This high-powered battery powered flasher was found in General Electric documentation from the 1980s. The circuit can control loads up to 3 A and has a sensor that triggers it in the absence of light.
This circuit uses a Hall device from that time as a sensor. The circuit is from an English...
Found in Radio Electronics from the 90s, this siren finds many variations on this site. The...
This audio generator that produces both rectangular and sinusoidal signals was found in a...