toneburst Posted July 19, 2011 Report Share Posted July 19, 2011 Well, I thought my SammichFM was working perfectly, but I think I spoke a bit too soon. I seem to be getting a nasty distorted output from Audio Out 1/2. The output of out 2/3 sounds fine. Audio from 1/2 seems to be a distorted version of what's coming out of 1/2. Any tips on tracking down the problem? a|x Quote Link to comment Share on other sites More sharing options...
m00dawg Posted July 19, 2011 Report Share Posted July 19, 2011 I'm taking a bit of a guess, but it sounds like one of the op-amps. I would check first to see if those are getting proper voltage. If the op-amp is getting too low of a voltage, it can sound crusty and otherwise distorted, though it may also sound quiet compared to the other outputs in that case. I would start there and work your way backwards. I can't claim to be an expert on the MBFM design though - just thought I'd share what I knew at least of op-amp behaviors I've experienced. Quote Link to comment Share on other sites More sharing options...
toneburst Posted July 19, 2011 Author Report Share Posted July 19, 2011 I'm taking a bit of a guess, but it sounds like one of the op-amps. I would check first to see if those are getting proper voltage. If the op-amp is getting too low of a voltage, it can sound crusty and otherwise distorted, though it may also sound quiet compared to the other outputs in that case. I would start there and work your way backwards. I can't claim to be an expert on the MBFM design though - just thought I'd share what I knew at least of op-amp behaviors I've experienced. Hiya, wow, rapid reply. I'll have a look into that. a|x Quote Link to comment Share on other sites More sharing options...
toneburst Posted July 19, 2011 Author Report Share Posted July 19, 2011 OK, seems to be fixed now. I remelted some of the solder on IC51 and IC53, and all now seems well. Must just have been a bad joint on one of the two surface-mount chips. a|x Quote Link to comment Share on other sites More sharing options...
m00dawg Posted July 19, 2011 Report Share Posted July 19, 2011 w00t! Awesome! Quote Link to comment Share on other sites More sharing options...
bw Posted October 7, 2011 Report Share Posted October 7, 2011 For the record, I just had the exact same problem and resoldering the same two chips fixed it. Thanks! Quote Link to comment Share on other sites More sharing options...
Wilba Posted October 9, 2011 Report Share Posted October 9, 2011 It seems like 9 out of 10 problems with a sammich* are due to bad solder joints/shorts. Thus if it doesn't work, it's probably your bad soldering! just sayin... :wink: Quote Link to comment Share on other sites More sharing options...
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