This circuit is from an 80's Radio Electronics. The circuit has several output options for 50 mA currents with load indicator through LEDs.
It is an ideal assembly to be implemented as work by students of digital electronics courses, as...
This transistor can use any general-purpose germanium transistor like CK722 or 2N107. The circuit is...
This circuit for 12 V relays was found in the July 1992 Radio Electronics magazine. The circuit is set...