There's 2 levels of OCD
1) Being OCD about details that make the biggest impact on the end result.
2) Being OCD about details that matter very little to the end result.
I recognise I am OCD about this stuff but I try to be intelligent about it
Then there are other "people" who are just OCD, and aren't even aware they have it.
These types usually fall into category (2).
Hahahahaha
1) Being OCD about details that make the biggest impact on the end result.
2) Being OCD about details that matter very little to the end result.
I recognise I am OCD about this stuff but I try to be intelligent about it
Then there are other "people" who are just OCD, and aren't even aware they have it.
These types usually fall into category (2).
Hahahahaha
Alternatively open the bloody multimeter inspect what current sense resistor is used and bloody upgrade the current sense resistor to something good.
You now have a good Ammeter using a current sense resistor of known quality.
BOB's YOUR UNCLE
you're clueless bstrd
everybody around knows that Bubba Flocchini is my Uncle
as I said, my OCD stops at Green LEDs; still waking from one repeated nightmare, why I didn't include them in few constructions!!
Hmmm. Any ideas on where to get them? I was going to be content with IRF150..... last thing to solder today. tapped heatsink
And where did you get that jig for holding the fets?
Gift from Papa?
NIANNIANXINDIANZI SOT23 6L SOT23 To DIP6 IC Programmer Adapter Chip Test Socket|ic socket|ic chip - AliExpress
these are depletion parts, while Semisouths used here are enhanced
depletion are like triode - normally ON , enhanced ones are normally OFF , so their governing voltages (Ugs potential) are opposite in sign
anyway, we like depletion ones (in other circuits) but IJW, you posted link to, is having Ugs greater than (-) 10V for Iq of our interest, and that's complication - you need either elevated rail for that difference amount (difference between regular part Ugs and this one Ugs) or to introduce auxiliary rail, if possible in construction
edit: though, it can work in circuit as Singing Bush, without penalties - there is already auxiliary circuit for biasing, so no biggie
send me a pair and I can test them in vivo in Mighty SB , why not
depletion are like triode - normally ON , enhanced ones are normally OFF , so their governing voltages (Ugs potential) are opposite in sign
anyway, we like depletion ones (in other circuits) but IJW, you posted link to, is having Ugs greater than (-) 10V for Iq of our interest, and that's complication - you need either elevated rail for that difference amount (difference between regular part Ugs and this one Ugs) or to introduce auxiliary rail, if possible in construction
edit: though, it can work in circuit as Singing Bush, without penalties - there is already auxiliary circuit for biasing, so no biggie
send me a pair and I can test them in vivo in Mighty SB , why not
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I appreciate the quick reply ZM. Thanks for the explanation.
Perhaps I should stick with my original idea and enjoy what I have.
Dont want to exchange one eol for another eol.
Perhaps I should stick with my original idea and enjoy what I have.
Dont want to exchange one eol for another eol.
Howdy ZM - first channel installed and all is looking good. Only thing I’m running into is that I’m running out with P101 before I can get to offset. I still have around 75mV. Can you recommend a value adjustment for (presumably) R118? I’m running SS in both spots.
@twitchie - thanks for link! Just found and ordered from fleabay. Too bad I have to wait a few weeks to get it. We’ll see if I have the patience. 😉
@codyt - I only bought two Semisouths, so I’m only going SS down. To satisfy my matched quad appetite I have a quad of 2SK182ES on the way from Japan. 😀 But that’s another amp altogether. 😛
@codyt - I only bought two Semisouths, so I’m only going SS down. To satisfy my matched quad appetite I have a quad of 2SK182ES on the way from Japan. 😀 But that’s another amp altogether. 😛
@codyt
offset positive, so you need more to open lower SS
for that , increase R118 for half value of P101, so 1K is good
before powering ON again, back up with P101
offset positive, so you need more to open lower SS
for that , increase R118 for half value of P101, so 1K is good
before powering ON again, back up with P101
Thanks! Looks like I may run out of bias pot too. Measuring 800mV at 1R source with pot maxed. Is there I value I should change there too?
twice 1R means you have 1A6 there
fine to stay here
in case that you insist - just increase R123 value for half value of P102
boy, you got some highish IRFPs there ....... 🙂
fine to stay here
in case that you insist - just increase R123 value for half value of P102
boy, you got some highish IRFPs there ....... 🙂
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Of course I don’t have the patience to what for the testing jig. I’m sure it will come in handy again though. Revised my jfet sorting tray. I drilled a series of 5/8” dia. holes halfway into a piece of wood flooring with a forstner bit. Thanks for the idea ZM. Starting from the beginning testing until the reading settles. We’ll see how long it takes me to get through 50 jfets. 😀
