Amps, lamps and milliamps

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Post by 35Z5 on Fri Dec 28, 2012 1:34 am

The quality of those bulbs is likely slightly above junk...

There are wedge based #37 automotive bulbs that may work for you, those are approx half size of a #194 and have a 1500 hour rating at 14v, so should last far longer at 12V... They are surely a better quality than the offshore stuff, and can get them at about any auto parts store... Main issue is you probably won't be able to solder to the leads, but I'd think carefully wrapping a solid piece of #22/24 wire would be OK... I've had one in a tuner/amp I use out in the garage for a couple years without issue...

http://www.topbulb.com/find/Product_Description.asp?intProductID=41744

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Post by Guest on Fri Dec 28, 2012 7:33 am

I think the bulb life will increase with the use of DC voltage. AC voltage accually destroys the filament in the same way you do to a piece of metal by bending it back and forth.

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Post by Resistance is Futile on Fri Dec 28, 2012 1:21 pm

terrydec wrote:Wow! So, will it work?
Only way is to experiment. But realize if they work you may not like the results. They Short Out and you don't want that if you value your transformer. To burn up a transformer for a cheap bulb? I seriously don't think you want to do that!
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Post by terrydec on Fri Dec 28, 2012 1:47 pm

I've tried soldering a lamp with mixed results, especially the tip. I've usually had more success with higher voltage bulbs. I'm also thinking that, once again, after going through all of the trouble a 14 volt lamp might not be bright enough.

I apologize if I have put everyone through all of this trouble only to ignore all of the advice. After 4 pages the bottom line seems to be that just replacing the bulbs as they burn out is the best approach.
However I have learned a lot and made copious notes. Running the thread was worth that if nothing else.
Thanks to everyone for their input.
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Post by Resistance is Futile on Fri Dec 28, 2012 5:02 pm

Here's a little math I added to my forum.
If you have a calculator it would be the easy way to follow and get an Idea, no complex math per say.
Click Here.
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Post by terrydec on Fri Dec 28, 2012 6:30 pm

Cool-
I was able to copy and paste it in a word document for future reference.
Thanks.
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Post by Resistance is Futile on Fri Dec 28, 2012 9:56 pm

Please recopy as I had a few errors to work out, but its finished now. sunny
I would like to do some experiments with that on smaller lamps. I know when I took my first Industrial Electricity and electronics class at Long Beach City College we used experiments with capacitors to learn about reactance, capacitance, and used prove reaction, frequency, voltage, time, phasing used to dim light bulbs. A lot of fun. This was back in 1962.
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