How to power a halogen bulb?

Question

I asked in another thread about a halogen bulb to light a projector. A particular DIY project site shows the use of a 12v 20w halogen bulb, presumably because that's what the projector they have puts out to the lamp socket. However apparently mine, which is uses 21V bulbs and I find that when I test the socket, it actually shows about 24V.

The idea is to splice the halogen bulb on its own mouting into the wires for the projector's lamp. However, I assume I can't run a 12v bulb on a 24v source, if I can't find a 21v (or 24v?) 20-watt bulb, how would I go about rigging (or finding) an independent 12v (or whatever voltage) power supply for the halogen bulb?

Thanks

petrus bitbyter · Accepted Answer

"HiC" schreef in bericht news:1NfXg.8058$ snipped-for-privacy@newsread4.news.pas.earthlink.net...

Your story is confusing. As for the question, it can be answered straight forward: Every 12V/20W halagen transformer can be used to power a 12V/20W halogen bulb. But... Every halogen bulb is not a projector bulb. Bulbs for slide projectors have a special construction and you will get a disturbed picture when you use an ordinary halogen instead. If you're talking about another projector so *what* projector? Where can we find the site you're talking about? What do you really want to achive?

petrus bitbyter

Homer J Simpson · Answer

21 under load. It'd have a very short life at 24.24 should be available. Don't screw with the power supply.

HiC · Answer

HiC · Answer

messageLook about 3/4 of the way down the page.

James Sweet · Answer

You can get big 12V power packs for LV garden lights and halogen track lighting is popular now, small switchmode converters are available to run 12V halogen lamps, just don't try running non-resistive loads off them, they put out a nasty waveform which only appears to be 12V to an incandescent lamp.

Homer J Simpson · Answer

I have a tabletop folding screen I bought 30 years ago - about 8" * 10". My plan is to project on that and use a camcorder to capture the film to video.

Clive Tobin · Answer

messagenews:3egXg.8066$folding screen I bought 30 years ago - about 8" * 10". MyYou will get much better quality if you forego the screen and use a 1:1macro lens to image the film directly on the CCD sensor. If you aregoing from movie film you need to address the shutter frequency vs.video vertical scan rate issue. If this all gets to be too much youshould just buy one of our Tobin Video Transfer TVT-8 machines.

Homer J Simpson · Answer

I'm sure but I figure for a couple of hundred feet my method will do. I may have to jink the speed on the projector if strobing is too annoying.

HiC · Answer

Can you give a link to something like what you're talking about so I have abetter idea what to look for?

James Sweet · Answer

Just go to Home Depot, look in the garden lighting section or the track lighting section. You probably want something like this

Michael A. Terrell · Answer

messagenews:3egXg.8066$tabletop folding screen I bought 30 years ago - about 8" * 10". My   I used to operate and maintain a RCA film chain for a TV station. The RCA TP-66 Film Chain Projectors used a special shutter for the 24 to30 frame conversion, so every fourth frame of film was shown twice.  Wealso had a dual drum TP-35 35 mm slide projector.  It was set up forB&W, but color cameras were available, as well.-- Service to my country? Been there, Done that, and I've got my DD214 toprove it.Member of DAV #85.Michael A. TerrellCentral Florida

How to power a halogen bulb?

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