'fet as resistor' for cartridge loading? - diyAudio
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Old 4th February 2006, 04:02 PM   #1
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Default 'fet as resistor' for cartridge loading?

Hi,
AoE deals with the possiblity to use a jfet as a resistor. As it is so simple, why not use it as a (programmable) load resistor? Or will the sound quality suffer?
Rüdiger
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Old 4th February 2006, 04:08 PM   #2
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Problems
1) calibration - the relationship between Vgs and Rds is very variable between samples and is temperature dependent
2) relatively noisy - Vgs noise becomes resistance variation
3) its another rf detector to pick up your gsm phone

The linearity is probably good enough at MC output levels
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