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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Gated comparator pesky LED
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neandrewthal



Joined: May 11, 2007
Posts: 672
Location: Canada

PostPosted: Sun Aug 10, 2008 9:41 pm    Post subject: Gated comparator pesky LED
Subject description: Bugger won't light
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My gated comparator is working 100% except the LED for the second shifted output. This is odd, as the gate for that stage passes right through the LED and out the jack perfectly, yet it won't light. I made sure it was connected properly(and even lit it up) with my multimeter. I changed it with a new one and still, nothing. What could be wrong Confused Thanks.
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andrewF



Joined: Dec 29, 2006
Posts: 1174
Location: australia
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PostPosted: Sun Aug 10, 2008 10:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sounds interesting.
If it doesn't light up but you still get a gate signal, maybe there isn't enough current passing thru.
check the resistor values (don't trust the markings), with a multimeter. Check 2k2 is properly connected to ground and finally consider replacing the transistor.
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neandrewthal



Joined: May 11, 2007
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Location: Canada

PostPosted: Sun Aug 10, 2008 11:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

andrewF wrote:
Check 2k2 is properly connected to ground

Aye! A flaky(literally) solder pad t'was. Bridged it with a wire and she's right as rain. Thank ye kindley!

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andrewF



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PostPosted: Sun Aug 10, 2008 11:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Good
enjoy the gated comp - it is great for triggering drum modules
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