AVR-Chat

--- In AVR-Chat@yahoogroups.com, "OWEN-A" <oldboot@...> wrote:
>...
> 
> Just done a test with a 12Volt SLA battery and a 12Volt relay coil 
to prove
> the point, 20Volt spike across the battery with a 1N4004 diode 
across the
> coil, 600Volt spike across the battery without the diode, looks 
like the
> original designer may have been expecting the battery to absorb the 
spike!!
> Or ???

Uhhh!?!
You mean there really are people designig circuits like this??

dU = -L * dI/dt is not electronics 101, it's even basic physics 101.
Everybody touching electronic parts in order to do professional work 
(IOW: for making money) should at least have some really basic 
knowledge of something like this.

Ok, ok - thanks for welcoming me back in reality.... :-))