variable V out for class a amp

[kp93300]

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

[AndrewT]

I recommend a multi-tapped transformer and build a conventional PSU.

[dtproff]

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

[kp93300]

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

[dtproff]

Originally Posted by kp93300

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

[Tony]

Originally Posted by kp93300

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...

[dtproff]

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

[kp93300]

Hi Tony,
Thanks for the suggestions which is worth exploring.
regards

kp93300

[Tony]

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....