<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">I've picked up used laptop or printer power supplies at Goodwill or the local electronics recycler for a couple bucks. Take your reading glasses with you, and look for one with an output in the 24-30v range.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Phil</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jan 29, 2015 at 11:08 AM, <span dir="ltr"><<a href="mailto:Jarmo.Venalainen@schneider-electric.com" target="_blank">Jarmo.Venalainen@schneider-electric.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font face="sans-serif">Hi:</font>
<br>
<br><font face="sans-serif">For such a small amount of power you
could consider using an energy limiting Class2 transformer as is/was used
in old doorbells. You would have to put a bridge rectifier and bulk
capacitor on the output to make DC, but that should be ok given the power
levels. If you do this, make sure that the bridge rectifier and capacitor
are physically very close to the transformer to reduce problems with diode
reverse recovery losses which can stress the parts.</font>
<br>
<br><font face="sans-serif">Here's a link to Hammond transformers
of that type, although they are no doubt available from many sources at
most electrical supply houses.</font>
<br>
<br><a href="http://www.hammondmfg.com/ba.htm" target="_blank"><font color="blue" face="sans-serif">http://www.hammondmfg.com/ba.htm</font></a>
<br>
<br><font face="sans-serif">JARMO <br>
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Jarmo Venalainen</b> | </font><font size="1" color="#008000" face="Arial"><b>
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<td><font size="1" color="#5f5f5f" face="sans-serif">From:</font>
</td><td><font size="1" face="sans-serif">"Dave" <<a href="mailto:dave@independentpowerllc.com" target="_blank">dave@independentpowerllc.com</a>></font>
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<td><font size="1" color="#5f5f5f" face="sans-serif">To:</font>
</td><td><font size="1" face="sans-serif">"'RE-wrenches'" <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>>,
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<td><font size="1" color="#5f5f5f" face="sans-serif">Date:</font>
</td><td><font size="1" face="sans-serif">01/29/2015 10:58 AM</font>
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<td><font size="1" color="#5f5f5f" face="sans-serif">Subject:</font>
</td><td><font size="1" face="sans-serif">Re: [RE-wrenches] Low wattage 120vac
to 24vdc transformer for LED's</font>
</td></tr><tr valign="top">
<td><font size="1" color="#5f5f5f" face="sans-serif">Sent by:</font>
</td><td><font size="1" face="sans-serif">"RE-wrenches" <<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>></font></td></tr></tbody></table>
<br>
<hr noshade><div><div class="h5">
<br>
<br>
<br><font face="Calibri">We are renovating a 25 yr old off grid
house and one of things being done is to change some 24vDC circuits to
120vac. The only problem that I'm having is finding a low wattage 120vac
to 24vdc transformer for a few strings of 24v LED night lights (a few watts
each string) that are built into some nice hardwood trim in the bedrooms.</font>
<br><font face="Calibri">I just tested the following device and
found that it uses 29 Watts to power a 3W LED. Not an acceptable load for
this house. It is labeled as LED Magnetic Transformer by National Specialty
Lighting part # TR24L20DC-M20L24DC-AR Input: 120vac, Output 24vdc, Maximum
20W</font>
<br><font face="Calibri">Is there anything else available that will
do this job and use a lot less power than 29 Watts?</font>
<br><font face="Calibri"> </font>
<br><font face="Calibri">Thanks,</font>
<br><font face="Calibri">Dave</font>
<br><font face="Calibri"> </font>
<br><font face="Calibri">David Palumbo </font>
<br><font face="Calibri">Independent Power LLC</font>
<br><font face="Calibri">462 Solar Way Drive</font>
<br><font face="Calibri">Hyde Park, VT 05655</font>
<br><font face="Calibri"><a href="tel:802-888-7194" value="+18028887194" target="_blank">802-888-7194</a></font>
<br><font face="Calibri"> </font>
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