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Ill get on that now and report back! Thanks @fig

Welcome to my journey! Let us find salvation together

Ok all! Built the audio probe. It was fun! So here is my update. Audio is present on the input pad. Audio is present on gate of Q1. On Q2 there is no audio present on the gate pin, there is on the drain though. Q3 has audio on the gate. Q4 has no audio at all. Hope this helps!! C

Will do! Did not realize

OK, thanks @fig! I'm learning a lot over here. Im going to build this probe in the coming days and report back.

How would you recommend going about this? Sorry I am a newbie! I appreciate the response!!

Just replaced the LED, that’s functional again. Just probed for continuity, signal passes to the input on the PCB.

I replaced the LED and now it is still not illuminating, or passing any signal. :oops:

The trimpots adjust all voltages on all JFETS. I actually just double checked and in the process the LED stopped working. Perhaps I shorted something? :mad:

This build is especially bizarre because it’s one of the simpler builds I’ve ever done! Please help me people, I need closure! So very stumped.

I had all controls maxed.

I’ll try the probe tonight and I’ll report back! Thank you @fig. Voltage measurements are above, seems like Q2 and 3 and getting too much voltage! If anyone has any ideas of how to address that please let me know.

I didn't no! I got them from Mouser though, so they should be ok right?

@Chuck D. Bones any ideas about this one Mr Wizard?

Hi all! Checking back in from purgatory here. I have now re-wired the foot-switch, Ive re-flowed all solder points (they all seemed fine), and checked all caps, pentameters, diodes and resistors against the BOM, all seem correct. Ive also checked voltages on the JFETs, Q1: 8.8 (at lowest...

Thanks heaps! I just made a separate thread to solicit advice, but basically Q2 & Q3 are both up around 8v at lowest adjustment, so I’m wondering if I’ve got a wrong part in there. There’s photos there too! Have a look if you may. Thanks again, C

Hi again all! Just finished building the Neurocyton. It’s currently passing signal, however it’s a considerable volume drop from bypass when engaged. I attempted to bias the trimmers for the JFETs, these were my measurements. 1) 4.05 2) 8.6 (this was at the lowest setting on the trimmer) 3)...

Many thanks! Ill report back..

Could you talk me through how to bias? Like where to place DMM probes and what setting to have it on? I'm a beginner! Also is it possible that a unbiased pedal would not pass signal? My LED is on, it works in bypass, but not when engaged right now. I can hear the pentameters changing the sound...

Could someone talk this noob through the calibration process? Right now it’s not actually passing signal, but I’m hoping this is the issue