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

[Steve Fay]

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]

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]

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]

Does it make a difference?

Yes it does.

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]

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

 

[Steve Fay]

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]

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

 

[52592]

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

 

[zygibajt]

Does the amp at least work ??

 

[Steve Fay]

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

 

[GRollins]

Honestly, I've got a bunch of mongrel LEDs that I've picked up here and there. Quite a few of them have leads nearly if not identical in length. Life's too short to go fiddling with them. Stick 'em in one way. If they work, great, if they don't, turn 'em around. The one this weekend actually had leads of differing length and I had it right the first time, then tore the circuit down and rebuilt it (power supply for amplifer) slightly differently with the LED in backwards. Cussed and put it in the other way. Worked.
Cussin' is a great way to communicate to a device that it's not doing what you wanted it to do.
Note that I didn't say that the device actually responds to said cuss words, but neither do they respond to polite parlor talk so you might as well cut loose and have fun.

Grey

 

[Cr3ator]

Transparancy is the word!

Most of the times you can see trough the LED and see a difference in the inside between both leads. I belive it was the anode that had a small element inside the led and the cathode a large element. Anyway, once you know this for one LED, it will be the same for the others

For me this works best.

Erik - still working on his Aleph 5 - Hoogma

 

[wuffwaff]

Grey,

using cuss words on a blue led while make it glow red

William

 

[GRollins]

There is an expression here: "to cuss a blue streak" With that in mind, I suspect that if I cuss enough a red LED might turn blue. Given that red ones are cheaper than blue, perhaps I might be onto a money saving measure.

Grey