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Old 22nd November 2004, 02:50 PM   #1
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Default 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?

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Steve
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Old 22nd November 2004, 03:40 PM   #2
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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.

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Dan
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Old 22nd November 2004, 04:04 PM   #3
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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.
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Old 22nd November 2004, 04:14 PM   #4
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Default Re: turned on Aleph 1.2,but LED doesn't Light up

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.
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Old 22nd November 2004, 05:38 PM   #5
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The Blue Silicon Carbide types are static sensitive and
can be blown out fairly easily.
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Old 22nd November 2004, 06:14 PM   #6
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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.

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Steve
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Old 22nd November 2004, 09:36 PM   #7
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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
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Old 22nd November 2004, 11:02 PM   #8
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looking from the top of an LED, the leg nearest the flat edge is the negative
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Old 22nd November 2004, 11:24 PM   #9
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Does the amp at least work ??
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Old 23rd November 2004, 01:05 PM   #10
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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
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