On Wed, 23 Sep 1998 11:13:27 -0400, Jim Ruxton wrote:

> I'm trying to figure out how to drive 2  inverse parallel SCRs. From a
>PIC to control a full wave AC load. I am using a cheap and dirty non
>isolated power supply so my pic ground is sitting at neutral. Driving
>the one SCR that has its Cathode on the neutral line is no problem but
>driving the one that has its' Anode attached to neutral is the problem.

How are you driving the gate?
If you are using an optocoupler device then the collector
of the opto needs to be connected to the neutral wire and
not the hot wire for the negative half cycle SCR.




--
Richard A. Smith                         Bitworks, Inc.
rsmith@bitworks.com               501.521.3908
Sr. Design Engineer        http://www.bitworks.com