TagBoard Jfet Tester

[lego4040]

Help, I'm about to test my j201's and I need a TL071 or Similar. I can't find those in my stash of coarse but I do have a TL082,JRC4558D and NEC5532. A quick internet check says those are good audio subs but I'd like to get a Amen from guys I trust over here. I'll try and do a short video and post today or tomorrow

[Haberdasher]

the rest of those you listed are dual opamps, and those would be okay subs for a tl072.  but a tl071 is a single opamp with a different pin arrangement.  therefore none of them will work as a plug-in sub for your tester.

ne5534, tl071, lf351 are subs but it doesn't sound like you have any of those so you might as well hit tayda up for a 071.  or try the parts jar area in the b/s/t.

[lego4040]

Banging head against wall, I know I have some but that will be ordered on next parts list order. I got the Boneyard PCB in  looks awesome Haberdasher

[shedland]

Hi

Not sure what testing you were planning on doing, but if it were FET matching, this uses a TL072.

[shedland]

It puts the URL in the reply!


http://tagboardeffects.blogspot.co.nz/2012/07/greatly-improved-jfet-matcher.html

[Haberdasher]

huh, yeah that linked one says you can use 072.  the one i etched a long time ago used tl071 so I ass-umed it was the same design, doh!.

Banging head against wall, I know I have some but that will be ordered on next parts list order. I got the Boneyard PCB in  looks awesome Haberdasher

thanks dude

[lego4040]

Hmm, on the tag board site the one I'm looking at and built uses the tl071. I will look at this page again and see if it's a typo. This is for Jfet matching

[lego4040]

My version of build http://tagboardeffects.blogspot.co.nz/2012/07/jfet-matcher.html?m=1

[lego4040]

Ok so I have a TL082 which I'll use for the T072 version. I have another perfect I can use but apparently theirs is this version that uses no Op Amp and is just as good

[lego4040]

So I built the one shedland postedhttp://tagboardeffects.blogspot.co.nz/2012/07/greatly-improved-jfet-matcher.htmland it works  Tim for bed, will post readings tomorrow night after a day of running around. Oh I I built it in a kitty cat can

[EBRAddict]

If you have the pinouts right, I doubt anyone could notice a difference in the TL072, 4558 or TL082 used for JFET matching.

[lego4040]

These are my numbers using the TL802. Switch up for idss and switch down for vps
I'm no guru but I'll use the closest 6 and continue building from there. I've had nothing but setbacks all week. I blew out my ankle and spent evening I ER last week and found out my car was towed this morning  so no we got to get car before we go go to confirmation

[Muadzin]

Maybe the universe is trying to tell you something in regards to the use of JFET's? 


Seriously, that's tough luck. Here's to hoping your luck will improve. Best wishes!

[lego4040]

Well the good thing is that the pedal works. I'm waiting for enclosures to come in so I can trim everything and box it up. The Wampler Pinnacle sounds great, from clean boost to subtle Gain to over the top crunch. I hear ya on the Jfet's tho, I just bought a matched quad of 5457's Jfet from smallbear for the Nom Nom@10 bucks. Yeah, I'll buy a fistful of smd's and make my from now on.