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Subject: TRIACS ???

Date: 11/19/02 at 5:43 PM
Posted by: Darren
E-mail: dazlogan@aol.com
Message Posted:

Hi all,

I've never used TRIACS before and there is a possiblity that i shall use one as an alternative to a relay.

Trouble is, I know nothing about them.

Can triacs be used to switch DC as well as AC signals ?
(I ask this because I seem to remember it is only AC ???)

On the triac data sheets, for example the T405-B from ST electronics it says Vdrm = 400V to 600V. Is this AC or DC or both ??? (what does the drm stand for ?).

Is there any difference in the way one should drive a triac in a DC circuit to an AC circuit ?

Ideally, I'd like to be able to switch AC and DC with the following specs:
DC - from 5 to 24V
AC - 90V to 240V

I don't want to use a relay !


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