Schematic_Toscanini2022-09-05.pdf

Toscanini is an evolution from Kubelik and Dorati which eeks out more current from the DAC chips by tweaking their reference voltage (pin 7). More current gives lower noise and clearer sound.

Adobe Portable Document Format - 210.79 kB - 02/12/2023 at 03:38

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Schematic_Dorati_2022-05-13.pdf

Dorati is the evolution of Kubelik through deleting the opamps. So now it qualifies as a 'multibit DAC with fully discrete output stage'. Also it foregoes the inter-sample over headroom that was a feature of Kubelik and operates on a more convenient 12-15V power rail.

Adobe Portable Document Format - 185.19 kB - 05/24/2022 at 09:10

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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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