Need Help

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

  1. mclambert

    Thread Starter New Member

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

    AAC Fanatic!

    Nov 23, 2012
    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
    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.

  4. absf

    Senior Member

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