Zam Posted June 13, 2016 Report Share Posted June 13, 2016 1 hour ago, Altitude said: I've never done it and never had any problems. Adding a diode on the CV will mess up the tuning Hi If you mean in series that's for sure But you can hook one diode at posV and one at 0V, will protect positive over voltage to posV+0.7V and negative over voltage to 0V-0.7V. can be a safe move with bipolar supply component next to the DAC. I have to admit I don't do this with my Ain/Aout pcb design... Ain mpc3208 already have them integrated, don't remember for the tlv5630 But I add at all Ain/Aout an RC filter, it improve jitter, in my use case at least. Best Zam Quote Link to comment Share on other sites More sharing options...
Altitude Posted June 25, 2016 Author Report Share Posted June 25, 2016 (edited) prototype boards are in and despite a DOUT order snafu, everything is working on the Jack board (the DOUTx3). Will try to stuff the AOUT board and have it tested this weekend.. Edited June 26, 2016 by Altitude Quote Link to comment Share on other sites More sharing options...
Altitude Posted July 6, 2016 Author Report Share Posted July 6, 2016 And panel is in, everything fits! 3 Quote Link to comment Share on other sites More sharing options...
Rowan Posted July 6, 2016 Report Share Posted July 6, 2016 Nice work! Quote Link to comment Share on other sites More sharing options...
Psykhaze Posted July 6, 2016 Report Share Posted July 6, 2016 yes , great stuff ! Quote Link to comment Share on other sites More sharing options...
CJ55 Posted July 6, 2016 Report Share Posted July 6, 2016 Yes, great work! I am interested in a PCB set. Quote Link to comment Share on other sites More sharing options...
YannickD Posted July 8, 2016 Report Share Posted July 8, 2016 You are the man! Still interested in a PCB/Panel set. Quote Link to comment Share on other sites More sharing options...
Altitude Posted July 8, 2016 Author Report Share Posted July 8, 2016 (edited) the corrected boards are on their way from OSHpark so next week I'll finalize the testing I was thinking down the road a bit and adding a DOUT/DIN header so you can expand that chain to euro TPD module.. Edited July 8, 2016 by Altitude Quote Link to comment Share on other sites More sharing options...
ilmenator Posted July 8, 2016 Report Share Posted July 8, 2016 Did I just hear TPD? 1 Quote Link to comment Share on other sites More sharing options...
Altitude Posted July 8, 2016 Author Report Share Posted July 8, 2016 Yep. We need to chat.. Quote Link to comment Share on other sites More sharing options...
CJ55 Posted July 8, 2016 Report Share Posted July 8, 2016 8 hours ago, Altitude said: I was thinking down the road a bit and adding a DOUT/DIN header so you can expand that chain to euro TPD module.. Cool! Exactly what I need! Quote Link to comment Share on other sites More sharing options...
Altitude Posted July 12, 2016 Author Report Share Posted July 12, 2016 Ok, preliminary testing done for the Aout portion and seems to work. Need to calibrate and give it a work out. Quote Link to comment Share on other sites More sharing options...
Altitude Posted July 15, 2016 Author Report Share Posted July 15, 2016 and calibration is done. Tracks like a champ, within a millivolt from 1.000 to 8.000 V. Tomorrow, the workout Also worth mentioning: I tested using bus power (+5V from the SEQ) and powering the +5 from the onboard supply and did not see any difference in noise on the scope. Oddly enough, the liner driver receiver gets pretty warm when powering it that way (it still gets +5 from the core regardless of how the other modules are powered). I'll leave the headers on the boards but at this stage, I recommend everyone use the onboard +5V supply Quote Link to comment Share on other sites More sharing options...
Zam Posted July 15, 2016 Report Share Posted July 15, 2016 23 minutes ago, Altitude said: Tracks like a champ, within a millivolt from 1.000 to 8.000 V. How is that possible with 12bit DAC ??? Best Zam Quote Link to comment Share on other sites More sharing options...
Altitude Posted July 15, 2016 Author Report Share Posted July 15, 2016 (edited) 0-10.68V by 4096 steps is 0.003V/ per step so it's reasonable. Maybe 1 millivolt is embellishing it a bit but its pretty close Edited July 15, 2016 by Altitude Quote Link to comment Share on other sites More sharing options...
Zam Posted July 15, 2016 Report Share Posted July 15, 2016 9 hours ago, Altitude said: Maybe 1 millivolt is embellishing it a bit but its pretty close ok Best Zam Quote Link to comment Share on other sites More sharing options...
Lamouette Posted October 25, 2016 Report Share Posted October 25, 2016 Hello, altitude, i am on the way to add leds to my gate outputs. Are you using BC547 as transistor ? i try to understand how it works, i checked shematics of the midi2CV of hexinverter, some yusynths pcbs, and yours , you all use a transistor, but no one use the same way to accomplish this (maybe it is the basics, sorry if it is THE noob question). Quote Link to comment Share on other sites More sharing options...
Altitude Posted October 25, 2016 Author Report Share Posted October 25, 2016 it doesnt really matter what you use, this is how I did it: Quote Link to comment Share on other sites More sharing options...
latigid on Posted October 25, 2016 Report Share Posted October 25, 2016 7 hours ago, Lamouette said: Hello, altitude, i am on the way to add leds to my gate outputs. Are you using BC547 as transistor ? i try to understand how it works, i checked shematics of the midi2CV of hexinverter, some yusynths pcbs, and yours , you all use a transistor, but no one use the same way to accomplish this (maybe it is the basics, sorry if it is THE noob question). Simplest way for you is to use a separate DOUT pin, which I'm sure can be assigned in the hardware config. The reason for using a transistor (or CMOS pin as I have) is to provide extra current for the LED, so it doesn't load down the gate when used in parallel. Quote Link to comment Share on other sites More sharing options...
Lamouette Posted October 26, 2016 Report Share Posted October 26, 2016 I already did the front panel, and don't want to add a specific DOUT only for this. I will use Altitude value and check what happens ! Quote Link to comment Share on other sites More sharing options...
Lamouette Posted October 27, 2016 Report Share Posted October 27, 2016 Don't want to hijack the thread, but i tried the schema, with the good value for my leds, but impossible to get it working. i have 4.8V at the gate output, and used 470R resistor for my led. The datasheet for the BC547 say : Emitter-Base Voltage 6V, is my gate voltage to low to open it ? Quote Link to comment Share on other sites More sharing options...
Altitude Posted October 27, 2016 Author Report Share Posted October 27, 2016 I used a 3904 for my design, maybe that's the difference. The circuit works fine in the module.. Quote Link to comment Share on other sites More sharing options...
latigid on Posted October 27, 2016 Report Share Posted October 27, 2016 Did you wire the transistor properly? The 547 and 3904 have opposite pinouts. You can also bias the transistor to get it triggering at different levels. This blind troubleshooting in an unrelated thread is a bit perplexing. Why not start a new thread and, post pictures/schem of what you're trying to achieve. 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.