Jfet BOZ

[ramallo]

Originally Posted by carpenter

Do you happen to have the exact schematic you used?

This schematic

[Zen Mod]

Originally Posted by ramallo

I tried the jboz with the 310 with bad results, more distortion and an hf oscillation (Maybe I did some things wrong)

there is sort of 310 BOZ sch posted by Juma

it works flawlesly

search

[carpenter]

Originally Posted by ramallo

This schematic

I played around with your ideas and came up with some valuable modifications:
(there's a very nice power curve and decent gain)

[Joao@AltheaMusica]

Nice, can you simulate this with a JFet-current source in the source.

Thanks
Joao

[carpenter]

Originally Posted by Joao@AltheaMusica

Nice, can you simulate this with a JFet-current source in the source.

Thanks
Joao

Of course!

[ramallo]

Originally Posted by Zen Mod

there is sort of 310 BOZ sch posted by Juma

it works flawlesly

search

Yes, was based on the Juma schematic, but not luck here. I did the J310 preamp and have worse numbers than the K170 (The only good thing is much lower gain) (I made two preamps at the same time for do the mods and comparisons).

[ramallo]

Originally Posted by carpenter

I played around with your ideas and came up with some valuable modifications:
(there's a very nice power curve and decent gain)

Thanks , I'll try it

[tmblack]

This might have been asked before but what is the purpose of the 475 resistor in series with the output capacitor?

[juma]

Originally Posted by ramallo

This schematic

R5 and R6 have wrong values in that sch.
R6 overloads the JFET (you can keep it but make it 100k) and R5 needlessly increases the output impedance (22R is enough to isolate cable capacitance).

[tmblack]

Does it work with 12V power supply?