Documentation and design files updated
2007-09-30 by djbrow54
Two of the beta builders have made good progress with ordering parts and building boards. Neither seemed to have too much trouble soldering the SMT DACs. Since we've only found one error in the parts list, and drmabuce has posted a lengthy progress report about a nearly fully functional CVS, I updated and consolidated the design documentation. The latest documentation is included in a single ComputerVoltageSource pdf file in the "Files > Hardware > CVS Module" folder. This document contains specifications, schematics, parts list, PCB images, a snapshot of the latest FAQ database, and a recommended build and test sequence. I would encourage everyone who is building a CVS to include their tips, suggestions, and learnings in the CVS FAQ database. I also uploaded the PCB design file and a readme in zip format to the same folder. The readme contains information on how to order a PCB. They are economical in quantities of 8 or more. The DAC still seems to be in allocation. I used the Analog Devices AD5726YRWZ which is showing a November availability on their page. The board can also use the Texas Instruments DAC7714UB or a DAC7715UB. The TI page shows only limited availability of these parts in Europe. The TI page previously indicated an August availability (they have been in allocation since last December!). The board should be able to use a DAC8420 and Digikey has 12 SMT parts listed at the ridiculous price of $45 each. I never pursued this part since the price was so high so someone would need to check out compatibility. I would suggest whoever is interested to contact Analog Devices and TI and find out what the latest DAC availability status is. This is certainly a precursor to organizing an order of boards. Again, just to clarify, I do not intend to sell this board so don't ask me. The design file is public so those that want the board will need to organize their own group purchase. Dave