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Input and switch boards for Soekris DAM1021 DAC

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#581
deimsch said:
Another question - as the diyinhk USB to I2s non-isolated interface seems to be no longer available, is there an actual diyinhk interface that would work as well? Wave i/o or Amanero are a bit exoensive ... 🙂
Click to expand...

Probably any diyinhk USB-I2S interface will work, but they appear to be bigger and may have a different pinout, so you would have to wire them instead of directly plugging in. And they are not that cheap anymore...

Besides, I blew up my old diyinhk interface with static discharge while plugging in the USB cable. It also destroyed the input board regulators and the I2S isolators in DAM1021... All because the diyinhk USB port did not have ESD protection and, judging by the photos, the new ones don't have it either. So I no longer recommend diyinhk as a good choice.

I don´t know why via the 7-9V power supply my input board doesn´t behavior as it should, but I’m very happy that I found a way to get this thing running!
Click to expand...
I suspect you had reversed polarity of the 7V input. The sole purpose of IRF9333 is to protect against accidentally reversing the input polarity and destroying the rest of the board. The symptoms you described look like it was doing its job 😉
 
#582
I ask for an advice about what might be the best to do next. I bought a DAM 1021, a DIYINHK USB to I2S, and have organised with power supply- all works find. Then I found a non used version of the input and switch board in the swap. I realised when I got it that it is a 1.1 board. Now I would like to use it with both a raspberry and USB. I can of course put a hat on the raspberry that gives spdif output (Allo makes a nice one), but would it be possible for a noob like me to imitate the elegant solution on the ver 2.0 board, or should I drop that idea?
Another question, that I can see have been touched in this thread - do any of you have a step to step description of how to switch filters at the 1021 with a raspberry, alternatively with a physical switch somehow?
 
#583
I don't think there is an elegant way to make the 1.1 board into a V2 board. An inelegant way would be to use an Twisted Pair Otto to allow for switching the I2S between USB and Pi and then connecting between the header on the input board and the OTTO. You would have to set up a way to switch between the I2S outputs since the switch board would only switch to the I2S header on the input board.
 
#584
Thank you - I was not aware of the OTTO. Although not as elegant as ver 2, it seems to be able to do the job in a simple way. I have been looking into the PDF for the Buffalo III. The task is obviously to make the lines as short asa possible. However what is not clear to me is how I deal with the three connections into - and out of the OTTO (Data, BCK, LRCK?). Any advice?
 
#585
OTTO can accept U.Fl, pin headers, or direct wire. From the USB and the pi pin headers to pin headers on the OTTO would be the easiest. U.Fl. or pin headers from the OTTO to the input board. Run the USB into B1, Pi into B2, and the input board into A. Just use 3 of the 4 positions, since the Dam-1021 doesn't take a MCLK signal.
 
#587
wcwc said:
I don't think there is an elegant way to make the 1.1 board into a V2 board. An inelegant way would be to use an Twisted Pair Otto to allow for switching the I2S between USB and Pi and then connecting between the header on the input board and the OTTO. You would have to set up a way to switch between the I2S outputs since the switch board would only switch to the I2S header on the input board.
Click to expand...

Thank you so much for the tip. Bought an OTTO II, and it works excellently with the DIYINHK xmos I2S board and a raspberry running Roon from Ropieee. I took the 5 V from the raspberry. I manage to make a physical configuration where the wires are really short, max 3 cm.
 
#591
meldano said:
Thanks to my mechanical colleague and mathew.
Click to expand...
Can I use this mechanical drawing for making the back panel cut out for this input board having BNC, Optical and USB ports and ignoring the Raspberry Pi cut outs? Even though an old post I guess it works fine as I got the input board recently and would like to use this cut outs to mount Amanero and Soekris 1021 Rev 7 board the latest one.

Thanks
 
#593
This ones (Input and Output/Mute board)? If yes sen me an PM.

IMG_5817D.JPG
 
#594
normundss said:
At this time all the boards are sold out!

This is a group buy for a set of input and switch boards for the Soekris DAM1021 DAC.

Documentation can be downloaded here (PDF on Google Drive).

The Gerber files for the latest versions of the boards are posted in #580.
The schematics for input and switch boards are posted in #332.
Schematic and PCB design for a power supply are posted in #325.

More information about the muting module can be found in posts #237, #259 and #263. The schematic is posted in #262. Muting boards are now sold out. Gerber files for making your own boards are posted in #454.

Input board BOM: https://docs.google.com/spreadsheets/d/1ENt40kTZhL9ITpYthZ8c4qUfL6y8ajTpFsxg7ic-8vU/edit?usp=sharing
Switch board BOM: https://docs.google.com/spreadsheets/d/1gz4L44eWwEkDHWcEnBIwdIYa3pOwWgeSbLcd3dcf6AY/edit?usp=sharing
Muting board BOM: https://docs.google.com/spreadsheets/d/1mkKxl3J7ERI1Ij2h5PFqQ5qZ6s5hMIRs1WoFZ5Vm1gg/edit?usp=sharing

The default RPi connector PCB for V2 boards is designed for Raspberry Pi 2 and B+ models. If you are interested in connectivity for older Raspberry Pi A/B models or Arduino, and have not indicated it on the original signup sheet, please post on the thread.

