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Old 27th December 2010, 04:01 PM   #1
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Default Two (or more) transformers to increase power ??

Is it practically possible to increase the power needed by using more than one similar transformers ? Look at the image of the circuit I have in my mind, need to know if this combination is possible? I don't have an option for a higher rated transformer or getting a custom one made for now.
I currently have Two 24-0-24/5A transformers and would want to use both as the other one is sitting ideal and I need more power. This is for a 50+50W RMS chipamp I have based on STK4191II IC.
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Old 27th December 2010, 04:58 PM   #2
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You might want to use one transformer for the + rail and the other transformer for the - rail.
Parallel transformers will only work if both transformers are identical.
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Old 27th December 2010, 07:54 PM   #3
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If you have a pair of transformers, you can just parallel them into a single (bridge or other) rectifier if the diode ratings can handle the power. No need to double up on the bridges and caps, but no problem either, as far as I know.
Just make sure the phasing of the transformers is correct.

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Old 27th December 2010, 08:05 PM   #4
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If you do not change the supply voltage to the amp, there's no increase in power with more xformers. In case the supply sags a bit under continuous full load, an extra xformer may help to make the sag less.
But continuous full power only happens at the test bench, not with music.
So, an extra transformer doesn't make your system more powerfull, unless you increase the supply voltage. When you do that, you must make sure that the amp can handle the extra voltage, and that the heatsink is large enough etc etc. Not a simle 'plug and play' mod.

jan didden
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Old 27th December 2010, 08:52 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

Unless your building a laboratory amplifier the simple fact is music at
clipping level does not need RMS rated power supplies. It turns out
most 8 ohm RMS supplies can easily handle 4 ohm music program
at the clipping point. Large supplies do not give more power much.

rgds, sreten.
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