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Posts by eric‭

1 post
Score Age
75%
+4 −0
Q&A Driving LED with NPN transistor from I/O pin

I'm trying to understand a circuit for driving a LED found on a board I purchased. Below is the circuit driven by an I/O pin (HS2) of a small 3.3V processor. The HS2 pin is driven by the I/O wi...

4 answers  ·  posted 4y ago by eric‭  ·  last activity 1y ago by TonyStewart‭

Question transistor-switch LED-driver