Searching \ for '[PIC]: EE challenge PIC && 12V' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/power/batterys.htm?key=12v
Search entire site for: 'EE challenge PIC && 12V'.

Exact match. Not showing close matches.
PICList Thread
'[PIC]: EE challenge PIC && 12V'
2001\01\12@075306 by Germain Morbe

flavicon
face
Hello Roman,

i agree to all of your suggestions except that you assume it might be
possible to keep the power with only 1 transistor. At experiments i made
years ago about that, i found no solution for the following behavior.
Imagine you use an NPN in the negative line. As soon as the pic completed
its task it cuts itself from the groundline by outputting a low potential to
the NPNs base. This stops the current flow and as a result to that the whole
circuit floats against the positve potential. Also the portpin to the NPNs
base. It is no longer able to output a zero but rises up to 12V which in
fact turns the NPN on again resp. will not turn it off at all.

Germain

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\01\12@081142 by Roman Black

flavicon
face
Germain Morbe wrote:
>
> Hello Roman,
>
> i agree to all of your suggestions except that you assume it might be
> possible to keep the power with only 1 transistor. At experiments i made
> years ago about that, i found no solution for the following behavior.
> Imagine you use an NPN in the negative line. As soon as the pic completed
> its task it cuts itself from the groundline by outputting a low potential to
> the NPNs base. This stops the current flow and as a result to that the whole
> circuit floats against the positve potential. Also the portpin to the NPNs
> base. It is no longer able to output a zero but rises up to 12V which in
> fact turns the NPN on again resp. will not turn it off at all.

Ha ha! I didn't say it was easy, just that it
should be possible. That's why it's a challenge.
I can think of a few ways to start with, that
*might* lead to a solution, but I'm curious to
see what the experts come up with. :o)
-Roman

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


More... (looser matching)
- Last day of these posts
- In 2001 , 2002 only
- Today
- New search...