Will a JFET distort more when the input V is reduced? (Like a triode)

Thread Starter

gbloomers

Joined Apr 1, 2019
11
hi guys,

Quick question about JFETs... if you reduce the input voltage then should they distort more? The idea being that they are emulating a triode, and some people add a voltage control to amps to get distortion at lower volumes and they are both voltage controlled devices.. Am I correct in thinking this?

Currently when I reduce the voltage to my JFET in an MySpice simulation, the resulting waveform isn’t altered, just its amplitude.

Thanks in advance!
 

Thread Starter

gbloomers

Joined Apr 1, 2019
11
Thanks for the replies. Im trying to find a way for the user to control the distortion levels. I have tried cascading 3 JFET stages together, and also adding a potentiometer to the supply voltage, but when you change these parameters it doesn't make much different to the resulting waveform. My circuit is attached, if anyone has any ideas then that would be great!
 

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danadak

Joined Mar 10, 2018
4,057
Distortion can occur multiple ways but over driving a transistor amp
into clipping is one way which produces clipping.

Reducing input level, to a "well" designed transistor amp, will lower
the S/N ratio effectively increasing noise in the output (assuming
one keeps volume constant).


Regards, Dana.
 
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