[Elecraft] OT: Transformer windings, colour code?

[Don Brown]

Hi

Connect the primaries in series and connect a voltmeter across one of the
secondaries plug the transformer in quickly to see if there is an output on
the meter, If not reverse one of the primaries. Then connect the secandaries
in series if you get an output across both secondaries then go to the next
step if not reverse one of the secondaries. Now to connect in parallel move
the two wires from secondary 2 to secondary 1 maintaining the same polarity.
Check the output again with the voltmeter. If the output is as expected then
you got it.

Don Brown
KD5NDB


From: "Julian (G4ILO)" <g4ilo@qsl.net>
To: "Elecraft List" <elecraft@mailman.qth.net>
Sent: Saturday, December 21, 2002 11:56 AM
Subject: [Elecraft] OT: Transformer windings, colour code?


> I was all set to wire up my new power supply for my K2 when I hit a snag.
I
> don't know which windings to connect together to put the primaries in
> series (for 240V) and the secondaries in parallel. The only information
> provided is on the transformer itself, which says:
>
> Primary 2 x 115V Brown - White Black - Pink.
>
> Secondary 2 x 18V Red - Yellow Blue - Gray.
>
> I can't find any technical info on the manufacturer's website, except that
> it complies with the latest European standards. Is there a standard colour
> coding for transformers? Alternatively is there a safe way to find out
> which winding to connect to which using a meter? I'm afraid that if I
> connect them the wrong way round, out of phase, the thing may go up in
> smoke.
>
> 73,
> --
> Julian, G4ILO. (K2 #392)
> Homepage: http://www.qsl.net/g4ilo
>
>
> _______________________________________________
> Elecraft mailing list: Elecraft@mailman.qth.net
> You must be a list member to post to the list.
> Postings must be plain text (no HTML or attachments).
> See: http://mailman.qth.net/mailman/listinfo/elecraft
> Elecraft Web Page: http://www.elecraft.com
>