Schematic_PhiDAC hex 5.26.pdf

Updated PhiDAC hex schematic - this one corresponds to the kits which are available for sale on DIYAudio. Minor updates to the level shifters and a swap from CJ431 to TL431 for improved reliability in case a DAC chip draws too much current.

Adobe Portable Document Format - 247.85 kB - 07/14/2020 at 10:56

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simple filter.zip

Gerbers for 3rd order (low cost) filter daughter board for PhiDAC hex. Using pre-selected TDK 7mm inductors.

x-zip-compressed - 44.62 kB - 05/13/2020 at 09:07

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7th order filter.zip

Gerber set for 7th order daughter board filter for PhiDAC hex. Using P14 ferrite cored inductors.

x-zip-compressed - 105.25 kB - 05/13/2020 at 09:05

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gerber phiDAC hex.zip

Gerbers for 2020 updated version of PhiDAC - using 6 paralleled DACs and off-board filtering.

x-zip-compressed - 158.07 kB - 05/13/2020 at 09:03

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phiDACrevG.xlsx

Costed BOM for PhiDAC, Taobao component prices.

sheet - 12.90 kB - 02/20/2019 at 08:00

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Gerber phiDAC v1.zip

Manufacturing data (Gerber & drill files) for the PhiDAC PCB.

x-zip-compressed - 97.97 kB - 02/20/2019 at 07:58

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Schematic- phiDAC revised.pdf

Son-of-lingDAC is called PhiDAC - its much simpler, easier to build and cuts the labour involved in creating an audiophile-sounding DAC by half to two thirds.

Adobe Portable Document Format - 71.67 kB - 01/08/2019 at 07:01

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Schematic_0DAC-dac.pdf

DAC board. Various changes to this, too many to list here.

Adobe Portable Document Format - 36.67 kB - 04/06/2018 at 12:46

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SEbuff.pdf

Top board of the 3 board stack, this can be configured as a line output or a headphone buffer to drive low impedance cans directly. The schematic as shown is the headphone variant, optimised for 56ohm cans (HD668B were the ones I tested with). To handle line out duty, reduce the output capacitor values (C5,C7), increase R10,R18 to 47k and reduce the bias (R8,16 change to 56ohm).

Adobe Portable Document Format - 26.21 kB - 04/06/2018 at 12:37

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lingDACfilter.pdf

v0.1 of the lingDAC filter schematic. Correction from v0 : values of C11,12 (now 2u2, were 1u).

Adobe Portable Document Format - 41.51 kB - 03/02/2018 at 13:02

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lingDAC_FR.png

Here's a measurement of the frequency response of a prototype lingDAC made by generating white noise in Audacity and recording it with a Sony PCM-M10 at 96kHz sample rate. Then examine the resulting file (30s long) in Audacity's 'Analyze - Plot Spectrum' function.

Portable Network Graphics (PNG) - 56.83 kB - 12/01/2017 at 00:55

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AIF1fr.jpg

LTspice frequency response plot of AIF1. The rise at the top of the audio band is to counteract the 'NOS droop'.

JPEG Image - 31.11 kB - 10/02/2017 at 07:06

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