"Gaspar" wrote in message
. ..
Hallo!
The primary of the trasformer of my CD-Player Pioneer PD-5700 is open. (In
Italy the voltage is 220 V).
The transformer has another input. It is not open. Should it be for 110 V?
Could I buy a 220 to 110 V trasformer and so use the 110 V transformer
input?
Thank you!
Gaspar - Italy


If you take some other transformer giving some "safe" voltage and disconnect
all the leads from the transformer you are about to measure you can check
the ratio's between the different coils.

So - let's assume that you have transformer that produces 6V AC (note AC --
DC won't do).

If you take the assumed input and check the voltages on the "outputs" you
should see really low voltages.
You can now swap the 6V to the point where you saw the highest voltage.

Now you can measure the voltages between the different coil-ends. The "turn
ratios" are relative to the voltages and vice versa if there is no power
being drawn from the transformer.
Then you must know or find out what is the input voltage of your player and
then see if you got that to appropriate output what would be in the input.
Also it can be helpful to try to look the transformer with any markings of
the voltages - usually there is none but sometimes the transformers get
labelled on assembly with max ratings (voltage and amperage).

This of course will not give you 100% certain answer but at least will rule
out a possibility of totally blowing your device in case the two coils were
ment to be put in series in case of 110V.

Good luck

// Marko