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Posted - Jun 15 2003 : 12:26:13 PM Hi > I need help on how to connect the output of a 555 timer to the gate of a SCR. Is it necessary to used a resistor in series|.. The operating voltage is 12 V and the Scr is switching a very low load, 50 ma. Also, if the gate wire is very long from the 555 timer, is it necessary to use a low value Cap. to avoid interference false triggering.. Thanks for any help Mario