LED light . . . im stumped - Page 4 - Electronic Circuits Projects Diagrams Free

zachtheterrible · 29th August 2005, 05:20 PM

So, im having absolutely NO luck with the PCB. It only seems to work on the breadboard. The two PCBs that I have created for this project have not worked at all.

I want to use the one from the chip-torch article, but i cannot figure out how to size it down to the right size. Whenever I try, the quality becomes terrible. Can anyone get it to the right size? I have tried changing the file formats to .gif and .bmp, but the same thing happens.

Dr.EM · 29th August 2005, 08:59 PM

Is that any good? You'd have to tell me the exact size you wanted i though. Alternatively, download "irfan view", it's well worth having anyway.

zachtheterrible · 29th August 2005, 10:53 PM

What is irfan view? Is that what you used to do it?

Oh yeah, i just realized it would be impossible for you to give me the right size without actually printing it out and stuff. ill have to do it on my computer.

Dr.EM · 30th August 2005, 11:18 AM

Irfan view is a free program that nobody should be without in my opinion, it solves most image problems there are. Yep, its what I used.

http://www.irfanview.com/

zachtheterrible · 11th September 2005, 06:22 AM

I ALMOST had this thing finally mounted and working in a flashlight (i got the PCB to work), when i blew out another $11 LED!! :evil: :evil: :evil:

I cant believe it! I think what may have happened is that a decoupling capacitor accidentally got disconnected while I was working on the cirucit and it let large voltage spikes through the LED. Do you think that's the problem?

EDIT: I figured out why it burnt out. It was not the decoupling capacitor. When there is no load on the circuit, the circuit produces around 30v. When I connected the LED I saw a small spark. It was obviously enough to zap the LED. The project is almost done though. When I get my next LED, it will finally be complete and ill post pics :lol:

mvs sarma · 1st January 2007, 08:11 AM

Quote:

Originally Posted by zachtheterrible

I just realized that my circuit is oscillating @ 370khz! Almost twice the nominal frequency that the datasheet recommends: 200khz.

Anyone know how to slow it down?

Hi,

I SUSPECT THE INDUCTOR MAY BE PARTIALLT SHORT. PLEASE CHECK.

2. ple check the electrolytic 220uF for leakage.

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29th August 2005, 05:20 PM	#46
zachtheterrible	So, im having absolutely NO luck with the PCB. It only seems to work on the breadboard. The two PCBs that I have created for this project have not worked at all. I want to use the one from the chip-torch article, but i cannot figure out how to size it down to the right size. Whenever I try, the quality becomes terrible. Can anyone get it to the right size? I have tried changing the file formats to .gif and .bmp, but the same thing happens. Attached Thumbnails __________________ I'm no electronics god, i just talk too much.

29th August 2005, 08:59 PM	#47
Dr.EM	Is that any good? You'd have to tell me the exact size you wanted i though. Alternatively, download "irfan view", it's well worth having anyway. Attached Thumbnails __________________ Angry!? I'm absolutely electrolytic! Music web page: http://www.music-playground.net/artist/drem/

29th August 2005, 10:53 PM	#48
zachtheterrible	What is irfan view? Is that what you used to do it? Oh yeah, i just realized it would be impossible for you to give me the right size without actually printing it out and stuff. ill have to do it on my computer. __________________ I'm no electronics god, i just talk too much.

30th August 2005, 11:18 AM	#49
Dr.EM	Irfan view is a free program that nobody should be without in my opinion, it solves most image problems there are. Yep, its what I used. http://www.irfanview.com/ __________________ Angry!? I'm absolutely electrolytic! Music web page: http://www.music-playground.net/artist/drem/

11th September 2005, 06:22 AM	#50
zachtheterrible	I ALMOST had this thing finally mounted and working in a flashlight (i got the PCB to work), when i blew out another $11 LED!! :evil: :evil: :evil: I cant believe it! I think what may have happened is that a decoupling capacitor accidentally got disconnected while I was working on the cirucit and it let large voltage spikes through the LED. Do you think that's the problem? EDIT: I figured out why it burnt out. It was not the decoupling capacitor. When there is no load on the circuit, the circuit produces around 30v. When I connected the LED I saw a small spark. It was obviously enough to zap the LED. The project is almost done though. When I get my next LED, it will finally be complete and ill post pics :lol: __________________ I'm no electronics god, i just talk too much.