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 LED on DS1 not working		  New Topic  Reply to Topic
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Plectrum_Fingers
Copper Member

United Kingdom
15 Posts
Posted - 10/03/2006 :  16:00:21  Show Profile  Reply with Quote
I've recently modded my DS1 and as I was carrying out the mod I noticed the LED wasnt working anymore. I've tested the LED and it works fine.

Any ideas as to what the problem could be?

Thanks

bossarea
Forum Admin

United Kingdom
3652 Posts
Posted - 10/03/2006 :  16:18:32  Show Profile  Visit bossarea's Homepage  Reply with Quote
It depends a bit on how old the DS-1 is. If there's a zener diode between + and the LED, check that it's ok. There's might also be a driver transistor for the LED that could be broken.

Do you have a schematic? The one on http://www.godiksennet.com/images/sch/DS1PG2.jpg is for the pre 1994 type so it might not match all DS-1s.
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stahlhart
Platinum Member

1318 Posts
Posted - 10/03/2006 :  17:28:03  Show Profile  Reply with Quote
Doesn't the LED just read from one state (side) of the switching flip-flop, through a current-limiting resistor?
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bossarea
Forum Admin

United Kingdom
3652 Posts
Posted - 10/03/2006 :  17:40:33  Show Profile  Visit bossarea's Homepage  Reply with Quote
I've seen a few variations on the design. In some cases there's a transistor between the flipflop and the LED while in some cases there's just the resistor.
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Dr. Bob
Moderator

Australia
6593 Posts
Posted - 10/03/2006 :  18:07:33  Show Profile  Visit Dr. Bob's Homepage  Reply with Quote
I don;t wish to insult your electronic skills, but;
Did you possibly put the LED in backwards?
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starr36
Platinum Member

Canada
1172 Posts
Posted - 10/04/2006 :  18:43:59  Show Profile  Visit starr36's Homepage  Reply with Quote
quote:
Originally posted by Dr. Bob

I don;t wish to insult your electronic skills, but;
Did you possibly put the LED in backwards?



ack! sometimes the obvious is painfully overlooked, in electronics.
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