This circuit is from a 1968 documentation using one of the first integrated circuits available at the time, the TAA370. The circuit is powered by 1.3 V using a 200 ohm handset.
This circuit was obtained from an 80's linear integrated circuits manual. Modern operational...
This basic relay configuration was found in a July 1994 Electronics Now. The relay is supposed to be...
This interesting multivibrator was found in an Italian magazine that no longer exists. This is...