solid state relays

["Cordeiro, Alan" <Alan.Cordeiro@mts.com>]

Dave,

There are many different types of solid state relays, the main
similarity is that they all have no moving parts.

A.C. solid state relays are usually Triacs with a control voltage,
D.C. solid state relays tend to be plain transistors intrernally, and
will have the standard "VCe Sat" voltage drop. Many times they
come with built in opto-transistor based isolators.

One way to reduce the drop is to use Germanium transistors, but 
the last of those animals I used were the good old OC71s from Mullard. 
A good germanium power transistor will keep the drop in the 0.15 to 
0.2 volt range, if you can find one......

Alan

>Date: Fri, 7 May 1999 08:53:50 -0500 
>From: "Browning David (TVCS)" <BrowningD@tce.com>
>Subject: RE: transistors instead of relays

>What about solid state relays?  Anybody an expert on those?

>dB
>'86 4000 H1/H4's w/ relays.