the Perfect preamplifier jfet

Stee · 11th June 2011, 02:16 PM

this project have a common base VAS
important to avoid base saturation

and perfect feedback timing

DF96 · 11th June 2011, 02:54 PM

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

Stee · 11th June 2011, 03:47 PM

need non-inverted input to GND

jacco vermeulen · 11th June 2011, 04:56 PM

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

lineup · 11th June 2011, 04:59 PM

Input impedance is very low: 1K

Stee · 11th June 2011, 05:05 PM

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

Josip_Del · 11th June 2011, 05:32 PM

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

pergo · 11th June 2011, 05:32 PM

mmh, it works?

Stee · 11th June 2011, 05:50 PM

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

Stee · 11th June 2011, 07:24 PM

for phase correction

and input inpedence

11th June 2011, 04:56 PM	#4
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	+100mA through the 110R's at 25V rails will be interesting. __________________ Looks like Sponge Bob has killed another thread.

11th June 2011, 04:59 PM	#5
lineup diyAudio Member Join Date: Dec 2005 Location: the north	Input impedance is very low: 1K __________________ lineup

11th June 2011, 05:05 PM	#6
Stee diyAudio Member Join Date: Jul 2005 Location: milan	yes 5mA if your CD player does not accept load around 1k you can use the non-inverting input __________________ visit my best audio idea http://www.esafono.it/DACTONE.htm

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11th June 2011, 02:54 PM	#2
DF96 diyAudio Member Join Date: May 2007	I guess a perfect preamplifier in a perfect world can manage without any gate bias for its input JFETs!

11th June 2011, 05:32 PM	#7
Josip_Del diyAudio Member Join Date: Aug 2009	Can any other jfet instead of those J74, and K170 not difficult to find, work well in this circuit?

11th June 2011, 05:32 PM	#8
pergo diyAudio Member Join Date: Dec 2008	mmh, it works?

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