You need EAGLE by Cadsoft (google it) to look at the board and schematic.  You can get a free version on the web.

This project was created before i knew the importance of linking a schematic and board file.  These files are not linked,
consequently errors do happen!

I changed some biasing resistors for the phase lead comparator, if you have referenced the older versions you might notice this.

Im not sure the parts list is 100% up to date, i had to make some mods to the design after i ordered everything.

C33 controls a "no switch" time after each output transition on the comparator.  Originally i found C33 could be just 220pF,
but recently using CM600DU-24NF modules with a loooong 1uS or so delay in switching, i found i had to boost C33 up to 2.2nF.  
This provided a longer period where the comparator has high immunity to noise, and without this there was severe "glitching"
where the IGBT switch noise caused the comparator to switch several times instead of once per half-cycle.

R11 R12 and C9 with IC4E form a pulse-width limiter that is frequency dependent.  You can disable it by shorting out C9.