what kind of capacitors is connected to the CD player's crystal? - diyAudio
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Old 3rd May 2002, 03:05 PM   #1
jarthel is offline jarthel  Australia
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Default what kind of capacitors is connected to the CD player's crystal?

as title. Thank you.

jayel
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Old 3rd May 2002, 03:58 PM   #2
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Do you mean what type or why?

Type: probely ceramic of some sort, NP0 maybe

Why: To create suitable load in order to get stable oscillations

Value: (>5)15-33 pF is normal values

If you change the value you can tune the frequency but you get a worse ocsillator. It's wise to tune as little as possible.
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Old 3rd May 2002, 04:36 PM   #3
jarthel is offline jarthel  Australia
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I had a looked in Farnell's catalog.

I don't see NPO ceramics. I can only see ceramic multilayer/disc & palte.

I also had a look at RS online catalog and they don't have NPO ceramic.

Can you please clarify? Thank you.

Jayel
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Old 3rd May 2002, 05:23 PM   #4
tiroth is offline tiroth  United States
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NP0 (or C0G) is the dielectric, not the physical makup (multilayer/monolithic, etc)

If it is Z5U/X7R/etc it isn't NP0.
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Old 3rd May 2002, 06:23 PM   #5
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May I ask why you wonder about these caps?
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Old 3rd May 2002, 07:03 PM   #6
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Quote:
Originally posted by jarthel
I had a looked in Farnell's catalog.

I don't see NPO ceramics. I can only see ceramic multilayer/disc & palte.

I also had a look at RS online catalog and they don't have NPO ceramic.

Can you please clarify? Thank you.

Jayel
---------------------------------------------------

Look again at Farnell hard copy. They have moulded ones but are expensive. They also have cheaper dipped ones and COGs
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Old 5th May 2002, 02:38 PM   #7
jarthel is offline jarthel  Australia
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Quote:
Originally posted by peranders
May I ask why you wonder about these caps?
Cause I think I might have broke these caps during modding. :-)
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Old 5th May 2002, 04:51 PM   #8
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Default If you need to in a pinch

you can always take two insulated wires, twist together (like a twisted pair) - one inch or less - connect in parallel across the crystal, and make a capacitor for the crystal oscillator. I used to do this to "tweak" the frequency of a crystal by changing the capacitance.
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Old 5th May 2002, 04:53 PM   #9
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That's only good for a few pF. The values he will need a are more likely in the 10-30 pF range.

Jocko
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Old 5th May 2002, 05:50 PM   #10
sonnya is offline sonnya  Denmark
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Do not change it to X7R, Y5U or anything else than COG or NPO. Anything else to unstable regarding capacitance versus temperature.

Go for the the Values specified by Jocko or PerAnders.

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