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............
Rail voltages, that 47uF looks a little bulgy to me.
I will pop it out and put a new one in. Thanks for the eagle eyes!
(Says the ol' Albatross.)
I'd take voltages first, it might just be the photo.
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!
Another thought is that maybe somewhere in the dust adhering to the flux could be a tiny bit of metal that settled between two joints at some point.
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.
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