Date: Mon, 06 May 2002 15:00:29 -0700

Author: Bill Alexander

Subject: Re: Power Supply

Post:

You could purchase a used transformer, such as the 120VAC to 32VAC one
listed in the C & H Sales catalog (for $100), as well as a 10 A variac to
feed it with. Then all it would take is a full wave bridge. The capacitor
is more problematical, since you want to produce so much current. A large
choke would probably help get around that.

Bill

>Tappers,
>
>I would like to buy a 25 volt 25 amp variable DC power supply.
>It should simply consist of an on-off switch, a high current variac,
>a high current bridge, and a filter capacitor.
>
>Does anyone know where to get a variable DC supply this simple?
>
>Most power supplies have lower power and a lot more regulation.
>I don't mind having the ripple on the DC. I want 625 Watts power and low
>regulation.
>Mcmaster-Carr has manual battery chargers that are similar to this.
>But they do not have a variac so they're not variable, and they don't have
>a cap so they produce pulsating DC.
>
>Does anyone know where to get one like I described?
>
>Thanks.
>Can't wait for Boise!
>Jerry
>
>
>------------------------------------------------------------------
>Gerald Zani e-mail: Gerald_Zani@brown.edu
>Manager of Demonstrations phone: (401) 863-3964
>Department of Physics FAX: (401) 863-2024
>Brown University Providence, RI 02912-1843 USA
>

Bill Alexander Excuse me if I ramble,
Physics Dept. but I drive a Nash.
Humboldt State University
Arcata, CA 95521

phone: (707) 826-3212
e-mail: wca1@humboldt.edu
http://sorrel.humboldt.edu/~phyx/faculty/alexander.html

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