[ARC5] Power Supplies for ARC-5

[J. Forster]

Nice knowing you!

A Variac does not isolate the load from the line. Doing what you suggest
without an isolation transformer is just asking to be killed.

FWIW,

-John

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



> My recomendation is to do what I did when I first started getting
> interested in this stuff, back in 1974.
>
> 1.  Buy a Variac.  They don't have to be expensive.  I bought one another
> one last year at a hamfest for $5.00.
> 2.  Put the Variac in a suitable box.
> 3.  Cobble up a coellection od switches and components so you can get a
> direct AC output, the output of the Variac run dirtectly into a full wave
> bridge and some big caps of a suitable rating, and the Variac output also
> run into the primary of some transformers that have output of 250V and up,
> as well as some with low voltages and the transformer outputs run into
> full wave bridges and suitable monster capacitor filtering.
>
> The result is a power supply that can run just about anything, including
> Command Sets at full or reduced volatges or even dynamotors.
>
> The ability to get dual DC outputs with one HV voltage at twice that of
> the other one (e.g., 45V and 90V or 67V and 130V) is useful for those
> surplus rigs that require that.
>
> And of course with that AC socket output you can use it as a Variac too.
>
> Just fuse both sides of the AC line though, since this universal power
> supply can lead to shorts when hooking up multple pieces of equipment with
> hot chassis. arrangements.
>
> For Command Sets make some sockets for the dynamotor pads using sheet
> plastic and brass tubing.  Don't use alligator clips for the power
> connections because then you WILL get the HV and filament power reversed
> at some point.
>
> Good luck!
>
> Wayne
> WB5WSV
>
>
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