[GreenKeys] 120vdc at 4-5 amps?

[drlegendre]

Not sure if it's already been mentioned, but you could use a 12V 4-5A
transformer to buck-off the extra voltage at the output or input of a
120:120 isolation transformer. Bucked down to 108V, rectified and filtered,
you should end up just about where you want to be.

On Tue, May 1, 2018 at 8:19 PM, <hwhall at compuserve.com> wrote:

> Couple ideas:
> 1.  Start out with the isolation transformer idea, find out what the
> final DC output is when rectified & filtered, cut into the transformer &
> take off some turns.
> 2.  Make the above power supply but feed it with a variac instead of
> cutting up the isolation transformer.
>
> Wayne
> WB4OGM
>
> -----Original Message-----
> From: ken Schwieker <ksweek at mindspring.com>
> To: GreenKeys <GreenKeys at mailman.qth.net>
> Sent: Tue, May 1, 2018 6:25 pm
> Subject: Re: [GreenKeys] 120vdc at 4-5 amps?
>
> If you use an isolation transformer you will end up with considerably more
> than 120 volts dc after rectifying and filtering. One possible solution is
> to get a variac, remove all the center hardware
> and wind enough turns of insulated wire for the secondary to produce the
> needed voltage.
> Ken S
>
> At 11:13 AM 5/1/2018, you wrote:
>
> No, I don't need to run 100 loops at once. I have several pieces of gear
> with 120vdc motors and it would be nice not to have to plug/unplug them one
> at a time on my 1A supply.
> Any suggestions about where to find a suitable transformer? -Â  Diodes and
> caps are no problem. I'll keep an eye out at the Dayton hamfest.
>
> Nick England K4NYW
> www.navy-radio.com
>
>
>
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