Transformers

[chava]

Hello
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 )

[russlk]

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.