DI BOX with FET (J201)??

[mathflan]

Hi

I'd like to know if there are schematics for a direct box injection wich use FET transistor like J201.

[R.G.]

Why?

[mathflan]

Because I like the sound of the J201 and that there produce less noise that an opamp like TL071.

[petemoore]

Hookup a Jfet and see whappens...unless you want something else in there. too..?

[octafish]

Checkout the simple sim
http://www.diystompboxes.com/analogalchemy/pedals/simplesim.html
not jfets but I built one for a mate and he loves it.

[StephenGiles]

Try this, I use 2 with absolute silence
http://www.uwm.edu/People/msw/ActivePlug/BootStrap.html
Stephen

[Kleber AG]

Hey Stephen have you used a transformer as per the schem? Is it possible and worth to sub for an active electronic balanced XLR output???
It's hard for me to find those transformers here....

Regards
Kleber AG

[Gilles C]

I used Don TillMan Active Preamp

http://www.till.com/articles/PreampCable/index.html

and I was thinking of using these 3 circuits as inspiration to make it a balanced output circuit.

http://www.uwm.edu/People/msw/ActivePlug/BootStrap.html

http://www.till.com/articles/PreampCable/index.html

http://www.uwm.edu/People/msw/ActivePlug/BootStrap.html

My suggestion: use the first FET as input buffer and use it for one side of the balanced output. Feed the output of that same first FET to an output buffer as the above circuits. Just make sure that the second output is out of phase with the other output. From how Jensen uses it, it should be how of phase.

Gilles