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winding a power suppy

Old 05-17-2006, 06:55 PM
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winding a power suppy

I`m new to this part and want to learn I have a few amps in need of them so this is a good time to try my hand.The thing is I am not to sure where to start and how many winds to put on.The amp I`m starting now is a 75Wrms X2 amp in 4 ohms and 150Wrms X2 at 2ohms or 300Wrms X1 at 4ohms.I would like to beef it up a small bit because heat killed it last time.If anyone can help that would be mint or if anyone knows where to buy them that would be cool to but I`m realy in to doing my own.Thanks
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Old 05-17-2006, 07:08 PM
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forgot to ask will wire from hi end crossover coils work for this also I don`t want to use all my wire up and have tons of coils
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Old 05-17-2006, 07:29 PM
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If your trying to wind a transformer,

You can count the turns
or Measure the resistance, and calculate how many feet of wire you need to get that total resistance
and
you need to use the same gauge wire
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Old 05-17-2006, 08:01 PM
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ya but what if the amp will be beefed up I will be making it bigger so to say.Ok say if i was from the drawing board to final product how would I find all that info at the drawing board(say if the amp is not even to PCB form im in draft)?
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Old 05-17-2006, 08:02 PM
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Originally Posted by abnormal72
If your trying to wind a transformer,

You can count the turns
or Measure the resistance, and calculate how many feet of wire you need to get that total resistance
and
you need to use the same gauge wire

transformers work of the amount of turns and the ratio of them
primary vs secondary

resistance has nothing to do with it
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Old 05-17-2006, 08:04 PM
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ya i was lost on that part to I found nothing like that but How would I find that stuff all out(amount of turns and the ratio of them primary vs secondary)?

Last edited by Not loud enough; 05-17-2006 at 09:12 PM.
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Old 05-17-2006, 09:23 PM
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I wound it back up and found dual primary @ 16 winds(smaller wire) and dual secondary @ 7 winds (bit bigger wire)
I would like to beef it up a bit for cooling reasons
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Old 05-18-2006, 12:34 AM
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As long as the ratio remains the same you can put more wraps on, so you could do 32/14 for more power handling. Ideally, unless you know the characteristics of the amp very well, you will want to keep about the same total resistance, so if you used a 32/14 you would want twice the cross-sectional area or 2^0.5 (square-root of two) times the original diameter.

The turns ratio will determine the primary to secondary voltage, the resistance will determine the amount of current actually passing through the primary as well as the heat dissapated in the transformer.
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Old 05-18-2006, 12:56 AM
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so if i go with a bit(vary small diff) bigger wire also will this work too?Thanks
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Old 05-18-2006, 06:01 AM
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Originally Posted by pinhead
transformers work of the amount of turns and the ratio of them
primary vs secondary

resistance has nothing to do with it
What i meant by the resistance is that if you measure the dc resistance of the primary for example, and identify the gauge of wire, this will give you an idea of the total length of wire used on the primary by comparing the resistance per foot.
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