It's still only just after 1pm SF time, and as everything is going UPS I would expect that anything shipping today would ship en masse closer to 4 or 5 pm. That said I'm guessing that there would have been a lot more excitement from less excitable Europeans if anything had gone out.
Does it mean that you have shipping confirmation? My order still says processing...
No-one has reported that they have recieved shipping notification.
Sorry for the delay, I have plenty of boards ready, but have been working like an insane to get the firmware done for release. Which I have now, so now testing starts, should have the first ones ready for delivery Wednesday or Thursday to the webshops, the one in Denmark will get first as that is just a short drive to my brother, the one in USA will take a few days for shipping across the pond.
So what can the Soekris dam1021 Sign Magnitude R-2R DAC do now:
1) It plays everything over I2S, tested up to 192K but should do 384K.
2) It plays at least to 96K over SPDIF Toslink, and probably up to 192K over SPDIF Coax, but have problems generating test signals as that require software that actually works doing ASIO with channel select, my EMU-0404 use ch 1-2 for analog, ch 3-4 for SPDIF....
3) Automatic detect and support for digital De-Emphasis, for those old CD's.
4) Full set of relative simple and short FIR filters for all rates, but supports filters with up to 1016 coefficients at 48K. Docs and Software Utility to change them included, can also load bypass filters for NOS use. But after seing the ugly spectrum I don't recommend NOS....
5) Digital Volume Control, from -90 to +15 db in 1 db steps, both using a simple potentiometer and control codes over the serial port.
6) Input Selection, Automatic or Manual using control codes over the serial port.
7) Reclocking FIFO with automatic clock tracking works like a charm, syncronize to < 1ppm at anything withing 1% range, and then tracks using a software PLL with 0.02 Hz Lowpass Filter and with 0.02ppm step changes.
8) Tested with 7W toroid transformer. Measured 0.4V PP Ripple on input capacitors, couldn't hear anything but did see 50 hz at -135 db, most likely things going into the measurement cable as it changed when moving things around...
9) Everything can be updated by downloading over a standard PC type serial port.
Functions waiting for next firmware release (which should be soon):
1) DSD Support, should be relative simple, more a question about test setup with software and sound files....
2) Cascading for Digital Crossover use, the 14 pcs IIR Biquads are there (needed one for De-emphasis), and I want the function for my own speakers. If I can figure out how to calculate coefficients without trig functions then it can probably fit into the 32Kbyte in the uC....
3) Cascading for Balanced use.
And whatever I forgot to mention....
So what can the Soekris dam1021 Sign Magnitude R-2R DAC do now:
1) It plays everything over I2S, tested up to 192K but should do 384K.
2) It plays at least to 96K over SPDIF Toslink, and probably up to 192K over SPDIF Coax, but have problems generating test signals as that require software that actually works doing ASIO with channel select, my EMU-0404 use ch 1-2 for analog, ch 3-4 for SPDIF....
3) Automatic detect and support for digital De-Emphasis, for those old CD's.
4) Full set of relative simple and short FIR filters for all rates, but supports filters with up to 1016 coefficients at 48K. Docs and Software Utility to change them included, can also load bypass filters for NOS use. But after seing the ugly spectrum I don't recommend NOS....
5) Digital Volume Control, from -90 to +15 db in 1 db steps, both using a simple potentiometer and control codes over the serial port.
6) Input Selection, Automatic or Manual using control codes over the serial port.
7) Reclocking FIFO with automatic clock tracking works like a charm, syncronize to < 1ppm at anything withing 1% range, and then tracks using a software PLL with 0.02 Hz Lowpass Filter and with 0.02ppm step changes.
8) Tested with 7W toroid transformer. Measured 0.4V PP Ripple on input capacitors, couldn't hear anything but did see 50 hz at -135 db, most likely things going into the measurement cable as it changed when moving things around...
9) Everything can be updated by downloading over a standard PC type serial port.
Functions waiting for next firmware release (which should be soon):
1) DSD Support, should be relative simple, more a question about test setup with software and sound files....
