[TCML] Transistor Questions (slightly O.T.)
steve.ward at gmail.com
Sun Jun 6 13:32:49 MDT 2010
Uhhh, the PNP transistor?
though i prefer to use a N-channel and P-channel mosfet for such uses.
On Sun, Jun 6, 2010 at 11:31 AM, Christopher Karr <chriskarr4 at hotmail.com>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
> If such a device has not yet been invented, I claim sole rights! ;)
> - Christopher Karr
> The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with
> Tesla mailing list
> Tesla at pupman.com
More information about the Tesla