signal from coil and back emf......

[Clare Snyder]

Tony Bryant wrote:
> 
> <snip>
> 
> > to 12 volts with a 555c. The coil back-emf from a 2 ohm injector is
> > negligible - I would use the low impedence units with a limitting
> > resistor to start with, then go to a peak and hold driver if necessary.
> >
> 
> The back emf of injectors is only limited by the zener in the driver
> - generally a 39V zener (see the LM1949 docs). This back-EMF is vital
> in allowing the injector to close fast.
> 
> More than enough to pop a cmos gate.
> 
> 
But not nearly as fierce as the back emf of a 12 ohm injector!!!
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