Threshold fet ten/e high level

this enough?
 

Attachments

  • FET-10hl_schematicW.jpg
    FET-10hl_schematicW.jpg
    46.1 KB · Views: 217
Holy cow. The regulator circuit in the PDF ZenMod posted is the same topology as the Naim NAP250 regulator by Julian Vereker:

attachment.php



It has horrible PSRR at higher frequencies, mainly because the VAS are referenced to the +/- rails and there's no CCS on the LTP. I was going to "fix" it by inverting the VAS (referencing ground), which also requires inverting the LTP, and then add a really simple CCS:

attachment.php



Attenuation of JV's regulator (green) and my inverted one (blue):

attachment.php



However, now I'm wondering. If it's good enough for Threshold, what am I missing?

Cheers,
Jeff.
 

Attachments

  • YoungREG_atten.jpeg
    YoungREG_atten.jpeg
    51.4 KB · Views: 370
  • YoungREGMOD_schematic.jpeg
    YoungREGMOD_schematic.jpeg
    194.1 KB · Views: 321
  • YoungREG_schematic.jpeg
    YoungREG_schematic.jpeg
    178 KB · Views: 345