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Old 5th December 2003, 07:21 PM   #11
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Yes .. 4 times
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Old 5th December 2003, 07:24 PM   #12
Bricolo is offline Bricolo  France
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I can have micas, but a pack of 5 for 15, so 30 for only 2 caps I'll use

I'll stay with the ceramic


BTW, thanks for the advices
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Old 5th December 2003, 09:29 PM   #13
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Default Just one problem.......

He never mentioned what frequency it operates at. Kinda hard to give the right advice without knowing that.

But what do I know?

Jocko
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Old 5th December 2003, 09:37 PM   #14
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Jocko: Doesn't really matter, as long as the xtal has a defined serial capacitance (typically 15 - 30 pF) the frequency of the xtal does not influence the values these two capacitors should have.

And if they are 68 and 39 pF defined by ELSO KWAK i will trust this to be the right values for his version of a Collpitts oscillator.


Have a nice day ..
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Old 6th December 2003, 02:34 AM   #15
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Yes, it does matter.

The ratio remains fixed, but the values change as a function of frequency.

Also, it is not spec'ed as whether or not resonance is measured with a series or parallel load. Probably parallel, since most CDPs are that scheme.

But if it is 16 MHz......the load is most likely 20 pF, not 32 pF.

Jocko
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Old 6th December 2003, 04:34 AM   #16
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Default Re: Just one problem.......

Quote:
Originally posted by Jocko Homo
He never mentioned what frequency it operates at. Kinda hard to give the right advice without knowing that.

But what do I know?

Jocko

The frequency is 16.9344 Mhz.

Quote:
Originally posted by Lars Clausen
Jocko: Doesn't really matter, as long as the xtal has a defined serial capacitance (typically 15 - 30 pF) the frequency of the xtal does not influence the values these two capacitors should have.

And if they are 68 and 39 pF defined by ELSO KWAK i will trust this to be the right values for his version of a Collpitts oscillator.


Have a nice day ..
If I can remember is the series capactance of the crystal is 30pF. Both 68 and 39 pF cap are silver mica.

The 0.01uF cap between R1 & R2 is a SMD ceramic cap.
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Old 6th December 2003, 02:18 PM   #17
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The capacitance value is related to the xtal's manufacturing specifications, not the frequency of the oscillator.
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Old 6th December 2003, 02:21 PM   #18
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Overmind:
Looking at your schematic, it seems there are no resistors to drop the voltage from the 8V ragulator to the 5 and 5.9 V shunts. Are you relying on the series resistance of the chokes?

Did you check the voltages over the shunts, to make sure none of them are burnt?

Good luck ...
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Old 6th December 2003, 02:26 PM   #19
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I would feed the 431s with a constant current source, rather than with a voltage reg
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Old 6th December 2003, 03:09 PM   #20
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Quote:
Originally posted by Lars Clausen
The capacitance value is related to the xtal's manufacturing specifications, not the frequency of the oscillator.
I was informed Cs of the crystal is 30pF.


Quote:
Originally posted by Lars Clausen
Overmind:
Looking at your schematic, it seems there are no resistors to drop the voltage from the 8V ragulator to the 5 and 5.9 V shunts. Are you relying on the series resistance of the chokes?

Did you check the voltages over the shunts, to make sure none of them are burnt?

Good luck ...
I am using the DCR of the inductor to drop the voltage from 8 to 5 and 5.9V. I did not measure the voltage across the inductor. However I am able to measure 5 and 5.9V at the cathode of the LM431s. I think this is ok.

The KC was working till I added in the 5.9V regulator for the AD8561 and change a few resistors.

Thanks
SW
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