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Pulsar Clock - Ultra Low Noise OCXO
Pulsar Clock - Ultra Low Noise OCXO
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Old 23rd September 2014, 09:11 PM   #11
Pulsar Clock is offline Pulsar Clock  Europe
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Pulsar Clock - Ultra Low Noise OCXO
Quote:
Originally Posted by clsidxxl View Post
Pulsar,technology Oven Controlled is it really beneficial for audio XO ?
Both our experience and the preliminary tests described on diyAudio by iancanada and Bunpei says: absolutely yes.
We experienced a sort of Live Effect, the music and the voice was incredibly natural.
We have not yet written about our own experience because we would like that other users could express their own impressions (I could say only any good ) instead we will post soon how we conducted our test because the description of the system that we used is surely interesting for the discussion.
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Old 2nd October 2014, 02:21 PM   #12
AxelFPS is offline AxelFPS  Russian Federation
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not listed frequency 33.8688MHz, with these parameters is available to order?
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Old 2nd October 2014, 09:24 PM   #13
Pulsar Clock is offline Pulsar Clock  Europe
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Pulsar Clock - Ultra Low Noise OCXO
Sorry AxelFPS,
currently we provide only the most diffused frequencies, the powers of two multiples of the two historical basic sampling rates: 44.1 kHz and 48 kHz for synchronous modes, and the 100 MHz frequency used in asynchronous mode.
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Old 7th October 2014, 05:35 PM   #14
Pulsar Clock is offline Pulsar Clock  Europe
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Pulsar Clock - Ultra Low Noise OCXO
Default Pulsar Clock Synchronous and Asynchronous Playback Test Setup

A Digital to Analog Converter is like an orchestra that plays music following the exact time stated by the Director, the Clock.
Each hesitation of the Director makes the orchestra less clean, more cloudy. At the same way a jittered clock makes even the best DAC sound more blurred loosing the details that makes music alive.
Due to its exceptionally low phase noise and a consequent negligible jitter the Pulsar Clock pushes at the top the performance of any DAC, to test this performance and compare different clocks we made two different setup for synchronous and asynchronous DAC convertion.
Great care was taken to minimize the hardware induced jitter compatibly with the need to realize a very flexible and easily reconfigurable structure to allocate different clocks and different frequencies.

Synchronous Configuration is described by the block diagram in picture S1, the whole hardware is shown in picture S2:
- Player: Volumio 1.4 from Michelangelo Guarise on Raspberry PI with I2S output, a bitperfect player up to 24/192. Picture S3 shows I2S connections from the Raspberry PI
- FIFO buffer from iancanada to synchronize the I2S data flow
- Isolator from iancanada to ehnance data accuracy providing galvanic isolation
- Pulsar Clock pair on Dual-XO board from iancanada, the location where the ultralow jitter reclock is made. Current DualXO version is able to power the Pulsar Clock pair both during the short warm-up and the operational phases. In our configuration we use a 5Vdc battery to supply the DualXO board with minimum noise. Picture S4 shows the "FIFO - Isolator - DualXO" de-jitter block
- ES9018 Buffalo III from Twisted Pear Audio powered by Pulsar Power boards on 3.3V Analog and Digital lines, the board was modified to accept an external clock on the dedicated three pins with the iancanada adapter. Pictures S5 and S6 show the most critical digital path, the connection between the DualXO and Buffalo III boards, this connection could be slightly improved in a fixed implementation but performs very well also in this flexible configuration
- NTD1 I-V Converter Version 3 from Owen, a stunning Class A converter with a state of the art linearity expressly designed to accomodate the Buffalo III board for maximum quality of the analog signal

Asynchronous Configuration is described by the block diagram in picture A1:
- Player: Volumio 1.4 from Michelangelo Guarise on Raspberry PI with I2S output, a bitperfect player up to 24/192
- ES9018 Buffalo III from Twisted Pear Audio powered by Pulsar Power boards on 3.3V Analog, Digital and Clock lines, the board was modified to accept an external clock on the dedicated three pins with the iancanada adapter. Picture A2 shows the Pulsar Clock on the iancanada clock adapter
- NTD1 I-V Converter Version 3 from Owen, a stunning Class A converter with a state of the art linearity expressly designed to accomodate the Buffalo III board for maximum quality of the analog signal
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Old 7th October 2014, 09:01 PM   #15
Greg Stewart is offline Greg Stewart  United States
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Also be interesting to see a setup with Acko's S03 or S04 isolator/synchronous reclocker board between the R-Pi and the Buffalo DAC. While the R-Pi can't take a clock input from the S03 or S04, I believe you could use it to provide both isolation and his 'pseudo-sync' mode with or without I2S signal reclocking.

Or even with a BBB & Miero's distro which CAN take a clock input from the S03 or S04?

