I know nothing about Switch mode supplies...thus I need help

Hi oh helpfull ones.........

Can someone tell me if it is possible to modify an existing Switch mode supplys output. (eg current output = 12v, required output = 15v)

How is this done?....Yep I'm a switchmode dumbo, so any help would be very much appreciated.....that is after you have got through laughing at my obvious lacking in knowledge. Lets just say I'm old....thus lazy :lol:

Cheers

Jaba

hi,we need to know the current.in some topology you can do so,but can not in some other topology.just tell us what you need accurately ,so we can help you.

Ok..my initial question was a bit vague. A bit hard to be more definative in my required info, thus the question is for "generic" type info on the subject. I have collected quite a few different Switchmode supplies over the years, most are just sitting doing nothing so I thought it would be good to put them to use in a few of my projects.

As an example, I am currently building a "true" analogue music synth but my design is based around the old Curtis chipsets and requires +5, +15 and -15 Vdc. I have a couple of PC switchmodes I could use if I can alter the +12, -12 outputs to suit my need. The current requirement of the total synth is around 1 - 1.5 amps, thus a PC supply may be well suited. My only requirement other than that is that the supply voltage MUST be very stable and clean.

I hope this adds a little to my original request.

Cheers

Jaba

Ok..my initial question was a bit vague. A bit hard to be more definative in my required info, thus the question is for "generic" type info on the subject. I have collected quite a few different Switchmode supplies over the years, most are just sitting doing nothing so I thought it would be good to put them to use in a few of my projects.

As an example, I am currently building a "true" analogue music synth but my design is based around the old Curtis chipsets and requires +5, +15 and -15 Vdc. I have a couple of PC switchmodes I could use if I can alter the +12, -12 outputs to suit my need. The current requirement of the total synth is around 1 - 1.5 amps, thus a PC supply may be well suited. My only requirement other than that is that the supply voltage MUST be very stable and clean.

I hope this adds a little to my original request.

Cheers

Jaba

Hi,
There can be find various switch-mode controllers in switch-mode power supplies, so it would be better to get more information about those You have, but I think in a conventinal PC powersupply the different outputs are obtained from the same transformer, so you can't change voltage levels individually.