Three 12 volt transofrmers in series instead of one 38V?

[Suraj Joneja]

Hi All,
I have an audio power amp kit which requires me to connect an AC-AC 38 volt
5 Amp Transformer.
I am having trouble finding this (38 V) transformer. My question is if it is
OK to connect the outputs of Three 12V 5 Amp Transformer in Series? further:
1) Is it recommeded?
2) Is it suitable for Audio power amp application? (My amp is MOSFET based)
3) Will there be substantial (if any) loss in efficiency in this 3
configuration over a single 38 V one?
4) Can somebody suggest alternate (AC or DC) sources of comparable Amperage
which I might use (such as SMPS or Laptop chargers etc.)

Many Thanks!
Suraj

 

[Roger Johansson]

"Suraj Joneja" <NOSPAMsurjonesNOSPAM@yahoo.com> wrote:

I have an audio power amp kit which requires me to connect an AC-AC 38
volt 5 Amp Transformer.
I am having trouble finding this (38 V) transformer. My question is if
it is OK to connect the outputs of Three 12V 5 Amp Transformer in
Series?

It is okay, no problems. It will work as one transformer.

further: 1) Is it recommeded?

It is not recommended, for weight and cost reasons, but electrically it
is no problem.

2) Is it suitable for Audio power amp application? (My amp is MOSFET

Yes, as well suited as one transformer is.

based) 3) Will there be substantial (if any) loss in efficiency in this
3 configuration over a single 38 V one?

I don't think so. The losses, which convert to heat, will be
approximately the same. It will be easier to keep the tranformer(s) cool
though, when you use 3 instead of one, that is an advantage.



--
Roger J.

 

[Larry Brasfield]

"Suraj Joneja" <NOSPAMsurjonesNOSPAM@yahoo.com> wrote
in message news:38gu9vF5o1ri7U1@individual.net...

Hi All,
Hello.
I have an audio power amp kit which requires me to connect an AC-AC 38 volt
5 Amp Transformer.
I am having trouble finding this (38 V) transformer. My question is if it is
OK to connect the outputs of Three 12V 5 Amp Transformer in Series? further:
1) Is it recommeded?

Sure, if you have the 3 parts already.
Just be sure the sense of the windings it right,
otherwise you may get only 12V.

2) Is it suitable for Audio power amp application? (My amp is MOSFET based)

The load typically requires power in a certain
voltage range and current range. Where it
comes from is immaterial.

3) Will there be substantial (if any) loss in efficiency in this 3
configuration over a single 38 V one?

There will be some loss of efficiency in the broad
sense of the word, referring to efficient use of
materials and other resources. But there is no
reason that, with sufficiently efficient transformers,
the net electrical efficiency cannot be the same as
for the individual transformers.

4) Can somebody suggest alternate (AC or DC) sources of comparable Amperage
which I might use (such as SMPS or Laptop chargers etc.)

An SMPS could be a good solution. I doubt
laptop chargers will do 190W. As for specific
sources or parts, some web research (on your
part) should turn up something.

Many Thanks!
Suraj
--

--Larry Brasfield
email: donotspam_larry_brasfield@hotmail.com
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