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.
Phil On Thu, Jan 29, 2015 at 11:08 AM, <[email protected]> wrote: > Hi: > > 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. > > Here's a link to Hammond transformers of that type, although they are no > doubt available from many sources at most electrical supply houses. > > http://www.hammondmfg.com/ba.htm > > JARMO > > _____________________________________________________________________________________ > > * Jarmo Venalainen* | * Schneider Electric ** | Xantrex Brand* | > *CANADA* | *Sales Application Engineer* > * Phone:* +604-422-2528 | *Tech Support:* 800-670-0707 | *Mobile:* > +604-505-0291 > * Email:* *[email protected]* > <[email protected]> | *Site:** www.Xantrex.com* > <http://www.xantrex.com/> | *Address:* 3700 Gilmore Way, Burnaby, BC > V5G4M1 > <http://www.xantrexrebate.com/> <http://www.xantrex.com/> > <https://www.facebook.com/Xantrex> <https://twitter.com/Xantrex> > <https://twitter.com/Xantrex> > > > *** Please consider the environment before printing this e-mail > > > > From: "Dave" <[email protected]> To: "'RE-wrenches'" < > [email protected]>, Date: 01/29/2015 10:58 AM Subject: Re: > [RE-wrenches] Low wattage 120vac to 24vdc transformer for LED's Sent by: > "RE-wrenches" > <[email protected]> > ------------------------------ > > > > 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. > 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 > Is there anything else available that will do this job and use a lot less > power than 29 Watts? > > Thanks, > Dave > > David Palumbo > Independent Power LLC > 462 Solar Way Drive > Hyde Park, VT 05655 > 802-888-7194 > > > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > ______________________________________________________________________ > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > >
_______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
