Messages

I got it! Pin 12 of the Compander, it's set to bias the output of the Compander and it's still set for 15V so the compander is putting too much signal back into the feedback path and clipping your delays!

Well at least I think that's what's going on and i'm not about to be an idiot when you both say that didn't help at all.

Right, try half the value of 11k (5k6, 4k7, something round there) and then try again.

I'm wondering about this, is this still the case that R42 is incorrect for 9V operation or was this a red herring?

You're not getting the problems he is with not getting oscillation unless the trims are so high the delays are gritty?

That's exactly my problem.

I guess we need to hear more from Brian, but it sounds like we're not out of the woods as regards the v3205 version yet.

Can you post your IC voltages with your trims adjusted? Maybe this will help LaceSensor to see where he's differing to you?

You're not getting the problems he is with not getting oscillation unless the trims are so high the delays are gritty?

Yikes. I've already soldered a 100K into R21 since it seemed this was confirmed as the fix. C14 is empty so I'll socket that for sure in case.

I guess I'll hold off doing anything else at all until this is all sorted out. I'll wait for more feedback from Brian about the state of his production board with the current R21/C14 100Ks and whether this needs to be reverted and other values installed elsewhere.

Upsettingly R13 is already soldered on my board too. I was really hoping not to have to start pulling out components already.

[Brian]

Brian - when you made the above two circuit subs did you get your v3205 build all biased up and sounding good?

I've just started populating my board and unfortunately have already soldered in R11,R12,R21,R42 after hearing that the fixes were just those 100K subs. Am I going to end up experiencing the same issues?

Making the 100k resistor subs completely solved the distortion issue for me and I was able to bias the two BBDs easily. I have not tried tweaking R42, though.

Thanks for the reply - That all sounds good to me then, sounds like I can continue with my build in hope!

[Brian]

iIve compromised and made R11 12 and 42 as 22k
Now its kinda there.

Dont think this fix is the be all end all personally however.

I'm confused, as far as the up to date document is concerned I thought we were supposed to still use R11,R12 as the 47K specified for the 3205s?

There is also no mention in the document of changing R42 from 11K to 22K, I thought this was just something Scruffie suggested during this debug?

Did you still have dirty repeats with the pedal stock except for changing R21 and C14 to 100K?

Brian - when you made the above two circuit subs did you get your v3205 build all biased up and sounding good?

I've just started populating my board and unfortunately have already soldered in R11,R12,R21,R42 after hearing that the fixes were just those 100K subs. Am I going to end up experiencing the same issues?

Has anyone had success with their build as stock with only those 100K subs on top of the 47Ks in R11/R12 as documented?

Amazing build. Great stuff!

I just started populating my board last night - spent an hour after doing some other builds and only got down the first column of resistors. It's a complex puppy!

Thanks for the build reports and the updates guys - much appreciated - I'm about to start cracking shortly.

Hopefully you guys with the issues will be all good in no time?

Im one of the guys debugging in the tech thread.

for the grapics no I butchered a DMM photo in ms paint to make it.

Ah - sorry I should have noticed that. Hopefully the creases will be ironed out soon, your pdeal looks amazing

Looks amazing!

When making this, did you experience any of the issues that the guys in the Tech Help thread seem to be having? I assume all your parts placements are stock?

I got it! Pin 12 of the Compander, it's set to bias the output of the Compander and it's still set for 15V so the compander is putting too much signal back into the feedback path and clipping your delays!

Well at least I think that's what's going on and i'm not about to be an idiot when you both say that didn't help at all.

Right, try half the value of 11k (5k6, 4k7, something round there) and then try again.

I'm about to start building this for v3205s and have been reading this thread with interest (and trepidation haha) - are you saying the 11k value of R42 is definitely wrong if building the V3205 for 9V operation?