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controlling NPN transistors

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strokedmaro

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Can an npn transistor be controlled with a ground rather than a voltage input? Like voltage at the base and a ground applied to the emitter allowing (that same ground) to be applied to another part of the circuit?
 
Not that i know of. That would be the job of a PNP transistor. If your circuit is digital, and you need to turn the transistor on with 0v, then just use an inverter connected to the base. (with a resistor, of course).

Someone correct me if i am wrong.

Also, there is absolutely no reason to double post.
 
strokedmaro said:
Can an npn transistor be controlled with a ground rather than a voltage input? Like voltage at the base and a ground applied to the emitter allowing (that same ground) to be applied to another part of the circuit?
Yes, it's called the common base configuration.
Below is an example.
 

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