what kind of capacitors is connected to the CD player's crystal?

jarthel · 3rd May 2002, 03:05 PM

as title. Thank you.

jayel

peranders · 3rd May 2002, 03:58 PM

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.

jarthel · 3rd May 2002, 04:36 PM

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

tiroth · 3rd May 2002, 05:23 PM

NP0 (or C0G) is the dielectric, not the physical makup (multilayer/monolithic, etc)

If it is Z5U/X7R/etc it isn't NP0.

peranders · 3rd May 2002, 06:23 PM

May I ask why you wonder about these caps?

fmak · 3rd May 2002, 07:03 PM

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

jarthel · 5th May 2002, 02:38 PM

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. :-)

jackinnj · 5th May 2002, 04:51 PM

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.

Jocko Homo · 5th May 2002, 04:53 PM

That's only good for a few pF. The values he will need a are more likely in the 10-30 pF range.

Jocko

sonnya · 5th May 2002, 05:50 PM

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.

Sonny

3rd May 2002, 03:05 PM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	what kind of capacitors is connected to the CD player's crystal? as title. Thank you. jayel

3rd May 2002, 03:58 PM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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. __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

3rd May 2002, 06:23 PM	#5
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	May I ask why you wonder about these caps? __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

5th May 2002, 04:51 PM	#8
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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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3rd May 2002, 04:36 PM	#3
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	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

3rd May 2002, 05:23 PM	#4
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	NP0 (or C0G) is the dielectric, not the physical makup (multilayer/monolithic, etc) If it is Z5U/X7R/etc it isn't NP0.

5th May 2002, 04:53 PM	#9
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	That's only good for a few pF. The values he will need a are more likely in the 10-30 pF range. Jocko

5th May 2002, 05:50 PM	#10
sonnya diyAudio Member Join Date: Oct 2001 Location: Denmark	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. Sonny

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