[Diy_efi] Re: new EFI controller

[Marcell Gal]

Hi Alexei, 

>> The other end of the injector is connected to 12 V,
>> _NOT_ GND.
> 
> Of course, because we always use pull-down actuators as N dopped
> Silicium has less resistance than the P one.

yep. 

> But did you scope the power line on a running car ? You can SEE all
> ignition AND injection events on the line. In the wav file of MAF
> output I've sent you there are voltage spikes on the MAF output signal.
> MAF is a complexe circuit with op-amps and Temp/voltage
> auto-compensations.
> Don't say it's ignition high voltage:  I have a static 4 coils ignition,
> the MAF is FAR from the ignition amplifier and wires (which are under a
> alu cache).

I can't comment on that. You're probably right. Depends on lotsa thingy. 

Anyway, if I build my own boards it would contain a current
measuring resistor so powerline (not just ground) to the power
components must be sufficient anyway.
(Measuring is good for diagnostics as well, not just PWM limiting). 

However Michael's AVR-megasquirt board looks so great to me overall that
I might not bother to design my HW at all, and go with this great thing
even if there are small spots I'd design slightly differently. 

Marcell 

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