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Overunity Machines Forum



300 LED strip >> Need a joule thief schematic with a 555 timer (maybe)

Started by temledog69, May 13, 2012, 03:18:21 AM

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temledog69

#5
May 14, 2012, 10:32:47 PM
but can a JT help me be even more efficient?

IotaYodi

#6
May 15, 2012, 08:11:14 AM
Quotebut 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.
What I know I know!
Its what I don't know that's a problem!

IotaYodi

#7
May 15, 2012, 08:12:52 AM
What I know I know!
Its what I don't know that's a problem!

acmefixer

#8
May 17, 2012, 05:02:50 PM
Quote from: temledog69 on May 13, 2012, 03:18:21 AM
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.

Taylor

#9
May 30, 2012, 03:53:00 AM
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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