Matching JFets for first time

[Aentons]

Ok, I figured it out... out of frustration I started pushing on the opamp in different sideways directions and finally got a reading. So I measured power directly on both the opamp legs at the same time and got nothing.  The opamp power legs were not making contact with the breadboard. I spread the legs out and added some kinks and it's fine now. Totally lame...

[Aentons]

Thanks for your help Jacob and Jimi!

Screenshot is attached of how it turned out. They matched a lot closer than I thought they would. All within -1.21 to -1.51v range

[Aentons]

Here is the distribution. Looks like there might be some matches in there.

[jimilee]

Nicely done. Those all measure relatively low, where did you source them?


Sent from my iPhone using Tapatalk

[Aentons]

Nicely done. Those all measure relatively low, where did you source them?


Sent from my iPhone using Tapatalk

I got them from Mouser recently. They are pretty much right in the middle of the range stated in the datasheet which is -0.5 to -3.0v.

[jimilee]

Nicely done. Those all measure relatively low, where did you source them?


Sent from my iPhone using Tapatalk

I got them from Mouser recently. They are pretty much right in the middle of the range stated in the datasheet which is -0.5 to -3.0v.

Oh yeah, they're definitely in spec. I was thinking for phasers, that's just where my mind goes. You should have some good ones for a VFE bumblebee in there.


Sent from my iPhone using Tapatalk

[Aentons]

Yep, Hopefully I'll be good for the bumblebee. The goal was mainly to get vgs off matches for the tractor beam and other future phasers but I'm not really sure if it's good/bad to have high/low values. All I know is that I've read that the lfo sweep turn-around strength is good if they match to +/- 0.02v

[Aentons]

Here are some other randoms from other sources that I measured.

[jimilee]

Yep, Hopefully I'll be good for the bumblebee. The goal was mainly to get vgs off matches for the tractor beam and other future phasers but I'm not really sure if it's good/bad to have high/low values. All I know is that I've read that the lfo sweep turn-around strength is good if they match to +/- 0.02v

That's about what I look for. The tractor beam is a great phaser build. I like the reverse setting.


Sent from my iPhone using Tapatalk

[Aentons]

Yep, Hopefully I'll be good for the bumblebee. The goal was mainly to get vgs off matches for the tractor beam and other future phasers but I'm not really sure if it's good/bad to have high/low values. All I know is that I've read that the lfo sweep turn-around strength is good if they match to +/- 0.02v

That's about what I look for. The tractor beam is a great phaser build. I like the reverse setting.


Sent from my iPhone using Tapatalk

I finally got the matched J113 set into my tractor beam and it sounds fantastic. The phasing is strong with this one

[jimilee]

Yep, Hopefully I'll be good for the bumblebee. The goal was mainly to get vgs off matches for the tractor beam and other future phasers but I'm not really sure if it's good/bad to have high/low values. All I know is that I've read that the lfo sweep turn-around strength is good if they match to +/- 0.02v

That's about what I look for. The tractor beam is a great phaser build. I like the reverse setting.


Sent from my iPhone using Tapatalk

I finally got the matched J113 set into my tractor beam and it sounds fantastic. The phasing is strong with this one

Sent from my iPhone using Tapatalk