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Author: DigitalToys

HiFi DACs for Orange Pi

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Published in 2015-5-1 02:50:05 | Show all floors
DigitalToys replied at 2015-5-1 00:33
Freliix, we are not talking about amplifying the output signals from the Orange Pi, but how to impro ...

I have not tried any platform, I hope the arrival of my orange pi +. I'll use a amplier, see what happens

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Published in 2015-5-1 04:12:56 | Show all floors
Use a decent usb audio dongle which is supported by Linux

Frans
You can also reach me on freenode irc, channel #orangepi username eFfeM

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Published in 2015-5-1 06:00:24 | Show all floors
I already use a little amplifier (2x5w, here) and the sound is audible, but there's a lot of parasites. Maybe a pre-ampli (like this) could reduce them, I havn't try.
My project is in pause, I'm waiting for larger cells.

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 Author| Published in 2015-5-1 14:00:20 | Show all floors
Edited by DigitalToys at 2015-5-1 08:06

Guys, we're moving away from the initial thread topic: this is not about amplification! Please open another thread if you want to discuss about suitable amplifiers!

@FransM: there are no decent USB dongles under 30,- Euro, the DAC I mentioned in the first post only costs half the price. Furthermore, if you want to put everything in a case, I think a board is much easier to handle than a USB stick, especially when it comes to the outputs.
@gaara: I dought that you can improve the quality with a preamp. If the signal is not delivered properly, no amp could turn it into something good... so I would start earlier, the digital to analog conversion has to be improved.
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Published in 2015-5-3 22:47:34 | Show all floors
Edited by gaara at 2015-5-3 16:48

Do you think a mini DAC like this is enough to plug 2x2W speakers ?Or need bigger like this ?

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Published in 2015-5-4 00:50:06 | Show all floors
Edited by t3l3m4k0 at 2015-5-3 17:52
gaara replied at 2015-5-3 15:47
Do you think a mini DAC like this is enough to plug 2x2W speakers ?Or need bigger like this ?


All of them have same chip, PCM2704, and low distortion ,THD + N: 0.006% (RL> 10 K), but output power is 12 mW (RL = 32), enough for  a earphones but not enough for unpowered speakers. You must put one amp on output.

There is cheap ones with veri good performance,
http://www.aliexpress.com/item/T ... mp/32331577069.html




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Published in 2015-5-4 02:02:37 | Show all floors
Ok, thanks for your notice.
I already have an amplifier (with a volume potentiometer) , so now, I'm looking for a good little DAC, with usb interface, because I can't pilot GPIO ports with Android.

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 Author| Published in 2015-5-7 13:52:17 | Show all floors
Gaara, look at htis one: https://www.indiegogo.com/projec ... ic-anytime-anywhere

Seems interesting, I already preordered one, will post my experiences here once it arrives.
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Published in 2015-5-7 16:23:31 | Show all floors
Yes, looks cheap for this quality (192kHz & 24 bits).
But for my 2W speakers, does I need a quality like this ?
Anyway, I'm waiting for your try !

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 Author| Published in 2015-5-21 15:29:38 | Show all floors
Ok, the DAC arrived yesterday. Connected it to a RPi B running Volumio to test it, works great! I tried to figure out how to connect it to the Orange Pi, but did not succeed yet. On the RPi, I used the P5 header to connect the DAC to the following pins:

Data:
Orange (MCLK) > not connected
Yellow (GND) > Pin 7 (GND)
White: (DATA) > Pin 6 (GPIO31)
Red (LRCK) > Pin 4 (GPIO29/I2C0_SCL)
Black (BCK) > Pin 3 (GPIO28/I2C0_SDA)

Power:
Red (+5V) > Pin 1 (5V)
Black (GND) > not connected

I was trying to find the corresponding pins in the Orange Pi manual, but apart from +5V and GND, I am not sure which pins to use and how to assign them...

Hoping for the Linux gurus now to help me further...
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