I need to ask another question, since the chip is has an open collector output, what value of the pull-up resistor should I use if I'm connecting it to a 15V supply?Just to be on the safe side, I would recommend you tie pin 9 to your positive voltage supply.
The diodes are there for those application where the part is used to drive an inductive load such as relays. They prevent the flyback voltage associated with such loads from destroying the transistor.
I think I have it clear now.Erm not really the question I was asking, let me rephrase. I designed this circuit: http://kenji.britney.googlepages.com/delay-schematic01.jpg to be connected to J2 on the previous schematic and was wondering whether the pull-up resistor values I used was correct. Could I reduce them into 1 resistor also? Thanks very much!
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