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 Forum index » DIY Hardware and Software
HELP! my MegaPercussiveSynth has NO NOISE!!
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tokyomatik



Joined: Jan 20, 2011
Posts: 148
Location: berlin
Audio files: 6

PostPosted: Sat Apr 11, 2015 4:41 am    Post subject: HELP! my MegaPercussiveSynth has NO NOISE!! Reply with quote  Mark this post and the followings unread

hi! I have some problems with my MPS. I mistakenly inverted the polarity from the psu and some smoke camed out. I replaced all the ICs but now I have no noise; where should I check??
also when i use the mixer the volume is half respect to the direct voice (it was like this also before the short)
and Impact from the mixer is louder than Shell
is it possible to make the Mixer out louder?
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elmegil



Joined: Mar 20, 2012
Posts: 1615
Location: Chicago
Audio files: 14

PostPosted: Sun Apr 12, 2015 7:59 am    Post subject: Reply with quote  Mark this post and the followings unread

I would look at Q2 & Q3 first. All the noise circuitry is on Sheet 1 of the schematics. There are also some other transistors involved in it that seem to be the next likely place to look, but rather than blindly replacing bits, I'd recommend probing for a signal in various places, such as the junction of Q2 & R22, IC1 pin 8, etc.
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tokyomatik



Joined: Jan 20, 2011
Posts: 148
Location: berlin
Audio files: 6

PostPosted: Tue Apr 21, 2015 3:45 am    Post subject: Reply with quote  Mark this post and the followings unread

hey thanx....i will start to look around those transistors to see if something is fried.....fish & chips served! Embarassed
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