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

[Steve Ward <steve.ward@xxxxxxxxx>]

Uhhh, the PNP transistor?

though i prefer to use a N-channel and P-channel mosfet for such uses.

Steve

On Sun, Jun 6, 2010 at 11:31 AM, Christopher Karr <chriskarr4@xxxxxxxxxxx>wrote:

>
> Hello everyone,
>
> I'm aware of the function of a transistor, though, for my purposes, an
> analogy must be made:
>
> An NPN transistor is like a N.O. SPST  push-button switch (with a diode in
> series, of course). The pushing of the button is analogous to the insert of
> base-current in an NPN transistor.
>
> That being said, is there any sort of transistor which is analogous to a
> N.C. SPST push-button?  Were there such a design, one could simply use a
> square-wave which never goes below '0V' to drive a push-pull setup.
>
> When the signal is high, base-current would be fed to the normal NPN
> transistor(s), turning them on. Also, when the signal is high, base-current
> would be (fed to or pulled from?) the 'normally-closed' transistor, turning
> it off. If the on-times and off-times of these transistors were properly
> matched, one could use nothing but a 555 IC (and maybe a couple signal-level
> transistors) to drive medium- to high-power transistors in a push-pull
> arrangement.
>
> If such a device has not yet been invented, I claim sole rights! ;)
>
> Thanks,
>
>  - Christopher Karr
>
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