This circuit was found in the July 1994 issue of Electronics Now magazine. The relay can be rated at up to 12 V and 100 mA. The transistor is a general purpose transistor.
This metronome configuration with two transistors is well known to our readers and can be found...
This circuit was obtained in a 1984 publication, but it can be assembled using BC548 for TR1 and...
This circuit for small 3 V DC motors uses common components, and its action is controlled by the...