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343 Views 1 Reply Latest reply: Apr 4, 2013 8:33 AM by MikeWeed RSS
mclambert Novice
mclambert
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Apr 3, 2013 9:19 PM

I.C.  Help

Im trying to identify this 8 pin ic for weeks now any point in the right direction would be very appriciated .

 

Thanks

Michael Lambert

Image (2).jpg

  • MikeWeed Novice
    MikeWeed
    49 posts since
    Oct 21, 2011
    Currently Being Moderated
    Apr 4, 2013 8:33 AM (in response to mclambert)
    I.C. Help

    It could be a standard dual op amp (LM2904, LMC6482, etc.) being used as a dual comparator. If pin 2 is biased so that it is normally higher than pin 3, then closing the switch will take pins 1,5,6 & 7 high, the collector of the 2N3904 low, thus applying a voltage near ground to the low side of the relay coil. The second op amp is connected as a unity gain amplifier and takes the hi end of the relay coil hi, so the relay and the led turn on.

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