Source/sink

wayneh

Joined Sep 9, 2010
17,495
The term refers to current. The port can supply (source) current from its positive pole or it can accept (sink) current to its negative pole. 4mA is enough to light an LED and not much else.
 

#12

Joined Nov 30, 2010
18,224
Let me put that in perspective. 4 ma can drive a transistor to get a lot more current, if that's what you need.

If your aux port is going to be the input for another IC, it will probably work, but if it's going to be the output to the human world, it's pretty weak.
 
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