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Joined: Mon Sep 22, 2003 1:01 am
Location: Israel


Post by chava » Sun Dec 28, 2003 10:51 am

I have 4 transformers which I removed from a PC power supply module.
How can I know the way the coil is aranged in the transformer.
here is the description of the transformers:
1.square core,in one side two wires connected the trasformer to the pcb, in the other side 6 wires.<p>2.square core, 3 wires from one side and 5 form the other side<p>3. also square core, 5 wires from each side of the transformer<p>4./ round core, 5 wires from each side ( apparentli, 5 wires are wounded around the core )
Jukin Chava<p>E.Dove Israel

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Joined: Thu Dec 06, 2001 1:01 am
Location: New Hampshire

Re: Transformers

Post by russlk » Sun Dec 28, 2003 5:06 pm

Using an ohmmeter, measure from each wire to all the other wires in order to determine which are connected. These are most likley switching supplies which operate at a high frequency, 20kHz to 100kHz. You can use a signal generator at low voltage to determine the turns ratio. The voltage ratio is equal to the turns ratio.

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