I want to purchase some transistor array ICs, mainly to save space on these rather expensive pre-sensitized boards I'm getting.
I am stuck on one thing: the COM pin.
Base is input from 4017s, Emitter goes to Ground, and Collector pins go to cathode of LED through a resistor. What is COM? I'm assuming its something I can leave "open."
The chip I'm referring to is TI ULN2004AN (https://www.jameco.com/Jameco/Products/ProdDS/700630.pdf)
Thanks guys!
-M
I am stuck on one thing: the COM pin.
Base is input from 4017s, Emitter goes to Ground, and Collector pins go to cathode of LED through a resistor. What is COM? I'm assuming its something I can leave "open."
The chip I'm referring to is TI ULN2004AN (https://www.jameco.com/Jameco/Products/ProdDS/700630.pdf)
Thanks guys!
-M
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