latigid on Posted February 12, 2013 Report Share Posted February 12, 2013 Hi, I haven't routed a board before, so I would appreciate any advice! The top ground plane has been omitted for clarity. Seeing as I am using an AOUT_NG, my design has the same dimensions and mounting holes. I would stack the AOUT on top of this one with M/F standoffs. The eight analogue outs and gates are brought out to a DB-25 connector. The gates are either buffered or amplified to approximately 12V, selectable via jumpers. I am using a 100k/71.5k voltage divider for approximately 2.4x gain. At a 15V supply a 100k/50k combination would provide a gain of 3. One could also mount a variable resistor instead of the jumpers for more control. This works on paper, but I am wondering if the op amp will swing right up to its rails? There is a spare buffer for the DIN sync/start connections also. I haven't figured out libraries in Eagle yet so some of the parts aren't quite right. <<Hmm, they probably need current-limiting resistors too....>> I am not sure how to power things inside my SEQ yet. Building a linear triple output PSU looks to be the best, but I may try a switch- mode unit. In this case power would be supplied at J1 and a daisy chain output is at J15 on the right-hand side. Perhaps it isn't quite the right thing to do, but I have isolated the grounds for the AOUT and gate signals. The ground for the gates can be tied to the same ground as the AOUT signals. Lastly, I have included pins for a DC-DC converter in case the SPSU doesn't work out. The two footprints on the top left of the board are for the muRata NMV0512SC and the Recom RS-0512D. It might be wise to include an inductor-capacitor circuit which can supposedly reduce the ripple voltage down to 5 Vpp. Thanks for looking and please share your thoughts! Quote Link to comment Share on other sites More sharing options...
jojjelito Posted February 12, 2013 Report Share Posted February 12, 2013 Hi, Please remember that you need a rail to rail op amp if you want the output voltage to swing up to the rails. Otherwise you'd be within one diode drop (~0.7V) to 1.0V from that on the plus and minus side. Quote Link to comment Share on other sites More sharing options...
latigid on Posted February 13, 2013 Author Report Share Posted February 13, 2013 Yes, I was thinking this. Perhaps it would be better to use a 15V supply, then it shouldn't have trouble with 12V. Quote Link to comment Share on other sites More sharing options...
latigid on Posted March 29, 2013 Author Report Share Posted March 29, 2013 A few layout modifications and I have ditched the ground isolation. An LC filter was added which might be useful for a SPSU or DC-DC converter. Everything is labelled. I think I will go through http://www.dfrobot.com/index.php?route=product/category&path=135_134 seeing as they do DHL shipping for a cheap price. Final thoughts? Quote Link to comment Share on other sites More sharing options...
latigid on Posted April 11, 2013 Author Report Share Posted April 11, 2013 Looking good, all components are fitting well and it perfectly aligns with the AOUT_NG. I would like to test my one first (not yet as Musikmesse is this weekend) but if anyone would like one I will offer them at USD5 + shipping. Quote Link to comment Share on other sites More sharing options...
monokinetic Posted April 11, 2013 Report Share Posted April 11, 2013 Assuming they test out OK, I will take a PCB. Thanks for offering :smile: Quote Link to comment Share on other sites More sharing options...
latigid on Posted April 20, 2013 Author Report Share Posted April 20, 2013 Everything soldered but yet to test with the SEQ. Quote Link to comment Share on other sites More sharing options...
orange_hand Posted May 3, 2013 Report Share Posted May 3, 2013 Hi, I would be interested in two boards as well :phone: Cheers orange Quote Link to comment Share on other sites More sharing options...
gomiboy99 Posted May 6, 2013 Report Share Posted May 6, 2013 Hi, I think I could use one of these too, if there is one available. Thanks Tim. Quote Link to comment Share on other sites More sharing options...
latigid on Posted May 6, 2013 Author Report Share Posted May 6, 2013 Okay, we can use this as an unofficial waiting list. I would like to test and document the boards first though. Just finding the time as usual... but Thursday is a holiday for me! Quote Link to comment Share on other sites More sharing options...
latigid on Posted May 9, 2013 Author Report Share Posted May 9, 2013 After a few chores I managed to make all of the connections to the SEQ today. Everything fits, although I did have to shave down the SIL headers for the 15 mm clearance below the AOUT_NG. I'm off for a week tomorrow, so you'll have to "watch this space" :) Quote Link to comment Share on other sites More sharing options...
magneticstripper Posted May 16, 2013 Report Share Posted May 16, 2013 3 please Quote Link to comment Share on other sites More sharing options...
Lamouette Posted May 16, 2013 Report Share Posted May 16, 2013 Watching watching.. :D 2 for me ! Quote Link to comment Share on other sites More sharing options...
mirmidi Posted May 21, 2013 Report Share Posted May 21, 2013 Hi. One for me please ! Quote Link to comment Share on other sites More sharing options...
latigid on Posted May 21, 2013 Author Report Share Posted May 21, 2013 I think that we're over the 8 boards that I have available, but there's always the possibility that people back out etc. I am currently waiting on a bit of advice with regard to level-shifting the gates from the STM32 core, I'd rather not fry my pins :) I'm happy to organise another run if there is demand for one. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.