Relay computers

From: Tom Jennings <>
Date: Fri Sep 24 15:01:08 2004

On Fri, 2004-09-24 at 08:03, Paul Koning wrote:

> I think when people talk about "gates" in a logic design, it's
> normalized back to the simplest kind: 2 input gates. So that's two
> relays.

Well, with multi-terminal devices like relays, you get lots of outputs,
double-pole sort of "open collector". Plus, when circumstances allow it,
you can use ONE relay coil as two inputs; the two ends of the coil
winding are coil1 and coil2:

coil1 coil2
-v -v off
-v +v on
+v -v on
+v +v off

Can't do that with a transistor!
Received on Fri Sep 24 2004 - 15:01:08 BST

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