JFET as diode in tubescreamer

[brrt]

Hi guys,

I'd like to try JFETs in the clipping circuit of a TS-9dx (OA feedbackloop), but I'm not sure which type to use. I'm not really in to JFET...
Any ideas?

greets, Brrt

[jimmy]

you can use anything you want really. check the FAQ. theres some info in there about using transistors as diodes.

cheers
Jim

[chumpito]

I don't think a jfet will work like a diode exactly.  You can use it for clamping the signal as if it were two diodes connected in a clamping circuit though just run the signal from the drain to source, I forget if the gate has to be grounded or just left disconnected :oops: I think it made a difference.  From what I remember from some book jfets are different from mosfets and trans. etc. in that they conduct equally well from D->S & S->D, so in most circuits you could reverse the S & D without problems.

[WGTP]

I have used the MPF102 that Radio Shack carries and J201's as well.  They seem to work fine and have a slightly smoother sound than SI diodes do.  Try various combos: Jfet/Jfet, Jfet/SI, Led/Jfet, Led/SI, 2 of on and 1 of another, etc.