[TCML] Transistor Questions (slightly O.T.)

[bartb]

Chris,

As others have already commented on PNP, then maybe a GTO is what your 
looking for.
http://en.wikipedia.org/wiki/Gate_turn-off_thyristor

Regards,
Bart

Christopher Karr wrote:
> I've received the responses, though I'm still at a loss - what I'm asking is this:
>
> Has there been a device manufactured, which behaves like a diode with zero base voltage, but when base voltage (negative or positive, base-to-emitter/collector is irrelevant for sake of questioning) is applied, the device turns 'off' and restricts current-flow. The closest analogy I can think of is a transistor which turns off in the presence of a base-current but, when there is zero base-current, is always on.
>
> Here's an ASCII mock-up of the operation, as it would be seen on an O-scope:
>
> Base Input:
> 10V       ______                  ______                   ______                  _______                 ______
>             |           |                |           |                |           |                |           |                |           |
>             |           |                |           |                |           |                |           |                |           |
>   0V  _  |_  _  _  | _  _  _  _  |_  _  _  | _  _  _  _ |_  _  _  | _  _  _  _  |_  _  _  | _  _  _  _  |_  _  _  |
> _________________________________________________________________________________________________________________
>
>
>
>
> Transistor Output:
>
>
> 10V ___             _________             _________              _________             _________            ______
>
>             |           |                |           |                |           |                |           |                |           |
>
>             |           |                |           |                |           |                |           |                |           |
>
>   0V  _  |_  _  _  | _  _  _  _  |_  _  _  | _  _  _  _ |_  _  _  | _  _  _  _  |_  _  _  | _  _  _  _  |_  _  _  |
>
> Thanks everyone,
>
>  - Christopher
>  		 	   		  
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