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Old 5th May 2004, 04:51 PM   #1
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Unhappy Rod Elliot's Clipping Indicator

A few days ago, someone asked me to make him a few clipping indicator PCBs. Of course I agreed, but I still needed to test if my PCB layout is OK and if everything is working as it should.

So, today I hooked up the circuit and the clipping indicator led just kept shining, no matter what I did. I have been simulating the circuit for the last 2 hours, but I can't get anything decent out of the simulator. I've just checked my PCB layout for the 8th time or something. I've been fidling around with power supply wires and the PCB for more than an hour, still the led keeps shining, no matter what.

Now, my question is of course if anyone can help me out.
This is the clipping indicator I'm talking about: http://sound.westhost.com/project23.htm
Here's my PCB layout: http://members.lycos.nl/anthonyvh/in...?page=clipping

Help .
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Old 5th May 2004, 05:59 PM   #2
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Check the transitors, be sure that you have npn and pnp. Is Q2 layed out correctly?
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Old 5th May 2004, 08:17 PM   #3
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I'll check them once more (tonight or tomorrow). Everything should be OK, since I soldered everything as shown on the PCB layout. I could of course have switched Q1 & Q2 by mistake... I hope it something stupid like that.

But, to be sure. The LED shouldn't turn on when I apply only +V & Gnd right? It should only turn on if I:
- 9V to +V
- -9V to -V (not really necessary, since inputs are DC in my test)
- Gnd to Gnd
- 9V to on of the the inputs

Correct?
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Old 7th May 2004, 09:38 PM   #4
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I checked everything once more and I can't find anything wrong. Could someone please take a look at my PCB? You can find the layout on my site. It's quite simple, so I don't think a bigger more detailed version is necessary, but if someone would want it, please tell me.
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Old 31st May 2006, 06:57 AM   #5
pejinm is offline pejinm  Serbia
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Hi Devil_H@ck,

Did your clipping indicator worked?
Could you please post the pcb layout in larger pic, .pdf or in eagle .brd file?

Thanks in advance!!!

Regards,
Miodrag Pejin
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Old 31st May 2006, 08:12 AM   #6
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Guys, please don't publicise working PCB layouts for Rod's circuits. His pcb sales are the only thing that keep his valuable site online, and we wouldn't want to lose a resource like that would we?

Oh, and Devil_H@ck, have you thought about asking on Rod's forum?
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Old 31st May 2006, 08:16 AM   #7
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Quote:
Originally posted by pinkmouse
His pcb sales are the only thing that keep his valuable site online
.... he lives on it too....
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