Chainsaw Repair

Here showing a segment from IPL below.

She has two coils,

one for
a) pulser coil and exciter coil

the other for
b) primary coil and secondary coil.

Here it is the circuit for it.

This circuit sits under the flywheel cover.

Hello Sharkey, thank you for visiting and leaving a nice and interesting tip, but I did not know things about limiters on today's saws. My saws are mostly very old except for Husky 550XP.
Do you have a schematic of these limiters?

Ok very nice and good work.

I have a few questions.   First the pink on the schematic is that for the Oscilloscope probes.
Second does the 1 microfarad capacitor have a faster discharge time over the 2.2  microfarad cap and hence affecting the timing.

You might want to coat all your components in epoxy to protect them from moisture and oil.   

Could you go to a larger working voltage on the capacitor to prevent it from getting to hot when making long cuts.

Also did you wind the pulser coil your self.   

How high in the RPM's will this circuit be good for.    Like say up to 14,000 or more.   

Some great info and is good to know you can always come up with an ignition for an old saw.   

I also noticed that in your first schematic at the end of your video you use a SCR to discharge the capacitor into the ignition coil.
On your second schematic you use two transistors to discharge the capacitor into the ignition coil.

Just two different ways to do the same thing or is there a reason that one is preferred over the other due to reliability or something else.

Also the first one looks to be much more simple in design than the second one.