I feel i ask a lot of questions on this forum, but i am very grateful for all the answers
I am currently building the AOUT (orig version) and i just finished the bipolar PSU, plus the board and tried hooking everything up to the my LPC1769 core
The LED lights up on the AOUT and i am running the AOUT tutorial, but i can’t figure out if everything is working correctly. I have tried measuring the different outputs on the board with my multimeter but i get a constant reading of around -10v on all outputs, thinking this isn’t correct
I am sending loads of different notes and velocity and i can’t seem to get it to change values. I had first plugged it in without the bipolar PSU, but figured out that this was actually necessary for the tl074, so i am a little worried these might have taken damage? I think i will try to swap them out and test again and otherwise go somewhere i can measure with an oscilloscope instead.
Any ideas or experiences? I tried searching but couldn’t find very much about the AOUT
The Gate LEDs don’t light up either, shouldn’t they be doing that in the tutorial application? I think i should try and just run through all connections on the aout board. It might also be the 6007b shunt which isn’t sitting correctly.
The gate LEDs are a good indicator, if the Core->MAX525 communication is working or not, because an unconnected bipolar PSU or shunt won’t affect this.
Apparently the communication is not working, otherwise the gates would be enabled whenever a note event is played.
The gate LEDs are a good indicator, if the Core->MAX525 communication is working or not, because an unconnected bipolar PSU or shunt won’t affect this.
Apparently the communication is not working, otherwise the gates would be enabled whenever a note event is played.
OK, i doublechecked the connections between core and aout and it seems it is correct.
When i turned on the core the first time afterwards, the red led on ch 1 lit up for a few seconds, but when i rebooted the core it didn’t do it again. Something isn’t right with the connections and i am going through my soldering work on the AOUT now… hmmm!
I also checked all the power supply connections now and they also seem to be good - ie. +/- 12v for the tl074 and 2.048 for the max525 (i measured 2.050, should be ok, yeah?)
Ok, so i just got away from this a little while and came back with fresh eyes. The b11 and b12, b21 and b22 etc are supposed to be connected with jumpers on the male pin headers if i just want unipolar out, right? If i want bipolar i can make the little schematic shown on the AOUT page with a trimmer and some resistors…
I am now going to check out if there is any problems on the core, since i get quite irregular results when i turn on the core - for instance the red LED just lit up on channel 1 and yesterday it did on channel two. Doesn’t seem like there is any bad connections on the AOUT board, so i am thinking it is something from the core..
The b11 and b12, b21 and b22 etc are supposed to be connected with jumpers on the male pin headers if i just want unipolar out, right? If i want bipolar i can make the little schematic shown on the AOUT page with a trimmer and some resistors…
yes, but this shouldn’t make a difference for the gate LEDs - please focus to debug this first (yes, maybe there is a problem with J19 of the core module)
yes, but this shouldn’t make a difference for the gate LEDs - please focus to debug this first (yes, maybe there is a problem with J19 of the core module)
Best Regards, Thorsten.
Sure. This is correct right:
J19:Vs -> AOUT Vs
J19:Vd -> AOUT Vd
J19:SO -> AOUT SI
J19:SC -> AOUT SC
J19:RC1 -> AOUT CS
I just can’t find any mentions of the AOUT and the LPC1769. This is taken from the 016_aout tutorial where it is the STM32 which is being discussed. But as far as i understand it should be the same for the LPC?
