sorenb Posted July 28, 2015 Report Posted July 28, 2015 (edited) Now, Kerry is currently about to test the latest revision of the Kevin Gilmore Digital Attenuator, and since a few people have asked for a Group Buy we hereby probe the interest. Kerry is mostly inclined for the 50k version. Please put your request into the referenced Google spreadsheet. The information in the sheet in rgrds to price is from the former group buy and only to give an idea of where we might end with this group buy. As last time we will investigate cost of fully assembled boards as well as bare boards (with stencil) if people wants to DIY. https://docs.google.com/spreadsheets/d/131vk972PEIm-J4r5IbZT7IP7CAqoMfP4j0RfE0J0xeM/edit?usp=sharing Let me know if the sheet can be improved/enhanced/misses something or whatever The original thread: Please note that one board for two channel balanced operations Edited July 29, 2015 by sorenb
chiguy Posted July 28, 2015 Report Posted July 28, 2015 I don't think you have sharing permissions set on the spreadsheet for others to view. I got a prompt to request access.
s_r Posted July 28, 2015 Report Posted July 28, 2015 Correct me if I'm wrong, but aren't the v2 attenuators capable of balanced stereo on one board? Also just to check, all that's required to use this is the attentuator(s), an uno, a separate +5V supply, and either a pot or rotary encoder?
Kerry Posted July 29, 2015 Report Posted July 29, 2015 It's actually one board for two channel balanced operations. Pretty cool how small it is
Kerry Posted July 29, 2015 Report Posted July 29, 2015 Also, looking at the price, I think we would be in the neighborhood of $180 - $190 for assembled units. That depends on a million things including volume. I just wanted to set the right expectation.
kevin gilmore Posted July 29, 2015 Report Posted July 29, 2015 i'm assuming that is for a balanced pair?
Kerry Posted July 29, 2015 Report Posted July 29, 2015 (edited) Yes, that is for a balanced board fully populated. The biggest swing will be in manufacturing costs and resistors. I assumed similar pricing to last time for resistors for the signal path. Then there are a bunch more high current resistors for the relays (32) that are relatively expensive. Volume will matter here as well. I also took the manufacturing costs and doubled it since there are double the parts of the single channel boards for the last run. This is not really a good assumption, but is a reasonable starting point. There are large setup costs for the manufacturing and we'll need to get decent volume to cover that. Long short this is a real SWAG Edited July 30, 2015 by Kerry
kingofsnake Posted August 21, 2015 Report Posted August 21, 2015 Hope i'm not too late on this one? added interest in 2x bare and 1x10k complete.
kevin gilmore Posted August 21, 2015 Report Posted August 21, 2015 I just updated to what I think is the final board, I added a ground layer on the inside and flipped the relays on the topfor uniform ground plane.
Earspeakers Posted August 21, 2015 Report Posted August 21, 2015 I missed this thread somehow too, anyhow added myself if still open for 2 filled and 2 bare.
sorenb Posted September 16, 2015 Author Report Posted September 16, 2015 About a month ago Kerry was testing some late revision Kevin had done to the boards.I don't know the latest status on this, maybe Kerry can chim in?
Kerry Posted September 18, 2015 Report Posted September 18, 2015 I will finalize my testing on the .4 version this coming week.I think from there, someone just needs to compare the .4 version to the current version to ensure there are no issues.The next steps are to work with the manufacturer to get some test boards made. We will need to provide sample boards to them for the 10k and 50k versions. I don't mind helping out here and building these samples.Then we can make the final run of boards and assemblies.
sorenb Posted October 25, 2015 Author Report Posted October 25, 2015 I will finalize my testing on the .4 version this coming week.I think from there, someone just needs to compare the .4 version to the current version to ensure there are no issues.The next steps are to work with the manufacturer to get some test boards made. We will need to provide sample boards to them for the 10k and 50k versions. I don't mind helping out here and building these samples.Then we can make the final run of boards and assemblies.Any news ?
manywelps Posted November 24, 2015 Report Posted November 24, 2015 Is there somewhere with a GB of the stereo unbalanced boards mentioned earlier? (Or am I misreading this about being balanced?)
Pars Posted November 24, 2015 Report Posted November 24, 2015 (edited) No GB that I know of. Kerry did one about 4 years ago. You might check with him as he may still have a board or two left. If not, the Gerbers are available; you could get some boards from somewhere such as SeeedStudio for pretty cheap. The current design does 2 balanced channels on a single PCB. The previous design required 2 PCBs to do this. Edited November 24, 2015 by Pars
sorenb Posted January 22, 2016 Author Report Posted January 22, 2016 (edited) In rgrds to the Group Buy for a digital attenuator, I've got a quote from PCBNet at 50 boards: 11.40USD.(the interest is 44 at this point in time). According to Kevin this version has been traced by Kerry but apparantly not yet tested. However the previous version has been built by Kerry. Who confirms it is working. Please transfer the amount stated in the spreadsheet to [email protected], putting "Group Buy DA, Head-Case ID" into the notes field. As soon as everybody has made the transfer, the order will be made. /S Edited May 1, 2019 by sorenb
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