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Here's a question that I haven't seen addressed anywhere yet. Does it work on your test rig? All of your posts so far make it seem like you've boxed it up already. Maybe there's a wiring problem.

No, unfortunately it doesn't.  They only time I boxed it was to check that everything would fit per drilling template.

Adjusted Bias tonight.  ALL voltages check out, almost the exact same as build document.  So obviously there was a bit of solder/wire clipping causing my wacky voltages in IC4.  So that is fixed.

BUTTTT.....

Still no sound.  Works fine in bypass.  Led lights as it should.  Just. No. Sound.  I have built probably 25 pedals, and this one is completely dumbfounding me.  I was pretty proud of the fact that I have never started a box a of shame....but it might be time.  So sad.

If any of you have a 2 outs, 2 strikes, tie-game in the bottom of the ninth, Home-Run in you, I would sure like to hear it.

This is most likely because the BIAS is not properly adjusted. Make sure R32 and R35 are correct values and that you used a 20K trimmer for the BIAS. If you get the value on Pin 3 close to the build doc value then Pins 7&8 "should" fall into line.

Also, since you are seeing better voltages on your IC4 then you "should" be getting a good LFO.

Excellent info.  I will look into this tonight.  Thanks

Are all of your other voltages on par with the build document? Other than U4.... Pins 1, 2, and 3?

I need to remeasure.   Yesterday I popped off all of the IC's and blasted the PCB with a high pressure air-hose.  After re-assembly my voltages on IC4 went from the 2.1s up to where they were supposed to be per the build document.  I didn't measure everything else after that.  Hopefully tonight.

The only other wonky voltages from the other night were:

IC9
pin 3 measured at 12.48 which is double what it should be.
Pin 7 and 8 measuered at 9.2, which is also double what it should be.

Mine works great at 18 volts once I got rid of the zenner diode. Oh, and a bad mn3007 (not sure if it was already bad or the result of something in did).

It's a great sounding flanger

Excellent, thanks! Do you have any pics of your board? 

I didn't get a chance to do much troubleshooting on this one last night, I was too busy having my mind blown by a just completed Moodring build.  What a great pedal.  If I can get this one to sound half as good as that one...

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After doing some searching, has anyone actually verified that the 18v mod actually works?

Are 3 and 2 on your manual pot soldered together?

Whoops, sorry.  Too early this morning I guess, I thought yours was 18v.

Thanks for the link, I saw that yesterday.

Good Luck on yours, I can't really offer too much until I get mine working.

I am having problems with this 18v build as well, but I am getting no sound whatsoever.  Thanks for the q1-q5 voltages, I will compare them to mine tonight.

I also have a low voltage on leg 1 of ic7.

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Replaced the 4558.  Here are some pics as promised:










Thanks for your help.  Gonna go cry myself to sleep now.

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R26, R27, and R47 checked out last night.  I am wondering if I have a bad 4558?

I will try pop a new one in there tonight and see.  If not, I will take pics and post them.

Thanks for your help.

No Luck tonight. 

I have some messed up voltages on IC4.1-3

It's supposed to be
1-7.06
2-7.06
3-6.99

I am getting:
1-2.195
2-2.195
3-2.179

Checked my values and me soldering and everything checks out.  There must be something I am missing but I can't figure out what it is.

Also, there is still an error in the voltages. IC6 Pin 5 should be the same as Pin 2. On the document... Pin 5 is listed as 0 but it should be around 7.5V just like Pin 2.

Good luck 

The google machine actually found that post for me that you had made previously, but thanks again.  I was reading the schematic(as best as my abilities allow) and I thought that the 0v was a little curious.

Also, on the drilling template, the holes for the pots could be moved south.  As it is the out-jack hits the feedback trimmer and the plug can't latch.  I can measure when I get home, but I wanna say it was right around .200 south, or so that the board is ALMOST hitting the 3pdt.

Thanks again for the info, I almost went home on my lunch break to try it out.

Hopefully the build document can be updated.  That would have saved me a ton of frustration this weekend.

No, I didn't!  Well, that will probably make things much easier. 

I have been searching Google for the last three days, and this never came up.

Should have searched the forum, that was dumb on my part.

Thanks a ton!