[ARC5] Simple Question Arc-5 receiver power supply requirements?

[J. Forster]

Do you plan on building the supply in a separate box or to plug in place
of the dyno?

If I were not a pureist and partial to dynos and dynaverters, I'd build an
AC supply to plug in where the dyno was mounted and put out oth the 250
VDC and 28 VDC. Furthermore, I'd regulate both supplies, which is simple
enough today with the semiconductors available now. Regulation will allow
you to use smaller filter caps too. No modifications to the set would be
required.

I suspect the entire thing could be built on a single, single sided PCB
with a hole pattern to match the dyno.

Another thought. You could use a standard wall-wart that puts out 24 or 28
VAC and use a little filament transformer wired backwards with a doubler
for B+. This would eliminate having line appear on the unit.

FWIW,

-John

==============



> Hello:
> I started collecting ARC-5 receivers a few years ago and I find I have
> accumulated  a nice heap.  I'd like to put them into operation but I need
> power supplies.  Rather than source parts from my junk box and ebay and
> build multiple different power supplies, I decided to do a clean design
> from the ground up using ordinary Mouser- Digikey type parts which will
> allow me to make several identical supplies.
>
>
> I thought the simple part would be to look up the voltage-current
> requirements but my efforts turned up a wide range of values.    The
> median seems to be 250vdc-80 mA and 28vdc - 400 mA obviously for receivers
> still wired for 28vdc filaments.
>
> I have also read of using less than 250 vdc to reduce the component
> voltage stress. 
>
>
> Filament voltage was of course dc in the original applications,  ham
> conversion generally used ac but I have seen some comments about returning
> to dc filament operation.
>
> So what do you guys think is the ideal power supply operating
> specifications?  250vdc at 80 mA for the plates or something
> lower----28vac at 400 mA for the filaments or is there any practical
> reason to use dc?  Current specs listed above are actual expected receiver
> power supply currents with no power supply safety margin
>
>
> thank you in advance for your comments.
>
> bruce   KJ3Z
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