spippoli

thanks to seppoman I found I had swapped all the 1,5 and 15 resistors :-[ after having them in the right places calibration goes soooo much better, one question though: What voltage range should I expect for gates in bipolar mode? I'm getting +/-3V and don't know if it is supposed to behave like this or the range should be wider...

I'm using one of those AC wall wart with multiple voltages settings, set to 12V. The box says it can deliver up yo 1,8A. The plug is connected in parallel to j1 on the core and to this (http://www.musicfromouterspace.com/analogsynth/WALLWARTSUPPLY/WALLWARTSUPPLY.php) board to get bipolar +/-12V for the aout_ng module. Now I got scared from your statement since using this supply configuration with the bipolar ground connected is still turning off the box (lcd and aout_ng led turn off). By disconecting the bipolar ground I find 50Hz 20V peak to peak signals at the gate outputs, when at least it should be the opposite, no? So it could be that I damaged the DAC? Anyway notice that going back to separate wall warts I'm stuck in the out-of-range/steady-out situation

I still didn't get the aout_ng module to work correctly. Yesterday I made some tests with smashtv and here's what I found: first of all all gates behave the same; in unipolar mode when calibrating the outputs I get 0V for minimum and more or less 11V for middle and max values. Setting calibration to 1V no matter how I tweak the trimmers the closest value I get is 2V. When setting the jumpers to bipolar mode the output stays steadily at 11V no matter the calibration setting or the trimmers tweaking. I tried supplying the core and the aout_ng module with two separate wallwarts (DC for the core and AC for the aout) or in parallel from a single AC wall wart to check for ground potential issues but it didn't solve. I checked pin 16 on the DAC, which is the reference voltage and I got 2.03V. The datasheet says that typical value should be 2.043V so it should be ok. While doing this measurments I noticed that c10 was not soldered properly since tin didn't get all the way through the holes and reflowed it. After I did this I noticed something weird: using the same supply for both modules wouldn't turn the box on, while with different wall warts the unit turns on and behaves as before (steady 11V at the output in bipolar mode and out of range tuning in unipolar mode). Any idea on what to check now?

yep, thanks to patient stryd_one I sorted that out now at least I get voltages at the cv outs, but I'm still fighting with the calibration procedure... but I'll give me some more time before asking here :D

A short update after some tests: application in compiled with this option ; define the AOUT interface which is used here: ; 1: one MBHP_AOUT module ; 2: up to 4 (chained) MBHP_AOUT_LC modules ; 3: one MBHP_AOUT_NG module ; all other values invalid! #define AOUT_INTERFACE_TYPE 3 and aout_ng module is connected to core through j6 socket as stated here for MBSID: http://www.ucapps.de/midibox_sid/mbsid_aout_interconnections.pdf though j6:SI and j7:SO looks flat on my scope, while I see some data flowing through j10 pins as I tweak calibrations options. I guess I have to use j10 to connect core to aout_ng module but couldn't find any info on it and I didn't want to fry my DAC. There's a link on the midibox_cv page but it's broken http://www.ucapps.de/midibox_cv/mbcv_aout_ng_interconnections.pdf

yup, that was it! Now gates are working nicely, anyway gate's output are still always 0V. It seems that there's no signal on the serial line to the aout_ng module.

@stryd: yes it's a 4620. @TK: thanks for the reply, I just tried uploading both mios and the recompiled midibox_cv with the modified cv_map.inc, but I get the same result.

Hi, I'm building a midi-cv using seppoman aout_ng module. Here's where I'm up to: -core has 18f4620 pic -I'm using a datawheel so I changed PROCESSOR = 18f4620 in the Makefile.orig file and #define DEFAULT_ENC_DATAWHEEL 0 ... #define ENABLE_J5 1 ... #define AOUT_INTERFACE_TYPE 3 inside setup_default.asm file. Recompiled with gpasm and uploaded the firmware. The application seems to work fine since LCD and DIN button/wheel behave as expected (menu navigation/settings work ok). Sync tests are ok, j6 clock and enable pins works correctly. To test gates I disconnected the aout_ng module and played some midi notes. Here I get animations on the lcd but on the gate out (j5:a0) I only get short pulses (~uS). Also with aout module connected playing midi notes I get no voltage across cv out. Where could the problem be?