MicroSquirt.com read only forum (Jan.15,2018)

Still, I have been reading for a few weeks but wasn't sure which was correct. I knew there must a correct way but not which was the right one.

Genius still stands as you knew the right one and no damage was caused to the MicroSquirt.

You sir are a Genius! Thank You, Thank You, Thank You.

For the first time I see RPM and she pured to life, rich as a pig but started. The wiring is down and dirty (everything else is done properly with solder and heatshrink) but that is easily fixed.

My humble opinion is that this should be ...

Wait what?


Most of the fixes etc that you're reading about are trying to tame the flyback pulse, with its enormous voltage spikes and ringing on. By pointing the diode AT the coil with a pull-up resistor between the diode and the OPTO+ pin , this set-up eliminates the flyback and ringing entirely ...

Hi Mate

Thanks for the reply, that is exactly what I did, 1K resistor to 12V on the OPTIOIN - and diode on OPTIOIN+ to coil but get no RPM.

Troubleshooting was to leave the resistor and diode in and connect a test lamp (and removing the connection to the MicroSquirt) which resulted in the test ...

After reading the first 40 or so pages of those posts (10 posts per page) that come up when i searched I am even more confused,

some say leave OPTIOIN - floating and cut the wire off,
some say earth the wire, YES on the V3 as well as they had no spark untill they did that
the microsquirt manual ...

Gooday folks

I am wanting to use Microsquirt for fuel only to start with, once working I will look into going fuel and spark. I have all of my sensors wired up, including OPTOIN+ (Ampseal pin #30) to the coil's negative terminal through a diode, and connect the OPTOIN- (Ampseal pin #31) to a 12V ...