Ricardo,

Using an opto coupler made for this application makes the job very
straight forward.

The MOC3041 from Motorola is one such device. This switches at the AC
zero crossing point which may be an advantage or a disaster depending
on your application. I don't know where you live but RS (who are in
many countries) have them as part number  301-628.


regards

    Russell McMahon

-----Original Message-----
From: Ricardo Ponte G <rniniver@CANTV.NET>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Sunday, November 29, 1998 8:17 AM
Subject: How to switch a SCR? , Please some ideas...


        Hi people, How are you:

        Here IĞm trying to switch two SCR in some Hybrid module.  The
AC soruce is
220 Vrms and I got to do the job with a PIC.  Of course need to
isolated de
TTL reference from the Hybrid Module reference (GND) with optos.


        Any one out there have some good advice to me ???

        I want to thank you., bye and good luck.