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Old 19th July 2009, 07:59 PM   #151
hotzman is offline hotzman  Romania
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Hey guys,
I'm glad I managed to complete this project. I bought the kit from Spencer helped a friend in Bucharest (vitalica-member of this forum).
Besides improvements to Spencer, I have used more super regulators from newclassd, PMD100 Board and R-core transformers.
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Old 5th August 2009, 12:50 PM   #152
spencer is offline spencer  Hong Kong
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The is the FFT measurement of D1V33 DAC. Note the rich 2nd and 3rd harmonics and also the low noise floor about -115dBV.

The DAC is with PCM63P-K and digital input is at Full Scale 16bit 44.1kHz Sampling rate.
Attached Files
File Type: pdf d-a fft dac d1v33 fft l+r.pdf (23.0 KB, 164 views)
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Old 5th August 2009, 12:51 PM   #153
spencer is offline spencer  Hong Kong
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When the DAC is switched to PCM1704, a lower noise floor is seen close to -120dbV. Attached is the FFT.
Attached Files
File Type: pdf d-a fft dac d1v33 1704dac.pdf (18.1 KB, 142 views)
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Old 23rd September 2009, 02:55 PM   #154
spencer is offline spencer  Hong Kong
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Squeezebox SB3 slave to D1V3 clock:

Put a 11.2896Mhz clock and other regulator parts in D1V3, R95 change to 330 ohm and then put a 220 ohm at J20 "CLK to G". This is to reduce the 5V clock peak peak level to about 3.3V for SB3 use. Connect the clock out via a SMA size coaxial cable and BNC socket as shown.

One the SB3 side, remove Y1, cut trace between HC04 pin 8 and crystal pad. Use the coaxial cable, connect the center wire to pin 9 of HC04. The ground pin connect to crystal pad which is then grounded to pcb to the nearest cap ground pin.

On D1V3, set jumper J9 to XO side. Power up D1V3 and then SB3. Play music as usual. Note that a hard reset on SB3 is required if the SB3 input clock is off before.

Note that I do not see much improvement on the digital out of SB3 by using linear power supply or adding a pulse transformer at the digital output.

Enjoy!
Attached Images
File Type: jpg D1V3 clock mod1.jpg (62.5 KB, 606 views)
File Type: jpg SB3 mod1.jpg (54.1 KB, 606 views)
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Old 24th September 2009, 08:47 AM   #155
spencer is offline spencer  Hong Kong
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Further use a separate 3.3V regulator for CPLD and HCU04 ICs. See photo.

Since the D1V3 is locked to 11.2896MHz super clock, 48kHz Fs signal will not be decoded by it.
Attached Images
File Type: jpg SB3 CPLD_HCU04 PS mod.JPG (64.8 KB, 578 views)
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Old 24th September 2009, 08:54 AM   #156
spencer is offline spencer  Hong Kong
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Here is the AP FFT measurement on the digital out of SB3 when playing back 1kHz and 18kHz files. Note that it is the FFT without the D1V3 DAC part.

My AP FFT cannot tell any difference between original SB3 or clock/regulator modifications. Guess it is due to the very low jitter level of the signal at the SPDIF digital out of SB3.

The improved sonic on D1V3 is observed due to the use of low jitter supper clock at the XTI of SM5842 digital filter chip.
Attached Files
File Type: pdf FFT RCA digital out @ 1k sw ps.pdf (36.9 KB, 55 views)
File Type: pdf FFT RCA digital out @ 18kHz sw ps.pdf (36.0 KB, 34 views)
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Old 19th October 2009, 11:26 AM   #157
spencer is offline spencer  Hong Kong
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I have created my blog here:

http://www.fetaudio.com/

You can save your time to go through the whole thread if you are interested in D1V3 or D1V33 information. Thanks for visiting.
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Old 27th October 2009, 10:26 AM   #158
akira is offline akira  France
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Hi Spencer,

I have bought (second hand) the kit (D1V33 with PCM63) from another french guy who did not start to solder anything yet. I am wondering if you plan to sell the PCM63->PCM1704 adapter card that is to be seen on your blog ?

If not, do you think that other adapters (like monarchyaudio, etc ...) may work ?

Anyway I am not in a hurry, I have not started to mount the components yet ...

Thanks

Akira
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Old 27th October 2009, 12:37 PM   #159
spencer is offline spencer  Hong Kong
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Akira,

The adaptor pcb I am using is for PCM1702 design. Also the pad width is a bit wide and thus I need to straighten the leads of the IC before I can solder the chip on the pcb! Moreover PCM1704 has two supplier pins reversed compare to PCM1702. The board I do thus need to cut trace and jump two wires on every converter and is mainly for my testing only and not able to offer for sales.

I think if any converter board is compatible for PCM63 pin assignment, then it should work as it is not really difficult to do the pcb.

Anyway you can ask again when you have you PCM63 running on the kit.
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Old 27th October 2009, 12:52 PM   #160
akira is offline akira  France
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OK Great.

Anyway it is a long way 'til I get it running (with the PCM63) ... The shielding of the capacitors looks ... exciting. I guess, I'll have some fun building it.

Thanks again for the quick answer.
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