Dumb question about "matched transistors"
- Thread starter MichaelW
- Start date
Kroars
Well-known member
Just in case:
2N5951 Quad Set - GuitarPCB
N-channel Jfet 2N5951 Quad Set - Hand Matched - Genuine Tested.
guitarpcb.com
They are out of stock now, but he often updates his stock. I believe I have two sets coming to me, should be delivered in a week or less. I only need one set now, so if you want to send me a message I’d happily send you a set if you need for the cost I bought them for.
Happy building!
MichaelW
Well-known member
Yah, there's a couple places that is selling matched sets, most are out of stock. I'm pretty well loaded up on MMBF5457's, I think I'll try to get my JFet Matcher working right and find a matched set out of my inventory.Just in case:
2N5951 Quad Set - GuitarPCB
N-channel Jfet 2N5951 Quad Set - Hand Matched - Genuine Tested.
They are out of stock now, but he often updates his stock. I believe I have two sets coming to me, should be delivered in a week or less. I only need one set now, so if you want to send me a message I’d happily send you a set if you need for the cost I bought them for.
Happy building!
MichaelW
Well-known member
I think I've tried them. The board clearly makes DSG spots and I matched those. I haven't spent too much time trying to troubleshoot. But I guess now's as good a time as any
I had to order 3 boards from Oshpark. I'm going to try to build out another one.
BryGuy
Active member
I might try these from Aion since I don’t have much of a stash of jfets to sort currently.
aionfx.com
2SK208-GR, matched set for phasers
This is a matched set of 2SK208-GR JFETs for use in phasers such as the BOSS PH-1r, pre-soldered to adapter boards for through-hole applications.
aionfx.com
spi
Well-known member
fig
Village Idiot
I believe that’s what the jFET Matcher Michael has is based on, though there are a few versions (improved, greatly improved, cheetah-supreme). It’s not too deep of math and was fun to work out once, but the online calc is killer. I now use a Peak thingy and it does everything but solder the little bugger for me.
Chuck D. Bones
Circuit Wizard
It's not enough that they are matched. Vgs,off needs to be in the correct range for the phaser to work. 2N5457 has a HUGE Vgs,off range and the ones at the high end won't work. The Vgs,off range for 2N5952 is -1.3V to -3.5V. If you sub other part numbers, make sure the ones you pick have a Vgs,off in that range, preferably near the middle of the range.
fig
Village Idiot
Remember those 2N5248s? I still have all of those matched quads. I never did try any in the Phase 90, but I will now!
Chuck D. Bones
Circuit Wizard
I think you mean 2N5246. Good option. Pick ones with the higher Vgs,off.
fig
Village Idiot
I came back to correct myself and here you've taken care of me. Will do
MichaelW
Well-known member
Hey @Chuck D. Bones, I've managed to come up with 4 matched MMBF5457's but they're a bit higher than your suggested range.
-1.19, -1.19, -1.19, -1.34
Think these will work in a Phase 90?
I've got a crap ton more MMBF547's but they're not mounted on adapters. Got a suggestion on how to test those little suckers?
I can't get my micro clips to stay on the legs.
I suppose to could mount a dozen of them and see if I get any better ones....
swyse
Well-known member
I'm interested to see the results of your experimenting, I'd like to build a phaser at some point but am not excited about matching jfets.
MichaelW
Well-known member
I'll update this thread when I get to building. But you can build the Phase II and skip all this crap
MichaelW
Well-known member
Incidentally, I'm an idiot, I did have them in the wrong way
. There was nothing wrong with the first matcher I built.cool, I'm going try to build that on perfboard, got a small stack of mounted 5457's I hope I can find a pair for to make a 45, and I agree find a mu-tron LED based phaser if you don't want the QA dance finding setsIncidentally, I'm an idiot, I did have them in the wrong way
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