🚀 go-pugleaf

legg wrote:
> On Wed, 11 Jun 2008 11:24:33 +1000, F Murtz <haggisz@hotmail.com>
> wrote:
> 
>> F Murtz wrote:
>>> I would like to make an adjustable power supply using a transformer with 
>>> a 24v 5a single wound secondary I would like the voltage to be 
>>> adjustable from lowest to highest possible given transformer I would 
>>> like to have regulated current
>>>
>>> There is another possibility I also have a larger transformer with two 
>>> 32v 4.7a secondaries If anyone has a schematic for an adjustable power 
>>> supply with adjustable current regulation making the most of the 
>>> transformer specs I would be eternally grateful
>>
>> Thanks to every one for their help on power supply design from spec 
>> sheets etc but I was hoping for an already designed circuit
> 
> It would be a pity, putting together your first power supply without
> taking the oportunity to learn something about it. I mean - what are
> you going to be using the completed power supply for, if not as a
> learning tool?
> 
> A fair supply of app notes are available on the web to help you do
> this, in consideration of the fact that you want to tailor the circuit
> to transformers that you already have. Normally you wouldn't purchase
> a part before you had some idea of what you needed, to do what you
> aimed to do.
> 
> http://www.ieeta.pt/~alex/docs/ApplicationNotes/Rectifier%20Applications%20Handbook.pdf
> 
> A kit or pre-built/surplus unit may be an obvious alternative to the
> bulk of all this 'learning' stuff. Even then, getting what you need
> still requires an aim, to specify a requirement.
> 
> One kind of regulation method that is fairly tolerant of transformer
> fixed winding voltages is illustrated at 
> 
> http://members.shaw.ca/legg/1991a.html
> 
> This also offers a pspice simulation that runs in the free SWCADIII
> package from Linear Technology. It takes a lot more savy to graft
> regulation circuits onto un-anticipated transformers than it does to
> design for a transformer from scratch, or fit a properly configured
> transformer into a pre-designed configuration. 
> 
> RL
Thanks I will look into what you have said.
The reason for using these transformers is that I already have them. I 
did not buy them They were disused equipment