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OK.. gonna make an FET board..

but.. what the heck is this prototyping board actually called??

OK.. one more thing....

THe gain pot...

would switching this to 500K give you about half of the overall gain, just bradening the control sweep

(Ie full bore is now 50% of what the 1 meg would give)

Or would it alter the circuit (like switching the volume pot on a humbucker guitar from 500k to 250k  pushes the resonant frequency around)

So you can plug in Fets that are DGS or DSG (check the datasheet for the Fet to find out which way it is) without having to bend the legs. The two drains are linked on the Fet matcher.

Ooooooooooooooo   DUH... I saw that they were linked across the bug board, but the answer was so stupidly obvious that it didnt click....

Thanks!!!

I'm pretty obtuse for a smart guy sometimes....

Ok....   so i know enough about electronics to be  dangerous!!


I see the Jfet tester board has:



Drain - Source- Gate and Drain...


why two drains when a Jfet only has one??

Oh...  and ANY op amp...  i got a few laying around from building Fuel Cut Defense circuits for RX-7 Turbo II's!



PS.. thanks  a lot for the reply, definaly going to build the next one your way

one thing i did note is that the caps i used for c3 c9 and c14 were 1uf multilayer ceramic, and quite tiny compared to others i've seen on peoples builds


while it appears that eveyone else is using the larger, higher voltage film caps,


diference???


(I build guitars...  i usually only deal with three caps, and i usually use vintage PIO's!!)

Hey..  I've been lurkin around a bit, finally got my Chunk CHunk built, it works, and sounds GREAT..


All for nodes set to 4.5V, all controls work..  pot is the 1M Audio taper as on the build sheet.

but the Gain, while great, is pretty much unuseable past 12:00 on the knob...  you only get a very little bit of "break up" distortion just after "0" on the gain knob, and then its right into "tear your face off,, and then melt your face off"

not that this is a bad thing mind you...... but, a little more versatility might be warranted,

I guess the question is..

its is supposed to be like that with the J201's...

would a different value gain pot change things?



I've got a second board all but built, but I'm thinkin about trying the 2N5457's in it instead