Re: Power Supply

Jon, I wanted to say thank you. You were right on on this problem
for me. After some calculations, I dropped a resistor into the line
that approximately simulated the load the circuit was supposed to
run. After some adjusting of my meter ranges (was accidently on
milivolts and read overload) I got an almost perfect reading of
24vdc from the supply. This supply runs off from a dual seconday
coil trans wired in parallel, this really threw me as I had never
seen one of these. There was also an inductor in this supply, which
really made me wonder about load conditions. So thanks again, you
were exactly right. I look forward to more good advice from the
group in the future.

Rob

--- In CAD_CAM_EDM_DRO@yahoogroups.com, brouwer@e... wrote:
> The transformer output will always be higher on no load and will
sag on
> load. By how much will depend on its "regulation" generally
speaking
> dependent on how much iron there is in it. If you know what the
average
> load is likely to be you could make a dummy load and test it. I
would
> expect that you would definitely need a higher no load output than
under
> normal running conditions in any case.
>
> Also, if you smooth the output with capacitors, as I would expect
to be the
> case, the no load output would be higher again. Depending on the
size of
> the capacitor that could affect the regulation as well.
>
> Your question ties in a little with my own query a few days ago
about a
> power supply. No responses here but I have since found that the
Darlington
> I require is a BDX33c, a 10 amp device. It is set for 39V but if
you need
> only 24V then it is not difficult to add a small regulator to
knock it
> down, in similar fashion by having a 24V zener in the base
connection.
>
>
> John Brouwer