[sdiy] Jomox M Resonator broken ?

René Schmitz uzs159 at uni-bonn.de
Sun Jan 12 14:29:07 CET 2014

Am 11.01.2014 17:44, schrieb Jean Bender:
> My friend sent into it a really hot signal from a circuit bent toy..
> And it destroyed the left channel, sorry, i forgot to explain how it
> came..
> 2014/1/11 Jean Bender <lofideadbeat at gmail.com>:
>> Hi !
>> A friend gave me its M Resonator. The left channel seems to not work
>> anymore. If you plug into it something, there's only a distorded audio
>> signal. If you plug an instrument into the right chanel, you can get
>> the effect working.
>> To me, it seems that the channel 1's filter part is not damaged, but
>> i'm not really sure as i never use this unit when it worked.
>> I think that the preamp part is dead.
>> Would somebody have an idea for helping me restoring this unit ? Do
>> you think Jomow would gave me schematics ? i opened it up, and there
>> are not so many components in it, mostly TLO74.. but it's smt.
>> What should i test first ?

Apply a signal, and follow the signal path from the inputs. Most likely 
only one of the input opamps is fried. You can use the working channel 
for comparison.


uzs159 at uni-bonn.de

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