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Old 27th April 2005, 11:22 PM   #1
float is offline float  England
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Default Tent xo

Sorry if this seems like old ground, but a search didn't help me much. I am looking to improve the clock of my cd63 ki-s and was wondering if implementing the tentlabs xo was as straightforward as following the circuit diagram on their website( i.e. building the suggested power supply and using the xo crystal module).
Would this be a better mod than the trichord clock2 which is available for a reasonable sounding 50 quid? Can the xo module be used on its own to replace the standard crystal running off the existing supply?

Thanks in advance
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Old 28th April 2005, 01:55 AM   #2
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If I am not wrong.........the XO (by itself) costs on 29 Euros, which I am sure is a lot less than 50 quid. I would only use the existing supply as a pre-regulator, as in order to get the most out of any clock, it must be fed with a low noise supply.

Very low noise.

Other than that, yes, it is straightforward. I would not put its output into a filter chip, as that will degrade its performance. Rather, I would opt for a scheme that takes the output of the clock, and feed it (through build-out resistors) to all the places that need it. The DAC in an o/s set-up is the most critical.

Jocko
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Old 28th April 2005, 12:33 PM   #3
tubenut is offline tubenut  South Africa
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I have used clock 2 and it is good.... Trichord uses a far cruder PSU then the cct suggested by Guido. Trichord I think buffers their oscillator output and there are opposing views on the merits of it. If you are lazy and want to solder a few wires only, use the Trichord, if you are more macho, get an XO.... Real macho guys will tell you to build a Kwak Clock using the existing Xtal.

My guess is that the XO and Kwak are better then the Trichord clock 2 but will take more effort on your part.

Whatever you do, I would recommend a separate transformer and crude DC supply to drive whatever clock you use. Makes a big improvement on the Trichord ime.
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Old 28th April 2005, 12:49 PM   #4
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Quote:
Originally posted by tubenut
Real macho guys will tell you to build a Kwak Clock using the existing Xtal.
But real smart guys build clocko jocko bob pease style.
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Old 28th April 2005, 01:38 PM   #5
float is offline float  England
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I'm so lazy I cant be bothered to finish this sent.....

Seriously tho I am a bit of a novice, and I gather the kwak clock requires some knowledge and testing gear.
If I can build a power supply I can test it with my multimeter, but much beyond that and I could end up out of my depth. If opinion is that the tent xo kicks the trichord's butt then I think I would give it a go; I just want to have a clear idea of what I need to do.

My worry is that if I make something that doesn't work I may not have a clue how to fix it
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Old 28th April 2005, 02:25 PM   #6
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Quote:
Originally posted by float
I'm so lazy I cant be bothered to finish this sent.....

Seriously tho I am a bit of a novice, and I gather the kwak clock requires some knowledge and testing gear.
If I can build a power supply I can test it with my multimeter, but much beyond that and I could end up out of my depth. If opinion is that the tent xo kicks the trichord's butt then I think I would give it a go; I just want to have a clear idea of what I need to do.

My worry is that if I make something that doesn't work I may not have a clue how to fix it

For a start you'll need this,
http://www.alw.audio.dsl.pipex.com/D...ice_Manual.pdf

and something like this
http://www.net-audio.co.uk/clockfit.html

Put back four or so components and you are back where started should the clock mod fail to please.
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Old 28th April 2005, 03:20 PM   #7
float is offline float  England
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Thanks Rfbrw, thems good links
I've read that the ALW superregs are extremely good; could one of these power a tent xo and be about as good as it gets? It almost seems that the power supply for the clock is as important as the clock itself.
I'm just hoping good solutions can be simple
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Old 28th April 2005, 04:49 PM   #8
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Default Clocko Jocko...........rev #......?

Looks like this is one of the later versions that output a sine wave.

http://www.diyaudio.com/forums/showt...6884#post76884

Somewhere there is a version that outputs a square wave. R7 is lower.......C6 is removed (used to lower harmonic content...........not needed if you are making a square wave!), and it connects directly to Q3, without the bias divder. Output of Q3 can drive a 'HCU04 set up for a gain of 10.

Yes, ALW's reg would work nicely. Yes, the supply is just as important.

As for simple.........if you don't have to understand how it works, and why Q2 looks odd.........just build it. You can take the crystal of your CDP and use it. No need to buy a special one. (That was the main impetus of that design.)

There is also a link about a simple clock distribution scheme.........maybe I can find it and the later clock schematic.

Edit:

Found the link..........here it is

http://www.diyaudio.com/forums/showt...730#post275730

Jocko
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Old 28th April 2005, 04:58 PM   #9
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Quote:
Originally posted by float
Thanks Rfbrw, thems good links
I've read that the ALW superregs are extremely good; could one of these power a tent xo and be about as good as it gets? It almost seems that the power supply for the clock is as important as the clock itself.
I'm just hoping good solutions can be simple

After a certain point it probably becomes a matter personal preference. The ALW superreg does it for some , the Jung superreg for some and shunt regs for others.
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Old 28th April 2005, 10:49 PM   #10
float is offline float  England
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Thanks for the heads-up Jocko, but you are so far ahead of me in this game that you may as well be speaking chinese
I'm aware of my limits at the moment; I can populate a board or hardwire a little circuit on veroboard, but I cant make my own PCB's and to be honest most of those linked posts were well over my head.
However, the willingness to experiment is inspiring....I must make a decision and buy some bits......tomorrow
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