Aout_NG Not working on midibox seqv4

MIDIbox SEQ
,
1

Hi Guys,

I am finaly near the end of my build of a seq4. Only need to have the Aout_ng and possible the D-out working. 
The D-out I will try to build on a breadboard for some extra gates and clocks.
Realy looking forward for the awesomeness of controlling a modular with the midibox.

Thanks again TK for bringing the AWESOME project to the public.

Would you have any idea what can be the issue here with my aout_ng? Does anything below indicate wrong wiring?

MBSEQ_GC.V4: “CV_AOUT_Type” and set it to 3 for AOUT_NG
And on the CV Configuration Page the aout_ng is set.

Core STM32F4 AOUT_NG on j19 Connected like

J1:1 -> J19:Vs

J1:2 -> J19:Vd

J1:3 -> J19:RC1

J1:4 -> J19:SO

J1:5 -> J19:SC

At least I hope.

No led is enabled on the Aout after booting the midibox and the DAC is not getting warm.

I have only J1-j19 connected so no 12-/+ V on J3

On pin 20 on the TL5630 I got 4.5V on pin 11 as well

-Aout not set in the config
4.5v on pin5, 20, 23 and 11 of the dac
-Aout set in the config

4.5v on pin2, 5, 20, 23, 11 of the dac

[6016.659] Setting AOUT:CS pin to ca. 5V - please measure now!

4.5v on pin2, 3, 4, 5 of the dac

[6016.659] Setting AOUT:CI pin to ca. 5V - please measure now!

4.5v on pin2, 3, 4, 5 of the dac

[6476.996] Setting AOUT:SC pin to ca. 5V - please measure now!

4.5v on pin2,3,4,5 of the dac

 

Does anybody has a hint what I should check?

Thanks in advance,

 

Cheers

 

Tim

2

Testing not on the DAC but on j1.

I also learned that you have to set the pin low manually after a test otherwise it stays hight.

- testaoutpin cs 1
sets J1(4) SI high
-testaoutpin sc 1

sets J1(3) CS
-testaoutpin si 1 sets (J15) SC high

3

Hmmm hope I did not burn anything.
I rewired J1 and ran the test from MIOS studio,

Now I have

CS test J1 pin 3 high

SI test J1 pin 4 high

SC test J1 pin 5 high

But no led flashes

 

4

Run testaoutpin cs - si - sc with 1 and 0 and look for the switch in voltage at the pins, if you get that then all your wiring & config is good. Which LED are you expecting to flash? there is only a power LED on the AOUT_NG PCB. 

5

Hi Slo,

 

Thanks for the help.

From the AOUT documentation: http://www.midibox.org/dokuwiki/aout_ng

“You can leave out the TL074s for a first test. Then connect J1 to the core. Power up your Midibox. If the LED doesn’t light up, IMMEDIATELY switch off power and re-check all connections and soldering.”

“If the LED is on, you can now connect analog power (+/- 12V) to J3.”

So I expected the led to power up, but it doesn’t

I ran the tests and get:

Pin 1 VS, 2, VD

CS test J1 pin 3 high

SI test J1 pin 4 high

SC test J1 pin 5 high

So the wiring seems good.

 

Cheers

 

Tim

6

If LED1 does not power up then you are not getting power and/or GND to the board, or the LED is no good. Recheck connections and be sure the wiring is correct , the J19 to Aout_NG is non standard and not 1 to 1 pin placement.

7

Ohhh no I removed the DAC yesterday but looking back to my notes I actually had 5v on pin 5 on the dac (/PRE ).

I just learned that the flatside of the led symbol means Cathode, which is the -

So there is a high change that I have the LED connected wrongly. I mean 5v on the /PRE input should light up the LED right?

Would wrongly placing the led mean a non working aout?

If the led is wrong I will re solder the old DAC first otherwise I will bet on  a new one.

