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Old 18th March 2016, 02:05 PM   #1
museguy is offline museguy  Mexico
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Default Noob Building a α20 Headphone Amp

Hi All,
Please be kind, this is my first DIY build. Planning on a a20 with sigma 25 power supply.

Raspberry Pi > DAC > a20 with Sigma 25 > headphones (Sennheiser HD650, Sony MDR7506, Grado SR80, ACS Custom IEM, Denon D2000)

So far have ordered:
(1) Potentiometer
(1) Volume Knob
(2) a20
(2) Sigma 25
(2) Toroidal Transformer
(1) Headphone Connector
(1) IEC with on/off and fuse
(2) RCA Connectors

Thinking I will figure out the Raspberry Pi > Dac once I have the headphone amp built. Welcome suggestions !

A big thank you to Hikari1 for his guidance.

Thanks, Mark
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Old 18th March 2016, 02:22 PM   #2
museguy is offline museguy  Mexico
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Hi All,

Thinking about this Dac with the Raspberry Pi
I2S Dac

Have found some information about the I2S connection to the Dac

Would appreciate any feedback.

Thanks,
-Mark
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Old 18th March 2016, 02:37 PM   #3
Bibio is offline Bibio  Scotland
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i use a RPi/dac/headphone amp combo and it sounds pretty good to my ears. i use moode with the RPi/DAC combo.

the pi, is very picky of power and ground loops so take care with that.

at the moment i have the RPi with iqaudio dac+ and i power this off a LM7805 and 12v wallwart which is not the best solution. the only problem i have is a ground loop. the RPI is silent and the headphone amp is silent but plug them both together and it creates a ground loop so you might want to think of the RPi and the amp as one unit taking power from a single multi volt supply.
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Old 18th March 2016, 04:49 PM   #4
museguy is offline museguy  Mexico
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Quote:
Originally Posted by Bibio View Post
i use a RPi/dac/headphone amp combo and it sounds pretty good to my ears. i use moode with the RPi/DAC combo.

the pi, is very picky of power and ground loops so take care with that.

at the moment i have the RPi with iqaudio dac+ and i power this off a LM7805 and 12v wallwart which is not the best solution. the only problem i have is a ground loop. the RPI is silent and the headphone amp is silent but plug them both together and it creates a ground loop so you might want to think of the RPi and the amp as one unit taking power from a single multi volt supply.
Dear Bibio,
Thank you for the suggestions about ground loop.
All the best,
-Mark
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Old 19th March 2016, 03:54 AM   #5
museguy is offline museguy  Mexico
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Starting to look for a DAC.

Tonight found the AK4495SEQ I2S by Weiliang.

The Weiliang AK4495 seems to be getting good reactions

Any thoughts ?
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Old 23rd May 2016, 05:37 PM   #6
museguy is offline museguy  Mexico
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Default sigma 25s finished

Hi All,
Working slowly, finished the two sigma 25s last night, both reading 4.95 volts. Now starting on the alpha 20 boards.

Still have not decided about a DAC to go with the alpha 20

Thank you for the encouragement !

Click the image to open in full size.
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Last edited by museguy; 23rd May 2016 at 05:44 PM.
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Old 25th May 2016, 09:28 AM   #7
Dimdim is online now Dimdim  Greece
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I use a couple of α20s to drive my Fostex T50RP MKIIIs and I'm very pleased with the result.

Be sure to set the gain of the α20s appropriately..

But 5VDC sounds way too low. The α20s are specc'ed for +/-12VDC operation. I'm running mine on +/-18VDC with Salas BiB power supplies. The Fostexs like a lot of power.
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