Tweakers' Asylum

Posted by 1973shovel (A) on June 09, 2008 at 22:35:22

In Reply to: RE: Hmm.... posted by Tweekeng on June 09, 2008 at 22:05:18

After reading your post I went back and took some measurements. When grounding my meter at the grounding post of the phono stage (where the turntable ground lead would normally go) I measure +/- 4.7 vdc at pins 4 & 8.

If I ground the meter at the ground in the outboard power supply I get 9.35 volts at pin 8, and 1.3 mV at the negative pin 4. So it sounds like your assessment of "the classic input offset method" may be correct.

So, if the answer is to simply build a negative power supply, part of my original question still stands. Can I then lift the power pins of the 2604, bend them outwards, and attach the +/- to the appropriate pins via wire?

Thanks for your input, Tweekeng. It is much appreciated.

• Yes, but... - Tweekeng 23:40:21 06/09/08 (3)
  • RE: "you can run just about any (non-inverting) opamp single ended mode" - 1973shovel 09:23:20 06/10/08 (2)
    • Shouldn't hurt but may not help either... - Tweekeng 19:41:49 06/10/08 (1)
      • RE: Shouldn't hurt but may not help either... - 1973shovel 20:19:58 06/10/08 (0)

Post a Followup:

---

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Tweakers' Asylum ]
[ Comment ] [ Edit ] [ Delete ] [ Copyright Warning! Click for Details ]

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2008, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---