Questions about the triple8 motor-controller used on the original Lawnbot400 can be posted here. There were a few (slightly) different versions of this board, but they all operate the same. It is good for use with low PWM frequencies (500kHz - 1kHz) and under 24volts DC. When using a heavy enough copper clad board (4 oz), this motor-controller could handle up to 50 amps at 24volts and with heatsinks and a cooling fan, could run for hours at a time without sacrificing performance.
I came here from instructables where I found your lawnmowerbot. Great instructable! Especially the 3x8 HBridge! I am going to use that one for my arduino powered dalek.
I ordered the parts list first from this instructable. Then I checked out your github for the files. (STUPID me! First check all the files and then order your stuff). It turned out that the parts list here and the .sch and .brd files don't fit together. The V3 version only has 1 elco in the middle, instead of the 4 on the rest of the pictures. Do you perhaps have the originals also somehwere that match the partlist here :-).