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
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