Pricing:
Input board bare PCB: Sold out
Switch board bare PCB: Sold out
Assembled input board kit: Sold out
Assembled switch board kit: Sold out
Additional input board parts for balanced build: 5 EUR
Shipping anywhere in the world: 9 EUR

Assembled muting board kit: Sold out
Additional muting board parts for balanced build: Sold out

Input V2 features
  • Stacks on top of DAM1021.
  • Directly connects to J3 and J2 headers on the DAC without additional cabling.
  • Directly connects to Amanero USB adapter without additional cabling.
  • Directly connects to DIYINHK USB interface (the non-isolated version) without additional cabling.
  • Easy ribbon cable connection to WaveIO USB interface.
  • Directly connects to Raspberry Pi without additional cabling.
  • Additional connector PCBs can be designed to use other microcontrollers such as Arduino, BeagleBone Black, etc.
  • Can be controlled using the isolated serial port.
  • Serial port control from Raspberry Pi.
  • Coaxial SPDIF input with BNC connector footprint.
  • Optical TOSLINK input with footprints for Toshiba TORX147L and Cliff Electronics ORJ-5 receivers.
  • U.FL sockets for other I2S sources (can be installed, but not used simultaneously with Amanero/DIYINHK).
  • Optional U.FL sockets for Amanero MCLK OUT, I2S MCLK OUT, FPGA SLV and FPGA MCLK OUT lines.
  • External connections possible to ALL pins on DAM1021 J2 and J3, and to Raspberry Pi GPIO connector.
  • Two selectable I2S inputs.
  • Built-in regulated power supply for the isolated digital part/muting module/USB/RPi/other microcontrollers.
  • Amanero/DIYINHK USB status lines readable from Raspberry GPIO pins. WaveIO USB status lines can also be connected by manual wiring.
  • Supports true balanced configuration with two DAM1021 DACs. A single input board is needed for dual-DAM balanced build.
  • For true balanced configuration the second DAM1021 stacks directly on top.
  • Supports serial port chaining for true balanced configuration.
  • Supports separate access to each serial port for true balanced configuration.
  • EMI filters on I2S lines to reduce high frequency noise pollution.

Switch V2 features
The switch board allows DAM1021 input selection and volume adjustment by use of mechanical switch and potentiometer. It is not required if DAM1021 will be controlled exclusively by a microcontroller via serial port.
  • Includes a rotary switch for input selection
  • Input selections are "Auto", "TOSLINK", "COAX", "I2S-1" and "I2S-2".
  • Allows connecting a potentiometer for volume control.
  • Footprints for front panel indicator LEDs for DAM1021 POWERLED and input selection.
  • Includes ribbon cable for easy connection to the input board.
  • Supports true balanced configuration with two DAM1021 DACs. A single switch board is needed for dual-DAM balanced build.
  • It is an optional accessory for the input board and is not useable separately.

Muting board with alternative output buffer option.
Muting is done by shunting the unbuffered outputs to ground with normally closed relay contacts. When the relay turns on, mute is off. Since the DAM1021 pin18 muting control does not work properly as of the current firmware release, and it can be quite difficult to attach wiring directly to that pin, the mute control is implemented independently.
  • Stacks directly onto DAM1021 J7 header (the unbuffered outputs).
  • Fits even with the onboard XLR connectors mounted (although I do not recommend using them).
  • Power-on muting uses a delay circuit which turns on the outputs approximately 8 seconds after power is applied.
  • Power-off muting uses AC detection and will mute the outputs within approximately 30 ms after loss of AC power.
  • Optionally these timer based circuits can be bypassed and pin18 driven control can be implemented.
  • Includes PCB footprints for implementing SE to balanced output buffers using THAT1646/DRV134 chips using easy to solder through hole parts.
  • Supports true balanced configuration with two DAM1021 DACs. A single muting board is needed for dual-DAM balanced build.
  • Includes PCB footprints for implementing true balanced output buffers using THAT1606 chips (only available in TSSOP-16 packaging, quite fine pitched SMD parts).
  • For true balanced configuration the second DAM1021 stacks directly on top.

It should be possible to use the balanced unbuffered hardware setup for a 2-way crossover in single ended mode, although it has not been tested.

This wiki page contains documentation for the old V1.1 release of the input board.
Click to expand...
Does anyone have the old V1.1 release documentation as the above link seems to be not working. I got the version 1.1 from a member and trying to figure out how to power up this input selection module with my latest Soekris 1021 Version dac.

Thanks
 
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