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Author Topic: 300 LED strip >> Need a joule thief schematic with a 555 timer (maybe)  (Read 17326 times)

Offline temledog69

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http://www.amazon.com/Flexible-LED-Ribbon-LEDwholesalers-2026ww-31k/dp/B002QQ48TK

this is the strip I want to light up and make efficient with a joule thief..... but I never made a thief and dont know what to do or how to approach this strip. THe strip will be used in a fish house and I would love some help....

ty
Tdog

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Offline temledog69

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ok ok , its not for a fish house, its for living in a Van....

is what I talk about even possible

Offline temledog69

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whats the most efficient way to light my van? 10 feet long... ?

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Offline WilbyInebriated

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if you use a jt style circuit to light leds/fluoros in a fish house be aware that it might affect the operation of your vexlar/markum.

Offline IotaYodi

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A small car battery is around 45 amp hours. Thats over 40 hours running 1 amp. Depending on the audio system you can run a car radio from 2 to 8 hours before the battery runs down. I guess you could have a seperate  12 volt battery and use a solar charger for it.


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Offline temledog69

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but can a JT help me be even more efficient?

Offline IotaYodi

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Quote
but can a JT help me be even more efficient?
Maybe multiple Jts, Havent seen anyone do 300 leds on 1 jt without adding an external grounding system like Pirates.

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Offline acmefixer

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http://www.amazon.com/Flexible-LED-Ribbon-LEDwholesalers-2026ww-31k/dp/B002QQ48TK

this is the strip I want to light up and make efficient with a joule thief..... but I never made a thief and dont know what to do or how to approach this strip. THe strip will be used in a fish house and I would love some help....

ty
Tdog

The advert says it uses an AC adapter that's 12V at 4 amps, which is 48 watts.  Typically this adapter has a rating that's higher than the actual current, but in any case, the strip is going to need 12 volts at probably a few amps.  A safe guesstimate would be 2.5 amps or 30 watts, or about a tenth of a watt for each of the 300 LEDs.

There is no Joule Thief that can supply that kind of current.  You could put 8 D cells in series for 12V, and they would put out an amp or more and last for a few hours, but I don't think that replacing the D cells every week or two is going to be affordable.

Joule Thiefs are only about 40 tp 70 percent efficient, in other words they waste about half the power.  A few months ago I built a high power Joule Thief that runs from 1V and puts out enough current to run a 1 watt LED.  To drive a strip at 30 watts would require at least two dozen of these.  It would draw about a hundred amps from a 1.5 volt supply.  You can immediately see why a Joule Thief is not the answer to powering this strip.

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Offline Taylor

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My case has LED lights on the front but I don't know how to light them up. My case has a cable called "PWR LED" which I figure powers the cases LED lights. This cable had a 4pin male molex at the end of it, I don't know what to do from here.











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