Actual-size, single-side PCBs for the logic control section (on the left side of the dotted line) and relay driver section (on the right side of the dotted line) of the se%!ential power-'on' cIrcuit are shown in Figs 4 and 6, and their component layouts in Figs 5 and 7, respectively. Connectors have been provided on the r;CB for all the outputs (00 through 015) of IC4, RST, unregulated 12V, Vcc and GND. Thus it can be extend'ed for the relay driver section at any desired location. The PCB of the relay driver is made for two relays to drive two loads. You can extend the same to more than two loads by adding another PCB as shown in. Wire the circuit on the PCB shown in and extend it to any other equipment in the house. Use bases for all the ICs. Check continuity between respective connections using a multimeter. Connect the electrical loads through relay contacts as shown in.


One after another load is switched 'on' every 20 seconds. Manually reset all the loads if any of the sixteen loads turns on after power resump¬tion. Use mains-rated cable for all load connections.