I used a cheap cheap clock

[davidsrsb]

At low currents like this a pi filter C-R-C on the rectifier and single stage of regulation may be better. R could be ~100R so the input to the reg will be nearly pure dc with just a small amount of 100Hz and low harmonics.

[Sunsun22]

Sorry, do not quite understand. Can you draw a diagram on the supply? Thank you

[fmak]

Originally posted by Sunsun22
Thank you for all the input. The measurement was made without loading. I will measure it when it is in operations. Yet, I still wonder should I install a more expensive clock in an attempt to even improve better?

----------------------------------------------------------------------------------
It is not the cost, but the phase noise. No point in using a very low TC clock with poor jitter performance!

The url you posted does not exist diyhifi.net . Can you please repost.


If the circuit posted is the one you have, the clock signal is not coupled direct but relocked.

[Sunsun22]

Sorry, it should be hifidiy.net

The circuit is the same for the kit that I bought. What is "relock"?

[Elso Kwak]

Originally posted by davidsrsb
At low currents like this a pi filter C-R-C on the rectifier and single stage of regulation may be better. R could be ~100R so the input to the reg will be nearly pure dc with just a small amount of 100Hz and low harmonics.

Right, CLC also works as in myclock, see also:
http://www3.sympatico.ca/add.automat...ice/ripple.htm

[Elso Kwak]

Now is this shiny square thingie a crystal or a crystal-oscillator????
[ I guess it is a complete crystal-oscilator as it is powered from 5V supply. So information given is plainly wrong]
74VHC04 oscillator is not much better than standard in CDP.
How many times I have to xplain this ppm spec which is useless. It is NOT a jitter spec but a frequency deviation; can you hear this???
DO YOU HEAR ME CHINESE FRIENDS?
Here a direct link to that cheap clock:
http://en.hifidiy.net/shop/views.asp?hw_id=52

PCB suspension seems to be directly stolen from Madrigal Audio Systems. Shall I give them a hint? One or two LM317 NOT low enough noise IMHO, especially as Vadjust pin is not bypassed. See link in post # 15.

[fmak]

Right, CLC also works as in myclock, see also:
http://www3.sympatico.ca/add.automat...ice/ripple.htm
[/B][/QUOTE]
-----------------------------------------------------------------------------------

When the Jung regulator has been improved so much (ALW version), there is to me NO reason for going so far to canacel out noise, and with a highish output impedance too. I have obtained easilly<10 uV/1MHz with the Jung circuit.

[Elso Kwak]

Right, CLC also works as in myclock, see also:
http://www3.sympatico.ca/add.automat...ice/ripple.htm

-----------------------------------------------------------------------------------

Originally posted by fmak
When the Jung regulator has been improved so much (ALW version), there is to me NO reason for going so far to canacel out noise, and with a highish output impedance too. I have obtained easilly<10 uV/1MHz with the Jung circuit.

Jung circuit not suitable for clock supply; been there done that.
You like to screw quoting systems fmak, jeeez!

[pwillard]

1) There are clearly better voltage regulator circuits than that. It seems to be more complex than it has to be and uses OLD regulator technology versus new. Have to wonder why...

2) The 4 pin CAN is clearly an a self contained crystal Oscillator which means it has "very stable consistent TTL level output" if it's not overloaded.

3) The 74VHC04 is clearly just a wave shaper and buffer, nothing more. It is not the Oscillator portion of the circuit at all. It may even be contributing to the overshoot. Nothing in this design shows me that they are trying to control spurious hi frequency oscillations.


4) Since this is a self contained crystal oscillator package... Load capacitance on the crystal is irrelivent... it's somewhere inside the "can".

I'm still laughing about the "cradle".

To each his own I guess.

[Elso Kwak]

Don't shake the craddle!