Terry Allen Steen, EE of Marina Power says:
The easiest way I have found is to drive the LED half of an optoisolator. Connect the output side to the relay and its source. I use the H11G2 (just because I have them around).+-------+ PIC OUT---| |--+--RELAY--+- High voltage | | | | | H11G2 | '--DIODE>-' ,--| |--, | | | | \|/ +-------+ \|/ GND GND
Paul B. Webster says:And you *did* mean to put a resistor in series with the opto input, did you not? And the diode across the relay?
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<A HREF="http://www.massmind.org/Techref/io/relay/IsoHV.htm"> Relay / Solenoid IO Driver:</A>
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