Simplistic NJFET RIAA

diyAudio Chief Moderator
Joined 2002
Paid Member
Why you want to take out the cap multiplier. Use the circuit as designed. There is a chip reg at 9V then a filter. The cap multiplier filter eats the reg's noise by much and brings down the voltage also. Its designed to work form that final voltage.
 
Member
Joined 2009
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Build & measurement pics Low MC pre-pre

1st pic right channel
2nd pic 1kHz direct audio generator 30dB attenuation
3rd pic lefht channel
probe x1

4th pic Low MC pre-pre including capacitance multiplier
5th pic R-Core separate PSU

Are the measurements OK?
 

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Last edited:
diyAudio Chief Moderator
Joined 2002
Paid Member
When you feed from gen's Zo Ohm to cart load value, better tap off to scope as you feed the pre so to be sure what actual input remains when comparing output to the other channel. What is the signal source impedance and what is the input pre-pre's load?