Greg in Mississippi

P.S. Did you hear improvements in using your regulator module instead of TP's?
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Last edited by Greg Stewart; 7th October 2014 at 09:17 PM. Reason: Added BBB comment
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Old 8th October 2014, 06:53 PM   #16
Pulsar Clock is offline Pulsar Clock  Europe
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Greg,
for sure both Acko's "Digital Isolator & Re-clocker" and Ian's "FIFO - Isolator - DualXO" chain are excellent solutions to re-clock. While Ian's solution introduces the FIFO to synchronize data the S03 board delegates this task to the upstream device avoiding virtually any risk of full or empty buffer during long performances. We could implement also an S03 + BBB solution, we already have an S03 + Amanero USB isolator implementation, but the key point is the tricky installation of a DIL14 clock on a SMD native board.
Ian's system is DIL 14 native so it was the natural test solution for Pulsar Clock evaluation. Installing a DIL14 socket on the S03 board we espect the same benefits from Pulsar Clock independently by the upstream player, BBB Rpi or Amanero.
We hope that other users could be able to install DIL14 devices on SMD landing patterns in order to test different configurations.

About the Post Scriptum: Pulsar Power board was originally designed to power the Pulsar Clock at best so in that position it works very fine, I dare to say that in some cases it performs like a LiFePo4 battery, my favourite source for the clock. There are two advantages using the Pulsar Power board in place of a LiFePo4 battery, the first is obvious, it is always "ready to go" without need for battery re-charge.
The second is that LiFePo4 batteries fully charged easily reaches voltages above 4.00 V even using dedicated chargers, such "high" voltage for sure soon will burn a component and if this is an expensive clock or a DAC board it won't be fine.
You asked me if the Pulsar Power performs better than the TP ones. In my opinion we are not in the right position to spend a word on a comparison because obviously we like our products, so sorry for not answering this point.
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Old 8th October 2014, 07:33 PM   #17
clsidxxl is offline clsidxxl  France
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Pulsar,very nice configuration,my set up is very similar,Cubietruck/Volumio-I2S to FIFO/Isolator Digital-Dual XO/ Crysteck CCHD957(for now),I2StoPCMconvertorBoard to Audio GD Ref 7.1.I'm finished setting up,connexion,case aluminium for Cubietruck,proper implementation is critical.
With what you feed the Raspi?you should use UFL cable between the FIFO/Digital Isolator/XO Board.
You said
'''Pictures S5 and S6 show the most critical digital path, the connection between the DualXO and Buffalo III boards, this connection could be slightly improved in a fixed implementation but performs very well also in this flexible configuration'''' What do you mean by fixed implementation?

Last edited by clsidxxl; 8th October 2014 at 07:46 PM.
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Old 8th October 2014, 09:10 PM   #18
Greg Stewart is offline Greg Stewart  United States
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Pulsar,

Thanks for the explanation on why you chose those two test-beds and the difficulty of using your DIL14 device on the SMD S03/S04 boards.

Also appreciated your comments on your regulator.

Greg in Mississippi
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Old 9th October 2014, 12:30 PM   #19
pinnocchio is offline pinnocchio  Canada
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Is there a way to mod the BII to integrate the Pulsar clock and reg?

Thanks
Do
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Old 9th October 2014, 04:16 PM   #20
Pulsar Clock is offline Pulsar Clock  Europe
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clsidxxl,
I start from the end, I used with a little bit of fantasy the expression "fixed implementation" to indicate a normal DAC built to perform at home and not to be quickly easily and continuously modified like the configuration that we presented and that we use for test moving among various audio systems sometimes located in cities well far one from another.
Your DAC is what I ment when I wrote "fixed implementation"; I saw in your post #3205 on Ian's FIFO thread the pictures that you published in March and I am really impressed seeing how you modified the Audio GD Ref 7.1 keeping the R-2R converters and changing all the input digital section, a very clean implementation. In that pictures didn't appear yet the Cubietruck, for sure a younger and very valuable substitute of the R-PI.
About your question on the UFL connectors: in the synchronization path from the FIFO to the DualXO you have to consider that the DualXO board doesn't have any UFL connector on the input side making hard the usage of coaxial cables even if you did it on your DualXO where it was motivated by the long lines and the need to preserve the already de-jittered signal.
The key point is to keep under control possible transmission errors induced by the jitter up to the DualXO board where the de-jitter is performed. Consider that the UFL connectors are designed to feed 50ohm lines while digital connections on our boards are not at all impedance matched lines and the cables provided by Ian for sure doesn't induce more jitter than a UFL connection on a such short path.
The most critical data transfer is from DualXO output, where the signal performs its lowest jitter, to the DAC board input and here short coaxial cables on UFL connectors are for sure the best approach.
Your last question: the Raspberry PI power supply is fed via the USB connector by means of a TPS7A4700EVM evaluation board that is partially hidden by the R-PI in the system overview picture.
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