[ARC5] running ARC-5 receiever fillaments on AC.

[J Mcvey]

Thanks to all who replied.I use battery or medical grade SMPS to run my dynamotors and evrything on DC as designed.
I'm fixing this power supply thing up for a friend of mine. The concept was OK, but the construction is a hot mess!It's now gutted so grommets can be installed and the wiring gets completely re-done.
>From the your input, I'm going with the original xfmr full wave rectified with si diodes ( like it was).That will yield about 175 which I hope won't sag too much...we'll see...
I'm going to rectify the 24VAC to 33.6 VDC  and pass that through a LM7824 to get back to 24V.That should keep the oscillators happy!
I tried to send a picture , but it bounced the post!
 

    On Saturday, August 26, 2017 5:43 PM, Bill Cromwell <wrcromwell at gmail.com> wrote:
 

 Hi,

I use battery power for both the heaters and the B+. At 90 volts DC on 
the B+ my radios draw about 15 mA. Your 25 mA B+ supply may be enough. I 
evolved to pure DC and avoid the AC power supplies because it gets rid 
of ALL the power line conducted crud. It won't help with atmospheric QRN 
or radiated junk from a neighbors naughty television but it helps with 
whats on the power line (because the power line isn't connected to it.

Somebody else commented about the stability with DC on the heaters. I 
found the same result. Pipe the audio into your computer sound card and 
run fldigi, spectran, or other software =with a "waterfall" display. The 
command receivers will produce a straight line down the waterfall frome 
stable received signals. That means the oscillators are not wobbling 
around varying  heater energy when we use regulated DC (or batteries).

73,

Bill  KU8H

On 08/26/2017 01:03 PM, J Mcvey via ARC5 wrote:
> Thanks, The reason I ask is that I an old home-brew receiver power
> supply that someone made.
>
> Now the next thing i discovered is that the transformer is probably
> under -powered.
> It's a stancor PS-8416 125-0-125 @ 25ma.
> The rectified voltage may be sufficient but the current is probably too
> light?
>
>
> On Saturday, August 26, 2017 12:27 PM, David Stinson
> <arc5 at ix.netcom.com> wrote:
>
>
>
>
> From: J Mcvey via ARC5
> Subject: [ARC5] running ARC-5 receiever fillaments on AC.
>
> What is the consensus on ac vs dc filament supplies for the receivers?
> Does it make a difference? Do they tend to get hum in output?
>
> -----------------------
>
> It has been my experience that AC filaments inevitably introduce some
> amount of hum, for various reasons.  YMMV, of course.
> Dave S.
>
>
>
>
>
>
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-- 
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