[ARC5] Building a power supply for an ARC setup

[J. Forster]

I can give you a definite maybe.

The winds can be paralleled, IF they are close enough in output voltage.
This can be measured:

By hooking the secondaries to buck, and measuring the net voltage. If the
difference is a couple of volts or less, with full line on the primary,
you are probably good to go.

Another possible test is to hook the secondaries to buck, put a small lamp
115V bulb (25W or so) in series with the primary, and plug it in. Check
the buld brightness with the secondaries connected to buck and open. If
the light bulb stays about the same brightness, you are good to go. If the
lamp gets much brighter with the secondaries paralleled, it's probably not
a good idea.

With a capacitor input filter, the output voltage will be roughly 1.4x the
RMS AC voltage.

Best,

-John

===========





> I have been hunting around for a HV transformer for a power
> supply specifically for a BC-696 (and a future series modulator) - and
> last
> year happened on what looks like a half finished power supply consisting
> of
> a Freed RPG-26 at a local hamfest.
>
> According to the specs this transformer can deliver 900v at 320 va. Yikes
> -
> a bit TOO much voltage.
>
>  However, this transformer has a nice feature in that the secondary is
> actually TWO separate secondaries - each one (I'm guessing) delivering
> 450v
> on an 16 ohm coil.
>
> My question is:   Can I parallel the secondaries for 450V ac with more
> current?
>
>  According Duncan Amps PSU Designer- that would give me around 528 volts
> DC
>  IF I  can find a 5hy Inductor that will withstand the current load.
>
> Am I barking up the wrong tree?  I need an OT to straighten me out
> then....
>
>
> Thanks for all your help in advance.
>
>
> Fred Cousins
>
> KD7EDW
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