AVR-Chat

Exactly correct - the inductor is connected to +12V In.  D3 is for
reverse polarity protection to the driver circuit.  D2 is supposed to
kill any voltage spikes, but would be blocked by D3 as shown.  Therein
lies the problem.

Hopefully this gets through ok, yahoo has been having problems with
their site.


--- In AVR-Chat@yahoogroups.com, "Steve Baldwin" <steve@...> wrote:
> 
> Where's the problem ?
> As you've drawn it, D2 is across the inductor. Just where it should be. 
> You said that the wiring to the inductor is integral to your unit so
the only 
> place you can get the polarity reversed is at the "+12V In" node.
There's no 
> hinderance there unless you have drawn the circuit wrong and the
inductor 
> is connected to  "+12V In".
> 
> Steve.
> 
> 
> ==========================================
> Steve Baldwin                          Electronic Product Design
> TLA Microsystems Ltd             Microcontroller Specialists
> PO Box 15-680, New Lynn                http://www.tla.co.nz
> Auckland, New Zealand                     ph  +64 9 820-2221
> email: steve@...                      fax +64 9 820-1929
> =========================================
>