Using a 4046 PLL, which is uncommon today, this circuit was found in the October 1994 issue of Electronics Now magazine. The circuit can be modified by changing the capacitor.
We found this circuit in a 1985 documentation. The 4-LED bargraph is excited by an input voltage. The...
This circuit was found in Ferranti's 1967 documentation. The circuit drives a 40 V relay, but it can...
We found this circuit with PUT in an American publication from the 1980s. PUT is not a common...