High-impedance injector off a low-impedance driver?

[bcroe at juno.com]

The garden variety OP amps don't have that kind of output 
power, and those that do require an impressive power supply.

You need more serious design work to solve that problem.  
Anyway, the required waveforms for low and high impedance
injectors are different.

Bruce Roe

On Thu, 7 Mar 2002 14:27:02 -0800 "Geddes, Brian J" 
<brian.j.geddes at intel.com> writes:
> Okay, after a little research and lots of good advice from Bruce of 
> the
> Megasquirt site, I've figured out that I can't run the two injector 
> types in
> parallel.  
> 
> An EE friend of mine had the following idea:  what if I got an 
> opamp, set it
> to a gain of 1 (I think that makes it a voltage follower?), and 
> wired the inputs of the opamp in parallel with my 
> low-impedance injector?  I could then use the opamp's 
> output to drive the high impedance injector.   It seems
> like that should effectively recreate the ECU's injector driver 
> signal for my additional high-impedance injector, but 
> have it draw it's current directly from the battery/alternator.  
> 
> I'm no EE though.  Any problems with a system like this?  And where 
> would I buy an opamp?  
> 
> Thanks,
> - Brian

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