3 Attachment(s)
CryoBUG Controller PCB Layout Completed
I've finalized (locked in) the circuit design at Rev 1.2, and have layed out a Printed Circuit Board based on this design.
Changes:
Added fault indication ID. Essentially this consists of another memory latch circuit with LED indication to let the operator know what type of fault has occurred (High Liquid Temperature or Under/Over Pressure).
Implementation required adding one more CD4013 CMOS Dual R/S Flip-Flop, and some miscellaneous discrete support components.
Rev 1.2 Schematic (page 1 of 2)...
Attachment 126438
Rev 1.2 Schematic (page 2 of 2)...
Attachment 126439
Rev 1.2 PCB Layout...
Attachment 126457
Board size = 3.8"x2.5"
2 Attachment(s)
CryoBUG Controller PCB Boards arrived
Well I ended up having to make the board a bit bigger due to the reality of fitting a slightly larger transformer. So this knocked me out of the running to get the mini-board deal through ExpressPCB. And the pricing for having a larger board made was simply ridiculous. So I ended up going through Futurlec and got a very good deal on 10 boards with shipping at $134.50. Total time from ordering to arrival on my doorstep was just under 4 weeks (shipped from Hong Kong).
The quality is quite good, with even the fine detail on the silk screen being reproduced without a problem.
Attachment 127556
And the final assembly went off without a hitch.
Attachment 127557
And best part of all, it works :clap:
What's Next?
I'm going to be running some oil separator tests, with the goal of selecting a properly sized oil return cap tube that can be left continuously connected (no hand valve). To this end I have purchased a sight glass and some very small ID stainless steel capillary tubing.