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More  Relay Circuits

Computer Controlled Power Relay -- July 31, 2011


Often there is a need to turn on and off a 120vac device using a low power +5v logic signal from a computer.  The circuit below shows how this could be done.  The circuit uses a power relay with a 120vac coil and 10 Amp contacts.  A small solid state relay turns on and off the relay.  The solid state relay provides 5KV isolation from the computer.

 

Click on Drawing Below to view PDF version of Schematic

Computer Controlled Relay circuit designed by David Johnson, P.E.



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