Simple help - trigger output when low

Thread Starter

Razor Concepts

Joined Oct 7, 2008
214
I need some help. I think it is really simple but I do not really get it. When an output is high (+5v), a normal NPN transistor is driven. That works great. However, when the output is low, (0v), I want another transistor to be driven. How would I go about doing this? Thanks!
 

AdrianN

Joined Apr 27, 2009
97
Just connect the base of the second NPN transistor, through a resistor, to the collector of the first transistor. Each collector is an output, and they are out of phase.
 
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