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Old 3rd November 2003, 07:37 AM   #11
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Cool Re: Clock to choose

Quote:
Originally posted by Jesús Puerto

www.isotemp.com

Jesús
Hello Jesús,
The link you gave was to ovenized crystal oscillators. These are extremely expensive.
I don't think this degree of frequency precision is necessary in a CD-player.
What matters is how the oscillation is generated.
A FET Colpitts oscillator seems to be the best. A bipolar transistor Colpitts is also used by Lcaudio.
Powersupply plays a minor role, but does influence the result.

Off topic, did you receive my email regarding the Audionote 2 schematic?
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Old 3rd November 2003, 08:10 AM   #12
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The clock itself should be very low jitter. In my experience there are few good clocks around.

In addition, the power supply should be low noise. Most comercially available clocks fail here, in my experience.

-----------------------------------------------------------------
For a given XO, the PS noise is very important and bringing this down to 5nV/sqrtHz or less brings much benefit in reducing the 'Hifi Sound' often said of replacement clocks to a much more 'relaxed' musical presentation of music.

I am told by a manufacturer of XOs that the chips inside are pretty industry standard and it seems desirable to 'clone' the XO with better compenets.

What do you think?
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Old 3rd November 2003, 05:52 PM   #13
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Quote:
Originally posted by fmak


-----------------------------------------------------------------
For a given XO, the PS noise is very important and bringing this down to 5nV/sqrtHz or less brings much benefit in reducing the 'Hifi Sound' often said of replacement clocks to a much more 'relaxed' musical presentation of music.

I am told by a manufacturer of XOs that the chips inside are pretty industry standard and it seems desirable to 'clone' the XO with better compenets.

What do you think?
Hi

The majority of clocks is made of standard chips. Better chips are available, believe me.

Been there and done nearly all......

regards
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Old 3rd November 2003, 06:00 PM   #14
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Default Re: Re: Clock to choose

Quote:
Originally posted by Audiofanatic
Hi Raja,

The Kwak Clock turnout to be the best one for me.
It's cheap it's a DIY one and Elso is a real gentilman!
The Tent Clock is also good, but to bad it's no DIY Clock.
The Tent clock works as good as the Kwak Clock, no doubt about that.

So If you ask me,............... I would go for the cheapest and DIY one (sorry Guido, but if you had a DIY one, than the choice would be between yours and Elso's. The LC XO3 is a copy of the KC-7, more or less. If some one knows more about theLC Clock, let me know.


Best regards,

Audiofanatic

Hi

1 - I have a DIY version available (canned module only)
2 - Elso, does Lars pay you for your design efforts ?
3 - (slightly) depending on the concept, but power supply noise counts !


enjoy
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Old 3rd November 2003, 06:04 PM   #15
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Default Re: Clock and more Clock

Quote:
Originally posted by Jesús Puerto
Hola Jose and Guido,

Whay not is possible.
Check temextime.com
and Ecliptek Corporation

Check me your opinion José.

Jesús
Hola !

If these suppliers can give me a jitter spec (in ps, please let them specify sigma range and rms or pp values) I might start being interested.

hasta pronto
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Old 3rd November 2003, 08:36 PM   #16
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Post Re: Clock and more Clock

Quote:
Originally posted by Jesús Puerto
Hola Jose and Guido,

Whay not is possible.
Check temextime.com
and Ecliptek Corporation

Check me your opinion José.

Jesús
Hi Jesús,
I checked most of this list:
http://www.sherlab.com/electronics/quartz.htm
See also:
http://db.audioasylum.com/cgi/m.pl?f...clock&session=
Do I need to say more?
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Old 8th November 2003, 09:11 AM   #17
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Guido,

Which manufacters of XOs do you recommend? Maybe Valpeyfisher, MF Oscillators, Fox Electronics? The jitter caracteristics of Valpeyfisher XOs are excellent, I would say (<1ps). Is there any real benefit of using discrete oscillators instead of this canned oscillator.

Best regards
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Old 8th November 2003, 09:59 AM   #18
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Thumbs up Valpey Fisher

Quote:
Originally posted by Rookie
Guido,

Which manufacters of XOs do you recommend? Maybe Valpeyfisher, MF Oscillators, Fox Electronics? The jitter caracteristics of Valpeyfisher XOs are excellent, I would say (<1ps). Is there any real benefit of using discrete oscillators instead of this canned oscillator.

Best regards
Hi Rookie,
Try to order one or two from Valpeyfisher.
If you have any luck I may want one too (11.2896 MHz) just for fun.
BTW Guido's clock ia a canned oscillator from a unknown manufacturer.
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Old 8th November 2003, 10:25 AM   #19
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Default Which clock to choose

Hi Gudio and Elso,
With the Isotemp oven and the crystal
of Aselcom I´m not doing proves, but I have friend that they were doing proves
and they told me that the sound was superior at another oscilators.
The Aselcom is cut for working at 78ºC with 0.5ppm.
You can see in the Isotemp web that the
offset inn ppm with 78ºc is minimal, for these reason I was choosing these system, and I think that if you put the crystal working at 78ºC the effects of the enviorement don´t affect at the frecuency, jjiter and etc.
I don´t have the sigma range and rms or pp values but i´ll try to get its for you.
My friend and I´ll try to buy the EB71F5
series of ECLIPTEK to compare with the Isotemp system, I´ll ask at the ECLIPTEK
about the sigma range and rms or pp values.
If I´ll receive the oscilator I don´t have
any problems for senr st you the Oscilator also you can to do the checks.

Elso you have right the ovenized crystals oscilators are very expemsives, but I like to compare differents technologies, and you giive your email becouse I didn´t reveive you email about the DAC Audionote 2.

Elso and Guido I think that LC AUDIO use ths Aselcom crystal is tue.

Jesús
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Old 8th November 2003, 10:42 AM   #20
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Smile Re: Which clock to choose

Quote:
Originally posted by Jesús Puerto
Hi Gudio and Elso,

Elso and Guido I think that LC AUDIO use ths Aselcom crystal is tue.

Jesús

Hi Jesús,
I am curious about the OCXO.
Lcaudio is using Hy-Q crystals. Hy-Q a firm so polite I have ever seen , as they never replied to any email I have sent them.
Looking forward to the Audionote schematic. Thanks in advance.
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