This circuit with a few watts of power was found in the April 1995 issue of Electronics Now magazine. The voltage obtained and the efficiency depend greatly on the transformer.
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...