2) Cascading for Digital Crossover use, the 14 pcs IIR Biquads are there (needed one for De-emphasis), and I want the function for my own speakers. If I can figure out how to calculate coefficients without trig functions then it can probably fit into the 32Kbyte in the uC....
3) Cascading for Balanced use.
And whatever I forgot to mention....
Soekris
Sounds great that the project is moving on.
One of my friend is very interested in buying a few sets of the DAC board.
He asks if he can set the analog output as high as 12V.
(of course, the power for the DAC needs to raise a bit too.)
He is using a self-made DSP for crossover and room correction which
needs high voltage output to maintain good S/N ratio.
Sounds great that the project is moving on.
One of my friend is very interested in buying a few sets of the DAC board.
He asks if he can set the analog output as high as 12V.
(of course, the power for the DAC needs to raise a bit too.)
He is using a self-made DSP for crossover and room correction which
needs high voltage output to maintain good S/N ratio.
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There are headers for the I2S, AES/EBU, RCA, TOSLINK inputs. You need to provide the hardware for the inputs you require.
- USB -> I2S board (for example Luckit, Amanero, DIYINHK, etc, etc, etc)
- AES/EBU: XLR socket + pulse transformer + resistor
- RCA SPDIF: RCA + pulse transformer + resistor
- TOSLINK: Toslink Receiver + 3.3VDC supply, capacitor and inductor.
TOSLINK is the only input that requires a power supply - not sure if the DAM1021 board provides a place to tap 3,3V for this purpose?
Most DIY USB->I2S interfaces use USB power.
You should be able to build the AES/EBU, RCA and TOSLINK inputs on proto board to get up and running as they are pretty minimal.
Dear Søren,
Do not feel pushed about anyhting, everybody here has been patiently waiting for the boards to become available for months, now that it is close it is quite normal the excitement to take over. I believe that if you enjoy what you are doing and doing it without any stress we will all benefit a lot, a mature product will be a much more successful story than just a board with a lot of potential.
Do not feel pushed about anyhting, everybody here has been patiently waiting for the boards to become available for months, now that it is close it is quite normal the excitement to take over. I believe that if you enjoy what you are doing and doing it without any stress we will all benefit a lot, a mature product will be a much more successful story than just a board with a lot of potential.
Hi,
Do you know if the Amareno can be powersupplied by an external PS than its USB ? Could be a good enough candidate as the Soekris has an isolator and a Fifo !
For the SPIDF, i should advise BNC plugs and matched impedance wire if the source provides also a BNC output... RCAs certified at 75 ohms are hard too source. I use some pcb BNC receiver with leads : I just plan to connect it with a pulse transformer leads to leads soldered (as saw in the Implementation thread) for the shortest pass as the to reduce the numbers of soldering wires interconections !
Do you know if the Amareno can be powersupplied by an external PS than its USB ? Could be a good enough candidate as the Soekris has an isolator and a Fifo !
For the SPIDF, i should advise BNC plugs and matched impedance wire if the source provides also a BNC output... RCAs certified at 75 ohms are hard too source. I use some pcb BNC receiver with leads : I just plan to connect it with a pulse transformer leads to leads soldered (as saw in the Implementation thread) for the shortest pass as the to reduce the numbers of soldering wires interconections !
I use an Amanero board in my current DAC, and the DAC powers the Amanero board with 3.3V. You need to remove a little, 3 pin regulator to do this. Also, I think this still leaves one chip powered by USB power, I'm pretty sure my Amanero won't work unless it has USB power too.
And from what I understand, RCA's are never really 75 ohm, so I definitely agree that if you use SPDIF, go with BNCs. I know some companies claim to make 75 ohm RCAs.
Randy
thanks for this information. Amareno can be found at 60 euros here.
Since the good people from Subbu's threads adviced me, I maid this with my spidf streamer (SB Duet) : full 75 ohms. It gave me a subjective larger band and much better bass. (of course th DAC side has a BNC plug as well)
Since the good people from Subbu's threads adviced me, I maid this with my spidf streamer (SB Duet) : full 75 ohms. It gave me a subjective larger band and much better bass. (of course th DAC side has a BNC plug as well)
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