Nein

For what it's worth, I almost never measure or match JFETs when verifying a circuit.

I initially just blindly install them, usually picked straight from a reel.

If it doesn't work, or doesn't sound right, then I will go back and measure/replace.

The specs in the doc aren't meant to be a strict requirement, they're just what the originals measured.
 
Yeah, I just saw the measurements in the schematic and remembered the troubles some had with the desolate j201s. I also toasted a fet on my lowtide which ended up being my first public troubleshoot.
 
Mentaltossflycoon said:
Yeah, I just saw the measurements in the schematic and remembered the troubles some had with the desolate j201s. I also toasted a fet on my lowtide which ended up being my first public troubleshoot.
Click to expand...
I socketed the biasing resistors in my Desolate only for the first two random J201s to work perfectly with the stock values.

As for the Low Tide, it's got pride of place in my Hall of Shame. Never worked properly.
I have another board for when I'm ready to give it another try.
 
andare said:
I socketed the biasing resistors in my Desolate only for the first two random J201s to work perfectly with the stock values.

As for the Low Tide, it's got pride of place in my Hall of Shame. Never worked properly.
I have another board for when I'm ready to give it another try.
Click to expand...
If I can do it, surely
go-for-it-you-can-do-it.gif
 
crashguitar said:
I didn't test any of the J201s that I used. I am both lazy and don't have a good way to test SMD parts. Turned out fine for me. YMMV :)
Click to expand...
To measure Idss I use a cheap chinese T7 component tester, this is my setup:
jfet_testing.jpg
It works reliably, but i need press down the transistor against the copper tape to create contact. I use that rubber thingie in the upper right of the picture for that.

I've thought about replacing the plate with a small pcb with slightly larger pads than the usual foot print for smd transistors plus test pins,
and I guess it would help if I didn't need to hold down the transistor with one hand. Maybe something 3d printed?

The tester does not get any value for Vp, Vgsoff and such, been wondering if the Id @ Vg values can be used for calculating or approximating them
 
pettert said:
To measure Idss I use a cheap chinese T7 component tester, this is my setup:
View attachment 100603
It works reliably, but i need press down the transistor against the copper tape to create contact. I use that rubber thingie in the upper right of the picture for that.

I've thought about replacing the plate with a small pcb with slightly larger pads than the usual foot print for smd transistors plus test pins,
and I guess it would help if I didn't need to hold down the transistor with one hand. Maybe something 3d printed?

The tester does not get any value for Vp, Vgsoff and such, been wondering if the Id @ Vg values can be used for calculating or approximating them
Click to expand...
Where did you buy this tester? I bought a very similar one but it will not read jfets
 
dot matrix madness said:
Indeed, Same observation here. Seemingly that's a different (newer?) firmware. Shouldn't be a big deal to update that.
Click to expand...
neiltheseal said:
Where did you buy this tester? I bought a very similar one but it will not read jfets
Click to expand...
This seller on AliExpress:

I have an older one too that is good but it doesn't measure JFET and has a monochrome screen. I don't know at which Vds that Idss is measured at, it's not 9V and I don't think it's 3V as in the build instructions.
 
Mentaltossflycoon said:
I was already a big fan of fairfield inspired circuits being a frequent user of the chopshop, lowtide, and desolate fuzz. I figured this wouldn't suck and I was quite correct. The desolate lacks a little low end, even though I greatly enjoy the sounds it makes with bass. This Nein fuzz doesn't have that issue so much, I have no hesitation saying that it's "good" for the bass players. It's also nicely versatile.

I have many fuzzes that I only enjoy with the fuzz dimed but the nein sounds good dialed all the way down into fairly clean territory. The fuzz control and the input control are interactive and you can conjure many textures for a pedal with no tone knob. When maxed out it's pretty huge but it's tame when comparing with the desolate. It kind of does everything the desolate doesn't. The bias control only adds to that versatility providing some gated tones too.

Easy building, found appropriate fets quickly though they all three came from different batches and happen to be soldered in different directions, one with pins, the others with resistor legs. Looks more chaotic than it is.

View attachment 100356View attachment 100357
Click to expand...
Lovely! I'm using one of those JFET breakout boards for the first time; I used spare snipped leads and soldered it to the back of the board instead of the front as you did here (because there wasnt room on the front). This is for an AionFX build. Assumed that that white strip would serve as sufficient insulation against the other joints it touches on the back of the board. Do you think thatll work?
 
flipmodemedian said:
Lovely! I'm using one of those JFET breakout boards for the first time; I used spare snipped leads and soldered it to the back of the board instead of the front as you did here (because there wasnt room on the front). This is for an AionFX build. Assumed that that white strip would serve as sufficient insulation against the other joints it touches on the back of the board. Do you think thatll work?
Click to expand...
I'm pretty sure the white strip is just for labeling but you should be good to solder in your leads in whatever direction you need.
 
Man i just finished my board. Tried it before boxing.

This thing is fucking awesome. “Testing” was at least an hour. I might have a new favorite pedal.

And i just used sine smd j201’s no measuring etc. cant really imagine it sounding any better.
 
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