Horio Posted March 28, 2012 Report Share Posted March 28, 2012 (edited) I know I asked this a while back, but what are you thinking of doing for the power supply Kevin? You thinking of tailoring something for this specific build, or do we just come up with our own solution (ie, o22)? Edited March 28, 2012 by Horio Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 29, 2012 Author Report Share Posted March 29, 2012 Have not even thought about the power supply yet. In the simplest version the smallest power one tripple works great. If you go with the outboard amplifier modules then you need something that does +/-20, then you can regulate that down to +/-15 with simple 3 terminal regulators, and +12 to drive the relays. Quote Link to comment Share on other sites More sharing options...
Horio Posted March 29, 2012 Report Share Posted March 29, 2012 (edited) Do you have a rough idea what the current draw is for the various voltages? Seems like the 12V line is going to be very small, but the 5V line might see some current with the Arduino. I have no idea what the +/-20V and +/-15V might see though. Edited March 29, 2012 by Horio Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 29, 2012 Author Report Share Posted March 29, 2012 Fully loaded, on the 20v lines about 500ma On the 15v lines about 250 ma 12v line peaks of 30 ma 5v line I gotta look up Quote Link to comment Share on other sites More sharing options...
Horio Posted April 27, 2012 Report Share Posted April 27, 2012 How is the progress coming along? Is the testing going well? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted April 27, 2012 Author Report Share Posted April 27, 2012 (edited) Kerry still messing with the multi amp I'm waiting on hopefully final preamp boards Edited April 27, 2012 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
Kerry Posted April 28, 2012 Report Share Posted April 28, 2012 I was out on vacation and came back to a ton of work. I'll have some time to finish playing with the servos next week and hopefully we'll be good. Quote Link to comment Share on other sites More sharing options...
mickey Posted May 23, 2012 Report Share Posted May 23, 2012 hi kevin, is there a schematic somewhere? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted May 23, 2012 Author Report Share Posted May 23, 2012 (edited) Sure there is a schematic. Its in my head somewhere. There will be an official schematic at some point. There is a bunch of different ways to build it including single ended only, and balanced/single ended The on board buffer which you don't have to use is an lme49710 driving an lme49600 closed loop with a tl071 as the servo, optionally the lt1150. The onboard single ended to balanced is an opa1632 with a tl071 servo. you don't have to use that either. multiamp works for both. Single ended there are x1 buffer opamps. Clear as mud right? There are a couple of people on amb's forum that think i have sold out to ic's... But they should hear the thing. Just about impossible to tell between the chips and the multiamp. Edited May 23, 2012 by kevin gilmore 1 Quote Link to comment Share on other sites More sharing options...
spritzer Posted May 23, 2012 Report Share Posted May 23, 2012 There are a couple of people on amb's forum that think i have sold out to ic's... But they should hear the thing. Just about impossible to tell between the chips and the multiamp. Blasphemy!!!!!!!! Quote Link to comment Share on other sites More sharing options...
ujamerstand Posted May 31, 2012 Report Share Posted May 31, 2012 They've been making good progress on the display front for the raspberry pi: Quote Link to comment Share on other sites More sharing options...
Horio Posted June 6, 2012 Report Share Posted June 6, 2012 Kerry, How is the testing of the multi-amp boards going? Just curious. Quote Link to comment Share on other sites More sharing options...
c12mech Posted June 19, 2012 Report Share Posted June 19, 2012 I just finished reading through this thread and want to build one of these. I will definitely be on the lookout for the boards when they become available. Thank you KG. Quote Link to comment Share on other sites More sharing options...
Horio Posted July 20, 2012 Report Share Posted July 20, 2012 Anything new going down, on the KGITSOJC front? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted July 21, 2012 Author Report Share Posted July 21, 2012 waiting on kerry for any final changes to the multiamp board. preamp board is finished. Quote Link to comment Share on other sites More sharing options...
ujamerstand Posted July 21, 2012 Report Share Posted July 21, 2012 So which processor did you guys decide on using? Quote Link to comment Share on other sites More sharing options...
Kerry Posted July 31, 2012 Report Share Posted July 31, 2012 I've been out-of-pocket a bit on a new consulting gig and traveling as well. Will get to the multiamp next week. Just playing with the servos at this point. I've built it with the THAT bjt's but I'll try the jfets just to make sure. Quote Link to comment Share on other sites More sharing options...
Horio Posted August 17, 2012 Report Share Posted August 17, 2012 Sweet! Looking forward to hearing your findings Kerry. Quote Link to comment Share on other sites More sharing options...
Horio Posted September 11, 2012 Report Share Posted September 11, 2012 Kerry, have you had a chance to play around with the multiamp boards at all or does the new job still have you swamped? Quote Link to comment Share on other sites More sharing options...
c12mech Posted October 30, 2012 Report Share Posted October 30, 2012 Has there been any progress on this? After the T2, I'm hoping this will be my next big project. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted October 30, 2012 Author Report Share Posted October 30, 2012 No time for a while but I do want this done Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted December 16, 2012 Author Report Share Posted December 16, 2012 http://gilmore.chem.northwestern.edu/kgitsoch.pdf An even sweeter way to do unbalanced/balanced to balanced. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted December 16, 2012 Report Share Posted December 16, 2012 Indeed. Nice. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted December 24, 2012 Author Report Share Posted December 24, 2012 here is another one i like, buildable with currently available parts http://gilmore.chem.northwestern.edu/fcnf.pdf input can handle 10 volts peak to peak, its another operational transconductance amp. input can also handle 2 volts of common mode or differential mode offset with 0 volts dc output, something just about no other circuit can do. No feedback, and distortion approaching .01%. Flat to about 500khz. Needs +/-45 volt power supplies, and plenty of heatsinks. Otherwise cheap to build. Add a unity gain output buffer (2 of them) and set the gain with 2 resistors (or a 3 position switch) and a constant impedance attenuator and have something very slick. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted December 26, 2012 Report Share Posted December 26, 2012 No feedback, and distortion approaching .01%. Flat to about 500khz. at what load? Quote Link to comment Share on other sites More sharing options...
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