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Old 10th January 2012, 04:03 AM   #1
kp93300 is offline kp93300  Malaysia
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Default variable V out for class a amp

Hi
i like to build amps to try and hence the need for variable output.
Big Transformers and caps are expensive !
I am looking for suggestions for smps where V out can be adjusted with about 5 amp capability.
I need +/- rails up to 50 V

thanks

kp93300
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Old 10th January 2012, 10:59 AM   #2
AndrewT is offline AndrewT  Scotland
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I recommend a multi-tapped transformer and build a conventional PSU.
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Old 10th January 2012, 11:06 AM   #3
dtproff is offline dtproff  United States
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A smps flyback would be your best bet for this topology. You could probably move the Vo about 25% or so without serious loop issues.

Tony
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Old 11th January 2012, 03:34 AM   #4
kp93300 is offline kp93300  Malaysia
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Hi
thanks for the replies.
Seems that it is difficult to buy a smps with a wide range of V out between 24 v to 45 v dc .
kp93300
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Old 11th January 2012, 04:18 AM   #5
dtproff is offline dtproff  United States
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Quote:
Originally Posted by kp93300 View Post
Hi
thanks for the replies.
Seems that it is difficult to buy a smps with a wide range of V out between 24 v to 45 v dc .
kp93300
You can buy lab supplies that can do it but they are expensive. The loop compensation for these wide range supplies becomes difficult.

Tony
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Old 11th January 2012, 05:27 AM   #6
AJT is offline AJT  Philippines
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Quote:
Originally Posted by kp93300 View Post
Hi
i like to build amps to try and hence the need for variable output.
Big Transformers and caps are expensive !
I am looking for suggestions for smps where V out can be adjusted with about 5 amp capability.
I need +/- rails up to 50 V

thanks

kp93300
you can use a variac so that you can play around with the voltages for your amps....but you will steel need an isolation type power traffo...

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Old 11th January 2012, 11:04 AM   #7
dtproff is offline dtproff  United States
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Sorry, I guess I missed something. I thought these were SMPS. My apologies.

Add a 1KVA isolation transformer in from of the variac and you are done.

Tony
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Old 11th January 2012, 11:59 PM   #8
kp93300 is offline kp93300  Malaysia
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Hi Tony,
Thanks for the suggestions which is worth exploring.
regards

kp93300
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Old 12th January 2012, 12:02 AM   #9
AJT is offline AJT  Philippines
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which Tony? my suggestion is to use the isolation type power transformer after the variac so you can play with input voltages to get the rail voltages you desire....
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