This automatic switch for multiple loads was shown in the May 1983 issue of Radio Electronics magazine. The circuit is designed to switch multiple electronic devices at the same time.
If the battery is good, the LED flashes. This simple tester uses an LM3909 integrated circuit. We found...
This circuit is from an old publication by A. Fanzeres. To use a unit, it is sometimes necessary to...
An interesting type of sensor for specific applications is the sensor formed by piezoelectric...