David,

It took a bit of searching to find the board layout, so to save others the hassle: 
http://www.dpharris.ca/index.pl/block_diagram  :-)

On Sat, 14 May 2005 14:18:46 -0700, David P Harris wrote:

> I would appreciate any feedback, suggestions for redesign, requests etc.

I see you have the voltage regulators and the H-bridge chip round the edges, which is good in that it allows 
for heatsinks, but the high output devices look a bit crammed together - a nice bit of board-packing but it 
doesn't allow for heatsinks to be fitted if anyone wants to do so.  Does the design allow for alternate 
transistors to be omitted to make room for heatsinks on the remainder?

I wonder if the cluster of individual resistors in the bottom-left corner can be replaced by SIL resistor 
packs, giving you more space to play with?

I don't see any ICSP connection anywhere, and the PIC looks difficult to remove from the board as it's closely 
surrounded by other parts.  How do you (re-)program the PIC?

Does the design allow for CAN-bus drivers instead of (say) RS485, so a CAN-compatible PIC (18F258) can be 
used?

What does the "Capacitance Discharge Unit" do?

Cheers,


Howard Winter
St.Albans, England


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