Need Help

Discussion in 'General Electronics Chat' started by mclambert, Apr 3, 2013.

  1. mclambert

    Thread Starter New Member

    Apr 3, 2013
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    Trying to identify IC.
     
  2. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    3,705
    It could be a dual op amp but I think there may be something lost in translation from the circuit board to the drawing. The connection to pin #3 is odd no mater what the chip is. That ladder of resistors may connect to ground somehow as a voltage divider.

    The relay coil may connect to the positive voltage rail instead of as shown. Please double check all connections.
     
  3. praondevou

    AAC Fanatic!

    Jul 9, 2011
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    Did you draw this schematic from a PCB? If so, what's the IC package and what is printed on the IC , if anything?

    Pin 2 is floating when the switch is open? Well maybe it has some kind of internal pull-up resistor.

    The 39k, 10k resistors are 27k all together, just a simple pullup. doesn't make to much sense putting several in series.

    Just simplified your circuit, maybe somebody recognizes it.

    [​IMG]
     
  4. absf

    Senior Member

    Dec 29, 2010
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    Does the circuit look right if it is a DIP8 dual op-amp?

    Allen
     
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