True RMS Voltmeter (CB25353E)

This circuit is from a Radio Electronics magazine from August 1990. The indicator module is of a common type at the time.

| Clique na imagem para ampliar |

TTL Who is the fastest (CB4884E)
This 4-competitor TTL speed game was obtained in a 1980s documentation, but can still be easily...
Sonic defense (CB8238E)
This powerful sound emitter used in defense to intimidate people was found in a 90s Popular...
Power Failure Alarm (CB25348E)
This circuit triggers an alarm when the mains power is cut off. The circuit was found in the July...