Problems with a ROG Double D

[svstee]

Recently built the ROG Double D dual channel distortion. Used a 2nd 3pdt with LEDs for channel select as shown at the end of the article.
http://www.runoffgroove.com/doubled.html
Used this vero layout for the board.
http://www.aronnelson.com/gallery/main.php/v/Toneys-Album/double_D_v5.png.html

A fun build and it worked (mostly) the first time I plugged it in, and now for the problems.
The Bounce channel is LOUD. I have the volume on 2 or 3 and the effect is noticeably louder than bypassed. Is this normal?
The Jiggle channel is way too soft. with volume and gain both at 10 it is still way more quiet than bypassed signal and it also doesn't sound quite like the clip at ROG, mine is more buzzy with less definition.

What exactly does the trimpot in the layout do? To me it seems like it is controlling bias for the J201 on the Jiggle channel, but when I was tweaking it it seemed to be affecting the Bounce channels gain.
Is it something to tweak by ear or should I be aiming for a specific voltage on Q1's drain?

Thanks!

[anchovie]

If you're thinking that the J201 with the trimpot only affects the Jiggle channel, are you sure you're interpreting the schematic correctly and therefore have your switch wired properly? It's a gain stage that occurs before the switch, so the output of it goes to the gain pot of whichever channel you're switched to. The trimpot should be adjusted to provide half of the supply voltage at the drain of the FET.

Both channels should be significantly loud at max volume compared to bypass, as there is no attenuation other than the volume pots and the 4049 gain stages will be swinging between ground and supply voltage. Adding tonestack(s) would bring the volume down but still allow greater than clean.

[svstee]

If you're thinking that the J201 with the trimpot only affects the Jiggle channel, are you sure you're interpreting the schematic correctly and therefore have your switch wired properly? It's a gain stage that occurs before the switch, so the output of it goes to the gain pot of whichever channel you're switched to. The trimpot should be adjusted to provide half of the supply voltage at the drain of the FET.

OK, I see that now. I made a poor assumption I think.

Both channels should be significantly loud at max volume compared to bypass, as there is no attenuation other than the volume pots and the 4049 gain stages will be swinging between ground and supply voltage. Adding tonestack(s) would bring the volume down but still allow greater than clean.

This makes me think I have an error somewhere. The Jiggle channel is making an awful crackling noise now as well.
I haven't added any tone stacks, I figure since it seems this circuit has plenty of treble already I could just use my guitar's tone knob to roll some off if needed. There must be some problem with the jiggle channel since the bounce one and bypass seem to work fine. Does anyone have a set of voltages I can check against?

Thanks!

[tackleberry]

I built a DD but put a tone knob on each channel so the output volume isnt so high. The tube sound fuzz I built with the same 4049 IC was really really loud but didnt have a tone stack. And the jiggle channel is quieter due to using only 2 vs 3 inverters. I had to make some changes to mine like reducing the 470k resistor between the gain stages on jiggle side for more output. And adding a bypass cap on the gain pot to keep some of the highs. I also made changes to the caps to refine things, the bounce channel seemed to muddy for me so used smaller caps. I socketed em all and tweaked em for some time to get what I wanted.

[svstee]

I have voltages!

Q1
D: 4.65
S: 0.12
G: 0.00


Q2
D: 9.26
S: 0.52
G: 0.01

U1
1: 9.26
2: 8.50
3: 4.50
4: 3.88
5: 3.41
6: 9.25
7: 0.00
8: 0.00
9: 3.28
10: 4.48
11: 3.46
12: 3.43
13: 0.00
14: 3.20
15: 3.40
16: 9.26


Does that help any?

[svstee]

bump

[anchovie]

I think you need to audio-probe this one to find at which gain stage the signal gets messed up.