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Old 31st January 2015, 10:13 AM   #1181
AR2 is offline AR2  United States
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Just to report, I received my DAC today. Easy set up, beautiful board. Have it running with Arduino. Tried only single ended. Great sound, well balanced, detailed and warm. Not a trace of harshness. I am very happy. The best part is that is so easy to set it up. Easy power supply, easy with output. I am running it straight to amps. This is such a pleasure project. Thank you Soekris!

I will be so happy to have it as a crossover when available. I do not know how you will make it in regards to the clock, but it would be great to have as well, an additional clock output to run source in the slave mode.

Looking forward for the development while enjoying great sound!
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Old 31st January 2015, 10:24 AM   #1182
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Quote:
Originally Posted by AR2 View Post
Just to report, I received my DAC today. Easy set up, beautiful board. Have it running with Arduino. Tried only single ended. Great sound, well balanced, detailed and warm. Not a trace of harshness. I am very happy. The best part is that is so easy to set it up. Easy power supply, easy with output. I am running it straight to amps. This is such a pleasure project. Thank you Soekris!

I will be so happy to have it as a crossover when available. I do not know how you will make it in regards to the clock, but it would be great to have as well, an additional clock output to run source in the slave mode.

Looking forward for the development while enjoying great sound!
Hi
Some pictures to show us your project

Thanks
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Old 31st January 2015, 10:35 AM   #1183
TNT is offline TNT  Sweden
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Originally Posted by soekris View Post
Oouch, sorry to hear that. But it could actually happen with any potmeter where you loses gnd.

The R-2R DAC actually have a little failsafe as it will not add gain until set at or below 0db first. But that just at power up, no protection against sudden problems.... But in contrary to an analog potmeter, I have a uC in control and will look into adding additional failsafe, one possibility is if potmeter goes up too fast it should be detected as error.
Your last point is briliant. Please implement and with an error signal somehow (green led flash cadence)

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Old 31st January 2015, 11:06 AM   #1184
TNT is offline TNT  Sweden
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What is the worst load the unbuffered outputs should see ideally?

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Old 31st January 2015, 02:06 PM   #1185
soekris is offline soekris  Denmark
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What is the worst load the unbuffered outputs should see ideally?

//
No real limitation, the direct R-2R output is like a voltage source with 625 ohms pure resistor in series, any load will just lower the output voltage as per ohms law....

The RC filters cut off frequency will be higher with heavy load, so I would say don't go below 2 Kohm.
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Old 31st January 2015, 11:05 PM   #1186
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dam1021 uManager Rev 0.80 20150121 FPGA Rev 0.8 Press ? for help.

No 0.9 after PW cycle...

used ZTERM on OS X

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ZTERM on OS X works fine providing you use the right settings. I've just done the 0.9 update using a MacBook Pro, Z-Term and a USB-Serial adapter marked UC-232A and it worked first time.

If you go to File > Transfer Covert then select "Binary", rather than the default "Smart MacBinary" you shouldn't have any trouble. I'd been tripped up by this setting updating firmware on a Soekris SBC. "Smart MacBinary" seems to mangle the firmware.
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Old 31st January 2015, 11:07 PM   #1187
TNT is offline TNT  Sweden
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Aha - thanks! Good.

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Old 1st February 2015, 01:03 AM   #1188
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Originally Posted by spzzzzkt View Post
ZTERM on OS X works fine providing you use the right settings. I've just done the 0.9 update using a MacBook Pro, Z-Term and a USB-Serial adapter marked UC-232A and it worked first time.
Once you've got a de9 serial plug attached, what is the wiring standard to the connector on the board? It looks like with a d9 txd is 3, Rxd is 2, and gnd is 7--so just these three wires would get attached to the DAC board?

Last edited by picovolt; 1st February 2015 at 01:07 AM. Reason: Correcting the darn spellchecker
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Old 1st February 2015, 01:20 AM   #1189
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Originally Posted by picovolt View Post
Once you've got a de9 serial plug attached, what is the wiring standard to the connector on the board? It looks like with a d9 txd is 3, Rxd is 2, and gnd is 7--so just these three wires would get attached to the DAC board?
What I have is:

RS232_RXD -> DB9-3 ( Transmit Data)
RS232_TXD -> DB9-2 (Receive Data)
RS232_GND -> DB9-5 (Signal Ground)

I used a 10 pin IDC header and ribbon cable, then isolated the required wires and soldered to DB9 plug. I only have three wires connected at the DB9 end.
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Old 1st February 2015, 02:48 AM   #1190
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A big thanks to Søren for putting this project together! I'm definitely interested in a board but going through tough times right now in Ukraine. I hope these boards will be available for quite some time
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