions for the frequency...