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  1. 29-08-2013 #2
    irving2008's Avatar
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    Your diagram is wrong... the connection to the bob is from the other side of the load resistor, not gnd.

    But I think you are using these incorrectly. If these are NPN the load resistor is from output to + supply, not output to gnd. And the load resistor needs to be smaller than 100k, exact value depending on whther bob inputs are opto-isolated or not.
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