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Old 19th October 2010, 10:41 PM   #1
noyan is offline noyan  Turkey
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Default How to build a 4.2336 MHz TCXO clock?

I have bought a Philips cd104 cd player. It's chrystal frequency is 4.2336 MHz. I want to install a clock but, 4.2336 MHz TCXO is not available. How can i provide this frequency by using (for example) a 16.9344mhz TXCO and a divider circuit?
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Old 19th October 2010, 11:08 PM   #2
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You don't need a TCXO. The temperature variation in the room isn't enough to make an audible difference in the operation of the unit.

So any oscillator will work. Yes you can divide a higher frequency but it's a lot of trouble. Why do you want to do all this? If the original oscillator is working, leave it alone.

And you can special order any frequency you like if you are willing to pay the setup charge.
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Old 19th October 2010, 11:20 PM   #3
noyan is offline noyan  Turkey
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Quote:
Originally Posted by bob91343 View Post
You don't need a TCXO. The temperature variation in the room isn't enough to make an audible difference in the operation of the unit.

So any oscillator will work. Yes you can divide a higher frequency but it's a lot of trouble. Why do you want to do all this? If the original oscillator is working, leave it alone.

And you can special order any frequency you like if you are willing to pay the setup charge.
Thanks for the answer!
I changed the 11.2896mhz crystal with TCXO clock unit in my Marantz CD80 and i have very pleasured the difference. That's why i intended to do the same way in CD104.
Noyan
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Old 20th October 2010, 12:32 AM   #4
amc184 is offline amc184  New Zealand
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Quote:
Why do you want to do all this? If the original oscillator is working, leave it alone.
To reduce jitter and power supply contamination. If you use one of the common TCXO kits on eBay, which is likely what noyan has done, you'll get a substantial improvement in sound quality. They're not the best way to go for a low jitter clock, but they are effective, and they're good value for money.

Noyan, there are two solutions to your problem:

- Buy a TCXO kit off eBay that includes a divider. This one here will do the job, use its MCK/4 output.
- Build something like a Kwak clock with the original crystal out of the player. It might cost more, and it requires more effort, but the results will be better than the first option.
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Old 20th October 2010, 05:58 AM   #5
noyan is offline noyan  Turkey
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Quote:
Originally Posted by amc184 View Post
To reduce jitter and power supply contamination. If you use one of the common TCXO kits on eBay, which is likely what noyan has done, you'll get a substantial improvement in sound quality. They're not the best way to go for a low jitter clock, but they are effective, and they're good value for money.

Noyan, there are two solutions to your problem:

- Buy a TCXO kit off eBay that includes a divider. This one here will do the job, use its MCK/4 output.
- Build something like a Kwak clock with the original crystal out of the player. It might cost more, and it requires more effort, but the results will be better than the first option.
Thank you!
My CD80 clock mod is here: Marantz CD80 clock installation

Yes, i saw this clock unit in ebay Actually i want to build my clock myself like in Marantz CD80. Therefore, i need a schematic of simple frequency divider. If i can not, i will buy.
Noyan
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Old 20th October 2010, 06:31 AM   #6
amc184 is offline amc184  New Zealand
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This site here shows some example divider circuits. You'll want to use two divide-by-two configured flip-flops in series.

That said, if you're keen to build it yourself (and you seem to be), build a Kwak clock instead. You'll get a far better result than with a TCXO with a divider.
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Old 20th October 2010, 06:49 AM   #7
noyan is offline noyan  Turkey
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Kwak circuit is better i believe but, a little bit complex for me. Now, i am picking the info about it.
Thank you again for your kind help!
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Old 20th October 2010, 09:47 AM   #8
noyan is offline noyan  Turkey
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I decided to build Kwak clock. It is not complex at all
Noyan
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Old 20th October 2010, 09:49 AM   #9
amc184 is offline amc184  New Zealand
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Good choice. You can use the player's original crystal as well, so you're set in that respect as well.
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Old 20th October 2010, 12:43 PM   #10
noyan is offline noyan  Turkey
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Bad news!: ''The KWAK-CLOCK will work with any crystal in the range 8 to 24.576 MHz''. It means 4.2336 MHz is not possible.
Meanwhile, i found another clock here: Introduction to Fundamental Crystal Oscillators
Noyan
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