 

 

 

5a8c2317c4d6fScreenshotfrom2018-02-2013-45-13.png.08e3e98ebbff7be4bda7991bb31cec9b.png
5a8c2317c4d6fScreenshotfrom2018-02-2013-45-13.png.08e3e98ebbff7be4bda7991bb31cec9b.png126×124 5.75 KB

5a8c23fd25df8Screenshotfrom2018-02-2013-49-59.png.384a2b30f4f0d2896591159a409ee192.png
5a8c23fd25df8Screenshotfrom2018-02-2013-49-59.png.384a2b30f4f0d2896591159a409ee192.png466×266 16.3 KB

8

Quote

I mean 5v on the /PRE input should light up the LED right? 

No, not if you installed the LED backwards. The LED only indicates power is available at the PCB, the Aout_NG would work without it. Remove the LED, test it with a 9v battery and resistor, if it lights install it the right way and if you didn’t damage the DAC on removal, re-install it.

1 Like
9

Ok thanks, the LED was wrongly soldered. The led is now working when connected the board without DAC. The DAC did not survive :frowning:

I will get a new one.

 

And will report back here.

 

thanks for your help

 

Cheers

 

Tim

 

10

I’d very interested to hear your report and I really hope it works for you. I could not get my Aout_NG working and gave up after many tries, 1 or 2 other people have experienced the same thing after doing everything right, so your input will be welcome.

11

Thanks a lot for your help!

I bought my DAC from ebay and to be honest I am now buying it from mouser so I have more trust in it.
I will report back here in a while.

 

Cheers

 

Tim

 

12

Ok I got a new DAC.

the led is lightup.

J1 Pin 1, GND

J1 Pin 2, + 4.5V

[24708.300] Setting AOUT:CS pin to ca. 5V - please measure now!
J1 pin3   4.5v
[24683.868] Setting AOUT:CS pin to ca. 0V - please measure now!
J1 pin 3 0v
[24742.891] Setting AOUT:SI pin to ca. 5V - please measure now!
J1 pin 4   4.5v
[24755.116] Setting AOUT:SI pin to ca. 0V - please measure now!
J1 pin 4   0v
[24775.452] Setting AOUT:SC pin to ca. 5V - please measure now!
J1 pin 5   4.5v
[24790.716] Setting AOUT:SC pin to ca. 0V - please measure now!
J1 pin 5   0v

The cables seem good.

A new dac is soldered which I carefully inspected.

Now ±12v is connected to j3. 
On the TL074s ±12v is measured that is pin 4 +12v.

In bipolar mode I get about -2.6v on all 8 channels, caliaout 1 max does nothing, neither does changing the calibration voltage on the midibox itself.

I am trying to find very hard if I soldered something wrong but that it doesn’t seem like that.

 

Anybody any tip what I should do?

 

13

Ah I seem to have sucses.  When I disabled th aout_ng in the config, saved it and turned the midibox off. Then turned it on again, selected - aout-ng and tweaking the calibration voltages gives me output!!! ITS ALIVE!!!

It’s to bad that most likely the first dac was fine as well and this does look like a bug. (not sure)

I will continue the tests another day.

Cheers,

F*cking happy Tim

14

Btw found this small dc-dc conversters mentioned by Pichenette @MI ’ Traco Power TMR1-1222 or TRN1-1222’  so will try to use this for a ±12V psu

15

This is good news. It might help me in my quest to get Aout_NG working, thanks for the update.

16

Hi Slo,  i hope you will solve it and make it working. I still did not have time to do the full testing. 

Anyhow good luck and maybe post you progress here.

Cheers

 

Tim

1 Like
17

Great that this helped at your side! :slight_smile:

But for the records: currently I’m not able to reproduce this issue.

The test procedure:

  • turn on MIDIbox with unconfigured AOUT module
  • in CV page selected AOUT_NG module
  • exit CV page (so that this setting will be stored)
  • power-cycle MBSEQ
  • -> AOUT_NG properly configured and working
  • can be repeated with multiple power-cycles: AOUT_NG properly configured and working

Best Regards, Thorsten.

18

Hi T,

Only 1 thing i did not mention is that I applied a bit off pressure on the tl074’s so most likely i did something wrong. Maybe the contact wasn’t ok before. Althought ±12v was there.

I will try if i can reproduce it on my side. But if i do than highly likely I did something wrong here.

 

Cheers

Tim

19

I am not able to reproduce the bug at all. Aoutng just working fine.