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SUM (old version) hum workaround

I have an "old" version of SUM which serves me well enough, but does suffer from a bit of noise on the headphone output,. I didn't build it, by the way.


The github folder (https://github.com/Laminim/EURORACK/tree/master/SUM) for this version includes a workaround for the noise, which is simply soldering a couple of caps across a couple of components,


The workaround pdf suggests the use of tantalum caps, which are polarised.


(I was going to attach the pdf but I don't seem to be able to publish this post with it attached)


I think that for the cap across pins 7 & 4 of IC8 should be +ve to pin 4, -ve to pin 7


For the cap between pin 7 of IC7 and +ve of C62, +ve should goto pin 7 and -ve to the +ve pin of C62.


Please excuse me if II'm wildly off here but my brain has turned to custard as I've manage to pick up a dose of c19 this week.


I'm hoping someone can confirm the correct orientation.


thanks very much in advance for any assistance





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st-modular
st-modular
Sep 19, 2024

Hey Clumsy, Connect the positive side of the tantalum capacitor to pin 7 of IC7 and IC8, and the negative side should be connected to ground. Cheers, Stefan

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