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Old 12th September 2009, 06:27 PM   #2241
RCruz is offline RCruz  Switzerland
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Can a bypass cap be bad ? C6 or C5
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Old 12th September 2009, 06:27 PM   #2242
Salas is offline Salas  Greece
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Definetaly a lick or a bad q2.
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Old 12th September 2009, 06:28 PM   #2243
iko is offline iko  Canada
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Certainly. And since you power the preamp with the shunt, you can take them out to test.
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Old 12th September 2009, 06:30 PM   #2244
Salas is offline Salas  Greece
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Quote:
Originally Posted by RCruz View Post
Can a bypass cap be bad ? C6 or C5
Ricardo, if its not in my hands, and it is a construction or part issue, it also have never been reported before after so many all style builds, you know the procedure. One by one, but the major suspect is the lacquer, since it worked before. Don't know how it dries.
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Old 12th September 2009, 06:33 PM   #2245
RCruz is offline RCruz  Switzerland
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removed Q5 and it measures ok 8.4
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Old 12th September 2009, 06:45 PM   #2246
Salas is offline Salas  Greece
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Q2 is more of interest.
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Old 12th September 2009, 06:49 PM   #2247
iko is offline iko  Canada
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If you allow me a quick OT, I was working lately on a new shunt, which is besides the point really, because what I want to share with you is a little program that I really like. It's called kicad, and it's open source, freely available for windows, linux, etc. It is a schematic capture and pcb design program. It took me about a day to get up to speed with it, but it seems to be powerful and very capable of nice results. I know it's not eaglecad, but I think I like this one more. It even has a 3d view thingy, see attached
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File Type: png reg-v2n-mc-nz-100c.png (21.9 KB, 208 views)
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Old 12th September 2009, 06:53 PM   #2248
iko is offline iko  Canada
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And back to the topic, I'm beginning to suspect the board, like salas. If you have any traces that are close together, you may want to check for tiny solder bits that may short circuit the tracks. I was quite surprised when I looked with a magnifying glass on a board I made once.
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Old 12th September 2009, 06:59 PM   #2249
RCruz is offline RCruz  Switzerland
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working on it... will report latter
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Old 12th September 2009, 07:00 PM   #2250
Salas is offline Salas  Greece
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Thanks Iko, I will download it.
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