Circlotron Driver board from the Group Buy is working.
As I'd like to test as much as possible before connecting everything, I'd decided to hook the driver up as an amp.
The Carbon V5 and Circlotron driver board are very similar although there are a number of differences that require a bit of tweaking to make it work.
The biggest difference is in the servo part of the driver board and since the driver board is missing the A06 - controlling the current in the tail of the output stage directly from the opto - it is probably not possible to run the output stage at 20mA as it will exceed the opto current capabilities.
The pic shows (I believe) everything needed to 'convert' the driver into an amp - I haven't tried to get the servo to work though.
The important alterations is: (not including servo - amp only)
NOT populating the 10k/10uF besides the opto terminal (until it is actually gonna be used that is)
parallel the 500ohm in the tail of the output stage with 150ohm or thereabouts (I just solder one on top - easy to remove again)
adding 2x (100k + 100k) for feedback.
adding 2x 5k1 ballast resistors to the output
This is as I hook'ed it up, and dialed it in for 20mA operation - has ran for some days 24x7 without any problems.
For the servo to work a few changes in addition to the picture above is needed:
the opto has leg2 tied to GND - this trace needs to be cut.
Remove: the 47uF between the opto leg1 and leg2, and 5k resistor between OpAmp leg6 and opto log1
Add: 1uF between OpAmp leg6 and leg2, 200ohm between OpAmp leg6 and opto leg 2, and GND to opto leg1