Hello,

I should defeat him. In my pine the drawing was flawlessly seen.
Regards,
Imre

On Thu, 2 Oct 2003, Jim Tellier wrote:

> This ASCII art apparently contains TAB characters, and is (like most
> attempts) totally unintelligible without saving it off and manipulating it.
> If (by some chance) it Doesn't contain tabs, then it;s been compromised in
> some other
> way by the cut/paste process.
> Use <SPACE> characters if you want someone to spend the time to look at your
> diagrams.
> It will save everyone a lot of time.
> Jim
> ----- Original Message -----
> From: "Olin Lathrop" <olin_piclist@EMBEDINC.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Thursday, October 02, 2003 12:49 PM
> Subject: Re: [PIC]:High Voltage problems help
>
>
> > >                PIC16F628
> > >                 ______
> > >                |      |
> > >                |      |
> > >      LED       |      |
> > >       |        |      |
> > > gnd___|/|______|b2    |
> > >       |\| _____|b3    |     5V
> > >       |   |    |______|     |
> > >           |                 |
> > >           |              B|/ C
> > >           |_______________|    TIP42C
> > >                           |\ E               ||c________1
> > >                             |_______________c||c
> > >                                             c||c
> > >                                             c||c
> > >                                             c||c
> > >                                              |  c_________2
> > >                                            -- --
> > >                                             - -
> > >                                              -
> >
> > You need a diode from ground to the emitter of the transistor (anode to
> > ground, cathode to emitter).  The transformer primary is an inductor, and
> > will try to make very high voltages if you try to stop the current
> > suddenly.  The negative spike is probably causing considerable current to
> > flow thru the BE junction, then thru the protection diode in the PIC.
> > This can have all kinds of bad an unpredictable effects.
> >
> >
> > *****************************************************************
> > Embed Inc, embedded system specialists in Littleton Massachusetts
> > (978) 742-9014, http://www.embedinc.com
> >
> > --
> > http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
> >
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
>

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