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I know this is an old thread, but I had the same problem,. If you notice on page 9 of the schematic/ build instruction doc, it shows how to hook up an exp jack or how to wire it if you want to exclude this feature. As soon as I wired the jack 'closed' ,the splode mode worked.

ok it looks like i have a 1 meg (code 105)
when I run the multimeter to check the trimmer and am getting a reading that is saying it is good
swapping out chips,,,,,seems the AD 633nmay have been a bit wonky

Ok, I see the voltage list on the print out I had. Sorry.
I notice that the build list has the trimmer at 100k,BUT  looking at the copy of the  schematics I have, it  says 1Mor meg.

is there a reference or list of critical voltage readings/measurements and location for  this  projects? That would be a great tool for trouble shooting!

I will pop it out and put a new one in. Thanks for the eagle eyes!
(Says the ol' Albatross.)

Hello,
Well I built this freekout, Brians most exellent Eh clone, about a year ago and it has been on the ol pedal board for nearly as that long.
Sure enough, I had a friend over and we were jamming and a high frequency pitch is noticable in the audio chain, one I never heard before. After some plugging and un plugging, I have discovered the Freekout pedal is the culprit.
The board is powered by a one spot pro, out of the 18v slot as required. The  high frequency is noticeable  even in bypass mode, and if you diddle the sweep knob,especially in the last quarter turn, it is there. I thought that i somehow bumped the trimmer, moving the boart,to and fro,but no,trying to readjust the trimmer seems not to help, so I set it back in the middle till there is minimal sound, as prescribed in the build. I have not replaced any parts and I am guessing that maybe a component has gone wonky and something is bleeding in? Thanks! I really hate to blow my audition in that all DEVO tribute band............

I am running a one spot for power. 18v 100ma, if that helps.

Scruffie,
Thanks tor the help!
Turning the shift knob, I can hear the freq. in bypass mode, on the counter clock wise rotation/of the shift nob, its not as noticeable, i am guessing because the pitch of the frequency is low, but if you rotate it over to the clockwise position it is obvious.

Hullo all! I have had a mad-bean freekouton the ol' pedal-board for the last year and have had no problems.
Yesterday, I  noticed a super high pitch frequency bleeding out of the amp. Sure enough, it is coming out of the ring mod. it is noticeable even when the   bypass switch is engaged, 'eeeeeeeeeehhhh-ing away in the signal chain. I thought I might have kicked or stomped the ol' box to hard, so I popped her off the board, opened the back and tried to adjust the trimmer pot that I thought I may have some how jiggered. It was not that. component gone bad? What say ye brethren of the soldering gun?

Pedal board,as of June 2017. subject to change,ha-ha!

Harmonic Engine

Phonic Taxidermist

LETRIC-FX  Celeste Chorus /Clone Theory

Electric Druid Multiflange!

loophole. Thanks L'etricfx for the PCB board