|Bottom view. Field Driver FETs (right hand side) will mount face down onto|
the heatsink, with relief holes in the PCB to gain access to the mounting screws.
Need to use a bit more PCB cleaner to get rid of the remaining residue.
Today I did some mocking up of the assembly, just to see what parts fit and what I was missing. Mostly it looks good, but I will need to get taller standoffs to raise the ‘cover’ up some more (Cover not shown here).
A few issues I have found: There was one design error in the FET driver, the 15v clipping zener needed to go between G and S, not G and GND. I relocated the Zener to the back of the PCB and tacked it on. I also am finding the NTC daughter boards a real PITA to solder up. Partly due to their small size, partly due to I made the wire through holes a little small, and partly due to the Chinese sourced CAT-5 cables I purchased, which seem to be made from Aluminum – not copper… Digging through our parts stash I found some unused Magnum remote cables and use them.
|REALLY small PCB there, that is a CAT-5 cable coming in from the left...|
And here is a photo of the 'Service Cable'. This is used in conjunction with the Arduino programming environment to upload the Firmware to the regulator. It can also be used to send/receive ASCII commands to existing firmware to program some of the configurable features, for those who do not wish to mess with 'C' programming, nor the Bluetooth interface:
|Optional Service Cable.|