This 50% active cycle TTL clock generates signals from 4 to 20 Hz. Its power must be supplied with 5 V and other frequencies can be generated with capacitor replacement.
This is a typical symmetrical power supply configuration. The transformer voltage determines the...
This circuit turns on your car's backlight when a vehicle coming from behind gets too close to it...
This circuit was found in Popular Electronics from 1969. The circuit uses a small speaker as a...