turned on Aleph 1.2,but LED doesn't Light up

Steve Fay · 22nd November 2004, 02:50 PM

Hi, late last night I got to the point where I could turn on for the first time my Aleph 1.2,when I did the LED's didn't light up? Is it possilbe they're wired wrong (+,-). I'm using BrianGT first run of boards and there is a + and - on the board but when it came to the LED itself I had to guess at the polarity. Does it make a difference?

Thanks
Steve

dantwomey · 22nd November 2004, 03:40 PM

To the best of my knowledge the anode is (+) and the cathode is (-). On new LEDs just out of the package one lead is longer than the other. The longest one is the anode.

Regards,
Dan

Blues · 22nd November 2004, 04:04 PM

You can test your LED by setting ohm meter to the right ohm range (x10 I think) and placing +lead to anode and -lead to cathode (forward biasing it). Or you can get it to light up with a flashlight battery.

AudioFreak · 22nd November 2004, 04:14 PM

Quote:

Originally posted by Steve Fay
Does it make a difference?

Yes it does.

Quote:

Originally posted by dantwomey
To the best of my knowledge the anode is (+) and the cathode is (-). On new LEDs just out of the package one lead is longer than the other. The longest one is the anode.

Regards,
Dan

Correct.

Nelson Pass · 22nd November 2004, 05:38 PM

The Blue Silicon Carbide types are static sensitive and
can be blown out fairly easily.

Steve Fay · 22nd November 2004, 06:14 PM

Thank you for the quick repelies. The one thing that really through me was that both leads were the same lenght ??? I 'll probley just replace it and may be try a different style.

Thanks
Steve

GRollins · 22nd November 2004, 09:36 PM

I didn't see that you had tried the LED the other way. Just reverse the leads. Chances are fair that the LED is still okay, after all, it's a diode and current doesn't flow if you hook it up the wrong way. I just did it Saturday.

Grey

Oil · 22nd November 2004, 11:02 PM

looking from the top of an LED, the leg nearest the flat edge is the negative

zygibajt · 22nd November 2004, 11:24 PM

Does the amp at least work ??

Steve Fay · 23rd November 2004, 01:05 PM

Thank very much. I swictched the legs around and it worked. Yes the amp works. I've got a groung loop hummmmmm, but I think I know what I did wrong in the amp..? Did I mention how wonderful it sounds. It blows away my Hafler 9500 which is a very good (border line great ) amp.THANK YOU NELSON. One amp compleled (almost, still some metal finishing ete..) and the the half of a speaker,I listen for over two hours even the wife came in and listen. It was that good.

Thank you again
Steve

22nd November 2004, 02:50 PM	#1
Steve Fay diyAudio Member Join Date: Apr 2002 Location: SANDWICH .IL 60 MILES OUTSIDE CHICAGO	turned on Aleph 1.2,but LED doesn't Light up Hi, late last night I got to the point where I could turn on for the first time my Aleph 1.2,when I did the LED's didn't light up? Is it possilbe they're wired wrong (+,-). I'm using BrianGT first run of boards and there is a + and - on the board but when it came to the LED itself I had to guess at the polarity. Does it make a difference? Thanks Steve __________________ Steve F

22nd November 2004, 06:14 PM	#6
Steve Fay diyAudio Member Join Date: Apr 2002 Location: SANDWICH .IL 60 MILES OUTSIDE CHICAGO	Thank you for the quick repelies. The one thing that really through me was that both leads were the same lenght ??? I 'll probley just replace it and may be try a different style. Thanks Steve __________________ Steve F

23rd November 2004, 01:05 PM	#10
Steve Fay diyAudio Member Join Date: Apr 2002 Location: SANDWICH .IL 60 MILES OUTSIDE CHICAGO	Thank very much. I swictched the legs around and it worked. Yes the amp works. I've got a groung loop hummmmmm, but I think I know what I did wrong in the amp..? Did I mention how wonderful it sounds. It blows away my Hafler 9500 which is a very good (border line great ) amp.THANK YOU NELSON. One amp compleled (almost, still some metal finishing ete..) and the the half of a speaker,I listen for over two hours even the wife came in and listen. It was that good. Thank you again Steve __________________ Steve F

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22nd November 2004, 03:40 PM	#2
dantwomey diyAudio Member Join Date: Feb 2002 Location: Canada	To the best of my knowledge the anode is (+) and the cathode is (-). On new LEDs just out of the package one lead is longer than the other. The longest one is the anode. Regards, Dan

22nd November 2004, 04:04 PM	#3
Blues Lightning In A Bottle diyAudio Member Join Date: Sep 2003 Location: Bremerton, WA	You can test your LED by setting ohm meter to the right ohm range (x10 I think) and placing +lead to anode and -lead to cathode (forward biasing it). Or you can get it to light up with a flashlight battery.

22nd November 2004, 05:38 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	The Blue Silicon Carbide types are static sensitive and can be blown out fairly easily.

22nd November 2004, 09:36 PM	#7
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	I didn't see that you had tried the LED the other way. Just reverse the leads. Chances are fair that the LED is still okay, after all, it's a diode and current doesn't flow if you hook it up the wrong way. I just did it Saturday. Grey

22nd November 2004, 11:02 PM	#8
Oil diyAudio Member Join Date: Aug 2004 Location: Midlands, UK	looking from the top of an LED, the leg nearest the flat edge is the negative

22nd November 2004, 11:24 PM	#9
zygibajt diyAudio Member Join Date: Jun 2003 Location: Wroclaw	Does the amp at least work ??

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