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Old 25th March 2004, 04:38 AM   #1
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Default distortion in preamp kit

Hello, i recently built a small preamp kit, and after bulding it, and firing it up, it seemed to have a tremendous amount of distortion. The distortion is plainly audible, and after checking the connections, i noticed that the ground isn't wired correctly.. Could this be the source of the problem?? Or is there something more? What would be the best way to track down this problem?? Tia

Dave
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Old 25th March 2004, 04:47 AM   #2
HDTVman is offline HDTVman  United States
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By all means fix the grounds. That definitely can be causing you trouble.

later BZ
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Old 26th March 2004, 03:04 AM   #3
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Default some preamp work

well today i sat down and set up the grounds properly (i think??) But unfortunately there is still massive distortion What's the next step in trying to fix this problem?? tia

Dave
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Old 26th March 2004, 04:31 AM   #4
HDTVman is offline HDTVman  United States
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Do you have any test equipment? A signal generator, volt meter and oscilloscope are very handy to have at this point.

Later BZ
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Old 26th March 2004, 06:09 PM   #5
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Default equipment

I don't think i have any of that stuff, but there's a possibility of a voltmeter.. What are the options at this point?? tia

Dave
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Old 26th March 2004, 10:28 PM   #6
HDTVman is offline HDTVman  United States
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Well Dave, I or anyone else for that matter need to know more about the circuit. Just what preamp is this, a circuit diagram would help a lot. A disciption of what the distortion sounds like would help too.

You need some way to make a few measurements to find out what is going on with the circuit. With out that anything I or anyone else says would just be a wild guess.

Later BZ
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Old 29th March 2004, 01:01 AM   #7
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Default schematic for preamp

Hello, here is the schematic for the preamp. Also, I just found the voltmeter, so hopefully this will be helpful Thanks
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File Type: jpg schematic.jpg (51.9 KB, 385 views)
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Old 29th March 2004, 01:07 AM   #8
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Default distortion description

Here is the what the distortion sounds like- when you first power up the preamp, everything is quiet, and then if you start the music, it plays fairly cleanly for a few seconds. After that, the sound becomes very garbled and disgusting sounding. Hope this helps! Tia

Dave
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Old 29th March 2004, 01:16 AM   #9
Magura is offline Magura  Denmark
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I once had a similar problem. It was caused by a dead capacitor.

Magura
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Old 29th March 2004, 01:38 AM   #10
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Default dead capacitors?

Hi, if there is a dead capacitor, how would it be tracked? There aren't too many of these, so even if it required some kind of testing for each of them (there are 12) it wouldn't be bad Thanks!

Dave
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