Mains master/slave control Mk2

This circuit allows one or several mains-operated apparatus (‘slaves’) to be automatically switched on when a ‘master’ apparatus is switched on. It is basically an enhanced version of the ‘Thrifty Mains-Slave Unit’ published in the December 1996 issue of Elektor Electronics. This time, the design is complete with a PCB. Also, use is made of a current transformer made from wire with a diameter of 1.5 mm. The important consequence of this change is that higher master currents are allowed.