| Some relays will become warm if they remain energised for some time. The circuit shown here will actuate the relay as before but then reduce...
Myo Min (14)
| This circuit is innovative in more than one way and therefore belongs per se in Elektor’s Small Circuits Collection. Firstly, it demonstrate...
| Most darkness activated alarms employ opamps and some logic ICs. Here, a less expensive approach is shown based on the eternal 555, this tim...
| This circuit may be used to replace the single current limiting resistor often found in dirt cheap battery chargers. The alternative shown h...