This circuit can be used in a signal level indicator with LEDs. The circuit is from an Electronics Now dated January 1996. The power supply must be dual.
This circuit includes a battery charging system and an inverter for operating a fluorescent lamp....
This is one of the many versions of cricket that the reader can find on this site. This circuit is...
This circuit emits a sound when a magnetic field, of a magnet, for example, approaches the sensor....