[TechAssist] Re: Home-Made Precision DC Power supply
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 15 Jan 2004 10:22:06 -0500
Yes, schematic is included in the PDF file which is now available in the
members section.
Last night I uploaded the PDF and text file to the members section, but
I couldn't see it in the list afterwards. I tried again this morning
with same result. I was using Mozilla 1.5 browser so I thought maybe it
only works with Internet Explorer. Tried it with that and now the files
have uploaded successfully.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
"James M. Knoble" wrote:
>
> Was there to be a schematic to go along with this article? I would like to
> see it.knobletv@xxxxxxxxxx
>
> On Thu, 15 Jan 2004 01:40:16 -0500, Gary McCartney wrote
> > A while back I was to scan a circuit of a great home-made dc power
> > supply and send to a few of you who were interested in it. Sorry
> > that I got side-tracked and never got it made into a PDF file until now.
> >
> > This is a building project for a 33 V dc, 3 Amp , voltage and current
> > adjustable, regulated
> >
> > power supply. The output voltage and current capabilities can be altered
> > by switching a few
> > of the parts.
> >
> > To make the power supply into a 36 V, 5 Amp supply, change the power
> > transformer to a 36V, 6
> >
> > Amp, and change the main filter cap to 6800 uF, 50V or 63V. The emitter
> > resistors on the 2N3055 transistors may also have to be altered.
> >
> > I built this power supply 20 years ago and I still use it today. I added
> > a digital readout of the output voltage adjust but kept the current
> > meter as analog so I could see swings in current draw very quickly.
> > I built it with specs of zero to 36V dc regulated output at zero to 5
> > Amps. You can short the output leads together and the sparks will fly
> > but the maximum current drawn is only that amount set by the current
> > adjust potentimeter. You can't harm the unit doing this, it is built
> > like a tank.
> >
> > I uploaded the PDF file to the members area, it is called "Precision
> > Power Supply.pdf" however after the upload I checked for the file
> > but I couldn't see it listed. I also uploaded a small text file to
> > go along with the pdf.
> >
> > Another very easy way to make a great power supply is to use an
> > LM338 3 pin regulator IC (as I also explained in another reply to
> > the list). This IC can control a regulated power supply from 1.2 to
> > 32V dc at 5Amp continuous, or 7A peak. Higher output voltage can be
> > obtained by adding a zener to ground.
> >
> > Go to National Semiconductor's web site and download the data sheet.
> > you will see how versatile this IC can be.
> >
> > http://www.national.com/pf/LM/LM338.html
> > --
> >
> > Gary McCartney
> >
> > McCartney Electronics
> > Guelph Ontario Canada
> > Est. 1984
> > email: gary (at) number63.ca
> >
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> --------------------------
> James M. Knoble
> jmk1938@xxxxxxxxxx
> P: 304-366-1938
> F: 304-367-8965
> --------------------------
> KnobleNet Webmail
> (http://www.knoble.org)
>
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