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]

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

 

[TonyTecson]

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...

An externally hosted image should be here but it was not working when we last tested it.

 

[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

 

[TonyTecson]

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....