looking for dp relay for single switch

[scott thomas]

Sorry, no blank spaces available. The only blank
was taken up by the fog light button I'm trying
to use. It presently operates driving lights
that barely do their job (p.o.). I have many
many boxes of Audi relays from parted cars. I
was hoping that one of them might do the trick.
I don't want any clutter in my car just to get a
dual mode aux light. I might just wire one side,
then swap it if conditions need it.
---- Begin Original Message ----

From: Huw Powell <human747 at attbi.com>
Sent: Mon, 26 Aug 2002 16:34:20 -0400
To: scott thomas <scott at dreamtheater.zzn.com>
CC: quattro at audifans.com
Subject: Re: looking for dp relay for single
switch



> I'm gonna be buying one of those PIAA combo
> fog/driving light sets. Now, I have the single
> throw fog light button on my 200's dash. I
would
> like to use this switch to operate both sides
of
> the light. I would like three different modes:
> 1. fogs
> 2. driving
> 3. off
>
> Are there any relays out there like this that
> operate off one single throw switch?

the short answer would be "no, forget it."

If you feel like building some sort of logic
circuit with several
relays, using the stock switch as a trigger for
each step of the way,
you might be able to.  There will be no simple
way to make a 0-1 switch
do several things without playing some fun games.

let's say you want the "cycle" to be off-fogs-
driving-off, which is the
simplest and requires 3 output states - each one
triggered by a
momentary activation of the dash switch.

You'll want to use double pole relays, where one
pole turns on the light
in question, and the other one changes
the "function" of your dash
switch, making it turn on *the other*
relay.  These relays will also
have to stay "on" until instructed to
turn "off", ie latching relays.
You might be able to pull this off with two of
them, they are expensive
though, might be better to get a couple of low
current ones and let them
trigger some simple high current SPST relays to
actually run the bulbs.

probably easier to get a spare switch from a
wreck and use one switch
for each function.  The 200 has some blank
spaces available, right?

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/


---- End Original Message ----



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