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operational amplifier

  1. AshhBoy_

    dbx cx3-mkI faulty channel repair

    After having my cx3 fixed because of a dead right channel on arrival, I used it daily for about two years with mostly no issues. Two days ago, I fired it up to discover my right channel was presenting a large ac-synced humming noise. I quickly unplugged everything and checked all my wiring, to...
    • AshhBoy_
    • Thread
    • channel failure dbx dbx cx3 operational amplifier output board preamp repair transistor
    • Replies: 4
    • Forum: Solid State
  2. S

    op-amp: njm4560

    Hello guys I tried to measure dc voltages on op-amps in onkyo a-8650 and I found these results: Q105 1. -0.36V; 2. 0V; 3. 0V; 4. -18.1V; 5. 6.4V; 6. 6.4V; 7. 0V; 8. 18V Q106 1. 0V; 2. 6.4V; 3. 6.7V; 4. -18V; 5. 0V; 6. 0V; 7. 1.9V; 8. 18V Does dc voltage on Q105 1 and Q106 7 outputs suggests...
    • spdf
    • Thread
    • operational amplifier
    • Replies: 22
    • Forum: DIY
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