This simple latching alarm circuit using CMOS gates was found in the May 1990 Radio Electronics magazine. The supply voltage is dependent on the relay.
This old two-stage video amplifier uses integrated circuits that are not easily obtainable today. The...
Found in a 1967 Delco documentation, this circuit can deliver power from 40 to 50 W at 8-ohm load....
Found in a Popular Electronics from the 90s, this circuit transforms an ordinary oscilloscope into a...