discrete jfet input opamp

rubydac

Member
2007-11-14 5:53 am
From 2sk389 jfet input used output from drain pins of them instead output of ne5534 by cascode to pin1/8 and short input pin 2/3 of ne5534 to ground !!!

So now you have jfet input opamp instantly !!!

I took it from studio amplifier (**,*** USD)
 

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Re: Give me some link

rubydac said:
Please Mr.perander send me some link which used this schematic.
I find all of same as this method but I never seen about this ?!?

Thanks


http://www.national.com/an/AN/AN-222.pdf

There is also an app note in an old Siliconix application book but it's hardly to befound on the net. I have this app note somewhere. The idea is the same as the link above but JFET's were used and the opamp was NE5534.

http://www.analog.com/library/analogDialogue/archives/39-05/op_amp_applications_handbook.html
http://focus.ti.com/lit/an/slod006b/slod006b.pdf