Thanks !fozziemusic wrote:Very nice actions so far! I'm quite an electronics newbie, so I'm unsure whether I can answer all questions, but tracing out leads with a dmm should be doable .
What i'm asking for is fairly simple. I had to make suppositions about the copper traces that run under the components (either in the shadow of electrolytic caps, hard to see under silkscreen despite the high quality pics, or worse, under the integrated circuits). I've highlighted these supposed traces in contrasting color on the images above, and they have to be checked. This can be done visually for some of them, and electrically for the ones that run under components. Just use your multimeter in "beep" mode, and touch both ends of a trace containing orange (or green) portions on the pictures above.
If it beeps, i was right. If it doesn't, there might be another pin nearby that does, and the supposed trace shall be corrected.
I think that i've already corrected most of them by comparison with available Memory Man schematics, and likeliness of the routing (shortest path for example). Verification is still welcome !
It has a grey band with "minus" signs, towards the negative lead. This is about the only marking on the electrolytic caps to be seen on the pictures ...fozziemusic wrote:How do I see whether a cap is polarized?
It looks like only C20 doesn't have one, so i wonder if it is a non-polarized cap. It might have a "NP" marking.
Anyway, looking at the values of these caps is more important !
About the original questions :
- Against clock noise, i'd try first to shield or separate the cables that run from the main board to the IO board. There are adjacent wires that carry audio to/from the jacks and LFO signal to the chorus/vibrato switch, the crosstalk might come from there.
- About Delay CV, i'd try a vactrol (or homemade LED+LDR+heatshrink) in parallel of the Delay pot, which is wired as a variable resistance.
(btw, is there a way to update files, in order to keep the thread fit ?)