the Perfect preamplifier jfet

[Stee]

this project have a common base VAS
important to avoid base saturation
and perfect feedback timing

 

[DF96]

I guess a perfect preamplifier in a perfect world can manage without any gate bias for its input JFETs!

 

[Stee]

YES

need non-inverted input to GND

 

[jacco vermeulen]

+100mA through the 110R's at 25V rails will be interesting.

 

[lineup]

Input impedance is very low: 1K

 

[Stee]

yes 5mA

if your CD player does not accept load around 1k you can use the non-inverting input

 

[Josip_Del]

Can any other jfet instead of those J74, and K170 not difficult to find, work well in this circuit?

 

[pergo]

mmh, it works?

 

[Stee]

i think

that comes from famous discrete op-amp that i have
but i'm not able to simulate
you do?

 

[Stee]

see this solution

for phase correction and input inpedence

 

[Stee]

version 3.0

now the input impedence it's OK

 

[Stee]

Version 4.0

now you can connect loudspeakers

 

[DF96]

You may have now introduced common-mode distortion in your 'perfect' preamplifier.

 

[ilimzn]

...and that's the least of it's problems...

 

[Stee]

Last version

is this