This automotive circuit was found in the September 1992 issue of Radio Electronics magazine. The circuit directly drives a relay that must have a coil resistance greater than 65 ohms.
Found in a European magazine from the 90s, this circuit emits beeps that are several seconds apart to...
This is a battery powered 3W power amplifier using germanium transistors. The circuit is from an...
This circuit was found in Raytheon's 1967 documentation. The circuit uses an operating of the era,...