Tweakers' Asylum

RE: Opamp implemented for power supply circuit.

99.236.79.8

Blackdog

M

In Reply to: RE: Opamp implemented for power supply circuit. posted by Duster on April 26, 2018 at 15:58:39

Error correction. The opamp monitors the output and adjusts the voltage. Since it is operating at DC, changing it out will do nothing. It also has a low impedance input so noise isn't an issue either.
You might get an improvement from replacing the main diodes for hexfreds or schottky diodes. Maybe lower ESR caps too. But improvements will be minimal and unlikely to be audible.

Dan Santoni

Follow Ups:

RE: Opamp implemented for power supply circuit. - Duster 19:16:51 04/26/18 (2)
Thank you very much. I appreciate the insight, Dan.

Since I have your ear, this one looks like a dual opamp for signal purpose installed in a headphone amplifier (see red arrow).

TIA for any advice.

Cheers, Duster
- RE: Opamp implemented for power supply circuit. - Blackdog 22:11:37 04/26/18 (1)
  That one would probably make a difference. You could probably use a Burson there, although I prefer the Dexa, but that's personal preference.
  
  Dan Santoni
  - RE: "I prefer the Dexa" - 1973shovel 03:50:42 04/30/18 (0)
    Would you mind expanding on this, beyond it being a "personal preference"?
    
    I'm assuming (yes, yes, I know) from that comment that you've tried both the Dexa and the Bursons, and would like to know why you prefer the Dexa. I'm curious to know if your preference stems from a technical standpoint, or a sonic one?
    
    Thanks.
    
    "Suddenly, I'm not half the man I used to be. 'Cause now I'm an amputee" J. Lennon

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