FW: [Elecraft] OT: Transformer windings, colour code?

Sat Dec 21 13:12:16 2002

Just musings, but...

For the secondaries, just hook up one primary to supply. Tie Yellow to Blue.
Put an ac voltmeter on Red and Gray. If there's around 35v, you're golden,
else tie Yellow to Gray.

For the primary, you can do the same thing, only backwards. As you've
already figured out the secondary, drive it with a reasonable ac voltage. If
you have two transformers, you're set, use one to ring-out the other. If
not, a voltage divider out of junk-box resistors ought to do it.

For these tests, there shouldn't be any more current in the system than to
drive a voltmeter, and that's not much!

Once you're certain about phase, then applying the mains to the primary
should keep the smoke inside the wires.

Dan / WG4S / K2 #2456

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Julian (G4ILO)
Sent: Saturday, December 21, 2002 12:57 PM
To: Elecraft List
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

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