This circuit is from a 1992 publication and is based on CMOS technology. The circuit is powered by a 6 V source and the displays are of common cathode.
We found this circuit in a Popular Electronics from the 80s. It is a game of reaction speed for 3...
The integrated circuits used in this 1989 project are uncommon today, including the IF coil that...
This circuit is used to detect the water level in a reservoir. It triggers the charge when the...