The transistors of this circuit found in a 1965 magazine can be the BC558 and the sensitive 12 V x 50 mA relay. The other components are common.
In this circuit, the LED Will blink in a presence of na áudio signal in the input. Gain is...
This power supply with several transistors can supply a current of several amps and a voltage of...
This circuit is from a July 1990 American magazine that no longer exists Modern Electronics. It is...