2N7000 challenge

[sbirkenstock]

Hi Everybody,

just started to work on pedals, so I try to do fairly easy stuff.
I got a jfet booster working and I want to hear the differences in sound compared to a 2N7000.
So here is my 2N7000 booster project:
I figured out the bias by testing.
I got 1k at the source to ground and 10k from drain to 9V.
Then I made a voltage divider from 9V to ground (wiper to gate) to see what happens to the drain voltage depending on the bias.
Not much happens if the gate voltage goes over 3.1V (drain will stay at 0,9V)
The drain reaches the full 9v at 1.7V at the gate.
So I biased at 2.4V and in theory the input swing could be + or - 0.7V.
But if I use a Strat which should put out a lot less than that I get a pretty distorted sound. Or let´s say more medium crunchy. But far from clean.

I go in the gate with a .022 cap, bias is connected via 1Meg, at the drain I go out with a .022 cap and then I have a 250K pot to ground, the wiper is the output.
Any hints?

[robthequiet]

From the description, I'm a bit fuzzy on how your 1M resistor fits in. Does in go in series to the voltage divider from the .022 cap or does it go from the cap to ground before the voltage divider pot? Also, I presume you've tried adjusting the divider pot up and down to see what happens with the distortion? You could find a datasheet on the 2N7000 and see how much current it likes to see between source and drain.

[duck_arse]

try increase the 1k, and reduce the 10k.

[sbirkenstock]

I found my mistake :-)
One part I forgot to mention, I did bypass the 1K source resistor with a cap.
And that would make amplification higher.
After removing the bypass cap, everything worked as I aspected :-)
Thanks anyway!