Im still learning myself but this is the best explanation ive found: http://www.electronicstheory.com/COURSES/ELECTRONICS/e101-47.htmOk, I think I got it.
Using multisim I used a single output from the 4043 to trigger 2 2n2222 transistors in order to switch some LED's. I put a 1K resistor on the base of each 2n2222 transistor and the simulation is working correctly...Using a 12V source.
However, I still want to know, how do you determine the base resistor of a 2n2222 if the supply voltage is 12V and the transistor is switching a LED with a 470 ohm series resistor?
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