Injectors and resistors (and i'm back)

[Chaasman at aol.com]

OK, I'm new to driving injectors, but this thread has me thinking:

What is an 808?

I like the MOSFET idea, why dosen't everyone use them?

What about EMI when you shut off the inductive load... use the body diode of
the FET to catch the spike?... if so what voltage?  How about an RC snubber
across the injector... or is EMI not a problem (maybe inductance is low?)

I have worked with pneumatic solenoids and found that the resistance changes
dramatically with temp (factor of 2.5 or so).  Is anything special done in the
injector driver circuits to keep a fixed current to the injector, since the
same thing probably happens with automotive injectors?

Boy, I had more questions than I realized.... Thoughts anyone?

In a message dated 98-11-23 19:36:41 EST, you write:

> 
>  
>  The problem with a relay is it's a mechanical device... There is a delay
>  from the time you tell it to turn on until it turns on, there could be
>  contact "bounce" etc... Best bet is to use another injector driver or make
>  your own from a Power MOSFET.
>  
>  Later,
>  DAve
>