Recent content by zeropluszero

Ok, built 10 more jfets, built a jfet tester, found the 4 closest to each other and it seems to be working now. Jfet drives can suck it.

which is precisely why I dont have one. fuck that noise.

Id basically just like to build a metalzone

Ok, it's not complete...I have gain working until about 1230, then it starts getting very spluttery and gated, some signal still passes all the way clockwise though just super spluttered. Definitely improved.

OK, I may have got it working. Here's what I did. I resoldered (for the third time) all the transistors. I checked the six SMD j201 I had in my TC1. I noted the results. Noting that #2 and 3 had different values than the rest for Idss, Vg. I took these out, and put the other 4 in, I know this...

yeh 4.7K brown, brown, black, purple, yellow - 1% resistors. -If I put in a 5.6K resistor to R6, I get 4.08v on R101, 4.17v on Q5, and gain on minimum - 6.3v on Q6. a 6.8K gives me 6.6 on Q6

Ok, checked over all my resistors and capacitors, and they're all correct to build doc. I measured bottom of R101 at 4.1v, and the side of Q5 ant 4.3v, the right of Q6 gave me a reading around 8.1V Guess I should first pull out Q6 and resolder or replace it? Check stash - of course no spare...

No to the audio probe, this is looking like the project that is going to make me make one I think🙁 I'll take some measurements and get back to you Erik. Does the behaviour I'm describing, where when the pedal turns on I can get a bit of sound from 7-10oclock gain, but then after a few minutes...

new tl071 in, no change. bummer.

Ok so yeh, if i measure without power, the gain pot appears to be working as its supposed to. have a new tl071 in the mail...

Thanks for that. I'll measure again tomorrow.

soldered in some new measurement wires, the blue outer wires seem to work fine, 0 to 250K ohm the inner ones measure 0 and at about 9 oclock drop into overload. so I'm guessing the pot is busted.

Dammit I already see it...the measurements of the inner I thought I was taking were the blue inner and white outer. I'll try again tomorrow 😴

I built a cobalt drive. The 250K dual pot was purchased from pedalpcb, and has some weird behavior. I'm aware of the J201 biasing issue with this pedal, I'm hoping for some other info before i get to that. So far, the build is stock. I had played around with R6 for biasing, but have put it back...

I just used this on my heterodyne (https://forum.pedalpcb.com/threads/zeros-various-pedal-builds.21780/post-318418) I just wanted to say I really appreciate it @markuus