Hi Andrew
just made my own except for the USB hub. I went down the route of doing my own hub but it was a real pain (although some tech/design docs are available on the net from USB hub IC designers), so I just grabbed a cheapie HUB and used a small TI +5V switchmode to power it. Aka it's a powered hub capable of 500mA per channel, via a rev polarity FET so Vbus would not back feed.
Same with +8V DSLR supply. The rest is just +12V distribution and ensuring centre pin size commonality for devices. Haven't we all faced this issue...2.1mm/2.5mm! I don't know how often I've been caught on this so I went on a quest to make all my DC pins sizes common.
I wanted it in a small package to fit between the dovetails. Works a treat can run USB/RS232 converter, DSLR USB, Autoguider USB; focuser USB... etc all at once.
But hey that's what hubs do....now need more ports!
