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G

GCook

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    • G
      GCook replied to the thread Lightbox circuit.
      On the main board schematic there is a J2 input connector with two terminals (SIGL and GND). Connect there.
    • G
      GCook replied to the thread Lightbox circuit.
      The main board. Not the input board.
    • G
      GCook replied to the thread Lightbox circuit.
      Connect one end of a alligator clip jumper to SIG. Connect the other end of the jumper to a 1/4 watt, 50K resistor. Connect the other...
    • G
      GCook replied to the thread Lightbox circuit.
      If you have a 1/4 watt, 50K resistor, just jump the SIG input to GND. The successful result will be that the resistor remains cold to...
    • G
      GCook replied to the thread Lightbox circuit.
      Nigel- I'll be quiet, and just sit back and watch. Splitdog- Your meter says it's not, so I guess it isn't.
    • G
      GCook replied to the thread Lightbox circuit.
      Okay, I see it on the other schematic. I guess you figured out I was just focusing on the input board. I'd like to know why the circuit...
    • G
      GCook replied to the thread Lightbox circuit.
      Does one of the outer pins of the pot connect to GND? You'll have to look at the trace side of the input board.
    • G
      GCook replied to the thread Lightbox circuit.
      The 33K resistors are probably to keep the input from being over-driven (distorted). I don't see the DC voltages that Nigel is talking...
    • G
      GCook replied to the thread Lightbox circuit.
      You're getting noise, because it's acting like a radio receiver antenna. Without the input pulled down, it is extremely sensitive. It...
    • G
      GCook replied to the thread Lightbox circuit.
      The more I look at it, that's not going to be the answer. Without an additional resistor between the pot and GND, the line-level or...
    • G
      GCook replied to the thread Lightbox circuit.
      The drawing doesn't show the pot connected to GND. The pot may need to be across SIG and GND, allowing the signal to take alternate...
      • input noise.jpg
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