[ARC5] Power Supplies for Your ARC-5

[Mike Feher]

I have some 24 Volt transformers rated at a conservative 80 Amps. They weigh
about 80 pounds each. This will provide adequate staring current for most of
your military dynamotors. Price is $100 each plus shipping. 73 - Mike


Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ, 07731
(732) 901-9193


----- Original Message -----
From: "David Stinson" <arc5@ix.netcom.com>
To: "ARC-5" <arc5@mailman.qth.net>
Sent: Tuesday, January 15, 2002 11:03 AM
Subject: [ARC5] Power Supplies for Your ARC-5


> The current ratings written on the dynamotors
> are the running currents.  The starting surge current
> will be much higher.  I don't remember off hand what
> the starting current for a DM-33 or DY-8 is, but I think
> it's around 25 amps.
> Most of these supplies have protection against surges.
> If you use a lower-current supply,
> most will "crowbar" and go to zero until reset.
> A 10-12 amp supply will run your receivers OK,
> but it won't start a DY-8 or DM-33.
>
> You can overcome this by using some large capacitors
> in a bank to provide the surge current, while the power supply
> provides the running current.  24 volts in batteries will
> also work.  Old IBM printers and antique
> main frame computer equipment contain lots of these big
> caps, where they served the same function.
>
> If you use a switcher, you'll likely need to build an
> RF bypassed enclosure.  They're designed for lasers and
> RFI isn't usually an issue for those applications.
>
> Some 24-28 volt supplies at higher currents
> on the Bay right now:
>
> 1322466303
> 1690276274
> 1062389767
> 1688821631 (good deal on this one but will need shielding).
>
> 73 Dave Stinson AB5S
>
> --
> "I'd rather be damned by a thousand wrongdoers
>  then by my own conscience."
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