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Old 25th May 2004, 03:16 AM   #1
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Default parallel the transformers

Hello, can I parallel the transformers in class A power amp? because I want to save the capacitors & money.Is it good ?
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Old 25th May 2004, 01:44 PM   #2
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billy,

>>can I parallel the transformers
>>save the capacitors & money

Explain with a little more details, parallel the primaries, the secondaries,
what is the power in VA of the transformers you want to use and how many?

Save the capacitors, I don't think so ; you need a certain minimal amount of these
to have a good power supply.

Save money, well with a Class A, certainly not!

Regards.

Alain.
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Old 25th May 2004, 02:22 PM   #3
K-amps is offline K-amps  United States
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Default Re: parallel the transformers

Quote:
Originally posted by billy
Hello, can I parallel the transformers in class A power amp? because I want to save the capacitors & money.Is it good ?
My guess is if the transformers are well matched, you can paralell all connections


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Old 25th May 2004, 02:49 PM   #4
D3 is offline D3  England
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Default Traffo secondary .... paralleling

Hi ...... my traffo has two sets of 18v secondaries rated @18v 500va.......so in theory if I parallel.....I should get 18v 1000va......

Will this give hum ..... earth loop problems?????

Has anybody else come across/used this config.....
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Old 25th May 2004, 03:23 PM   #5
moamps is offline moamps  Croatia
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Default Re: Re: parallel the transformers

K-amps,
In practice, matching secondary voltage on two different transformers almost isn't possible. Small difference (in apsolute values or phase) will result in huge current between secondaries (very small internal resistance).

Billy,
if you have two transformers with 2*18/500VA you can build two monoblocks or you can parallel them, but after bridges to get 2*18V/1000VA. You can't anyway saving money on caps.

Regards
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Old 25th May 2004, 03:27 PM   #6
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Default Re: Re: Re: parallel the transformers

Quote:
Originally posted by moamps
K-amps,
In practice, matching secondary voltage on two different transformers almost isn't possible. Small difference (in apsolute values or phase) will result in huge current between secondaries (very small internal resistance).
However, for some types of PCB mount transformers the
manufacturers actually specify that you can parallel windings.
Probably it is because they have a very low VA rating and
thus so many turns in the windings that the potential error
is negligible.
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Old 25th May 2004, 03:30 PM   #7
D3 is offline D3  England
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Default Traffo..

Sorry I am a little confused with your english.......2x500va @ 18v
parralleled = 18v @1000va.................is this what you are saying...

Are there likely to be residual earth problems........
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Old 25th May 2004, 03:33 PM   #8
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I think what he means is that yes, you can parallel secondary
windings of the same or different transformers if they have the
same rating and you use separate bridges for the windings
and tie them together after the bridges, not before.
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Old 25th May 2004, 03:39 PM   #9
moamps is offline moamps  Croatia
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Default Re: Re: Re: Re: parallel the transformers

Quote:
Originally posted by Christer
However, for some types of PCB mount transformers the
manufacturers actually specify that you can parallel windings.
Hi,
Paralleling secondaries on one transformers is possible if they are biffilar wounded.
Quote:
Probably it is because they have a very low VA rating and
thus so many turns in the windings that the potential error
is negligible. [/B]
Agreed.
Regards
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Old 25th May 2004, 03:41 PM   #10
D3 is offline D3  England
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Default Traffo

Thanks Christer.........
Is it dangerous..............or will it destroy traffo to link up the secondaries before the rectifier???? Bearing in mind my traffo has two sets of 18v secondaries................all wound on same core.
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