Tweakers' Asylum

RE: Inverted input?

129.128.212.105

Bob in Alberta

A

In Reply to: RE: Inverted input? posted by slownlo on August 18, 2011 at 09:00:08

Your source very probably have a common ground point on the output jacks. I can't tell if that is also the case on your amp. Make sure that the ground connection on each of your amp input jacks goes to the ground in the circuit and you should get both channels working. What I think is happening is that when you fully plug in both of your RCA plugs you are grounding out the input to your one channel.

Follow Ups:

RE: Inverted input? - slownlo 16:39:02 08/18/11 (4)
I'm sure you're on the right track...
Here is what things look like...
the drawing is just for informational purposes...
all inputs are correct. I've triple checked them....
Its gotta be something with the grounding...
- RE: Inverted input? - Tony Lauck 11:33:43 08/19/11 (0)
  It's a poor practice to use different colors schemes on the unbalanced left and right input circuitry. But this isn't going to make any difference in sound, just cause confusion.
  
  One other curious asymmetry in the diagram is the power wiring to the circuit boards. Are you sure the polarity of the power wiring is correct? Of course this could just be an artifact of the diagram.
  
  Tony Lauck
  
  "Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
- RE: Inverted input? - djk 18:13:01 08/18/11 (2)
  Your diagram shows a short on the left channel input.
  - RE: Inverted input? - slownlo 19:44:11 08/18/11 (1)
    thanks...I corrected that. The actual amp wiring refects the correction.
    - I think you had it right the first time- - cdb 11:11:25 08/19/11 (0)
      on a 24" monitor zoomed to the max, photo #2, Left has Red to Hot on RCA jack.
      
      Lacking a closeup of both jacks and both PCBs, I can only judge what I see in the posted photos, and the sample board linked below.
      
      Not sure the reason for not wiring both inputs the same way, color-wise.
      ZEN 4 PCB (Open in New Window)

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