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.
We found this ladder-shaped signal generator circuit in Radio Electronics magazine from August 1966....
This powerful regulator, shown in the figure is for 5V (TTL) is suggested by Motorola and makes use...
The L3 coil is what basically determines the resonant frequency, around 1 MHz, in this oscillator found...