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Why do we use two 33pF ceramic capacitors for crystal in microcontroller?

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The two legs of the crystal is to be connected to the capacitor and other end of the capacitor is to be negative then the crystal line should go to the microcontroller

Posted on Mar 17, 2011

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Where can I find a 5 picofarad 3000 volt ceramic disc capacitor?


Hi,
this is where I go for odd and unusual capacitors, massive range:
Ceramic Single Layer Capacitors

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Bn9603736a power , CERAMIC CAPS ..NEED PART NUMBER


It's not a ceramic capacitor. It's an MOV, [Metal Oxide Veristor]. A protection device. If the set has no other faults, even without this MOV, it should turn ON. If not, contact any service technician. google.com/+GopakumarGopalan

Nov 21, 2013 | Samsung Televison & Video

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I had a HP dv7-4165dx laptop that does not turn on I replaced the power socket because it wasn't working. And the power switch because I thought that was wrong with it. But still it does not turn on....


With these replaced;

1) http://www.amazon.com/Genuine-Harness-Pavilion-DV7-4000-Series/dp/B008LDTVJ4/ref=sr_1_9?ie=UTF8&qid=1350516570&sr=8-9&keywords=dv7-4165dx

2) http://www.amazon.com/Hp-Power-Button-Board/dp/B0045719EK

,and the AC adapter producing 19 Volts, with no fluctuation on the multimeter, when you wiggle the power cord TO AC adapter, and cable from AC adapter to DC Power Jack;

The problem is Power MOSFETs in the motherboard power section, and/or ceramic capacitors.
(MLCC ceramic capacitors)

Showing average price of Power MOSFET used in this type of application, and using a Fairchild Semiconductor - FDS6679 -
for an example,

http://www.mouser.com/Search/Refine.aspx?Keyword=FDS6679


Scroll down. 1 each = $1.01

Average price of MLCC SMD ceramic capacitor,

http://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-b2cj?P=1z0wrk9Z1z0t6fg


http://www.youtube.com/watch?v=3NN7UGWYmBY


http://www.youtube.com/watch?v=f_yFDpSTfao

http://www.youtube.com/watch?v=MqivHi7Qjvk


For additional questions please post in a Comment.

Regards,
joecoolvette


Oct 17, 2012 | Computers & Internet

1 Answer

Toshiba satellite c655d motherboard componet x4701 blown


There are no fuses on the motherboard.

The X4701 may be a Macom RF Power MOSFET, and will probably be located close to the X4701 designation, silkscreened on the motherboard.
Doesn't EVEN look like a fuse.

This is a general example of a Power MOSFET,

https://docs.google.com/viewer?a=v&q=cache:oER5NNz8cwcJ:www.fairchildsemi.com/ds/FD/FDS6675BZ.pdf+Fairchild+FDS6675BZ&hl=en&pid=bl&srcid=ADGEEShOhWPjm_M-ROHme4iEMrztCTOd-28jNiy1hVLQQh_VOyv8zcXEVDB_iTQA6MuZO88UmRkDgjyW9j4CP2aIJ-4DS-h6JNM3lvxldeApQeecmz_DADCw1s7tmNLxfPknqX14SZP6&sig=AHIEtbS_rYUAeo_8rB9YHkW05ZjLqeH4Jg

Notice the J-leads on the sides.

I wonder if you are looking at a crystal diode, or an MLCC ceramic capacitor, (Multi Layer Ceramic Capacitor, and is SMD. Surface Mount Device)

http://www.magnaquartz.com/wp-content/uploads/2011/05/crystal-diode.jpg

http://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-b2cj?P=1z0wrkiZ1z0t6fg

(Scroll down)

At any rate let's look at a Satellite C655D series of Notebook PC's motherboard,

http://www.ebay.com/itm/Toshiba-Satellite-C655-Intel-Motherboard-V000225020-1310A2355302-/251167301769?pt=Motherboards&hash=item3a7abce089

Under the large main views are small views.
The view to the far left is the Bottom side.
The third view from the Left is the Top side.

You have to click on each one, one at a time, then you can use the Zoom In feature for that view.
Using the Zoom feature, can you try to point out the electronic component?

Use a reference point we can both follow. State a known large component near it, and go from there.

You know what the processor socket, and graphics chipset is. They are covered by the Cooling Tube.
You know what Power MOSFETs look like now, and Ceramic Capacitors.
The small aluminum 'can's that have a purple mark on one side, are solid Polymer capacitors. (Doubt they are Tantalum)

Also, I realize that it gives one a sense of pride to repair a motherboard, and the cost of the electronic components are MUCH cheaper than buying a replacement motherboard, but a replacement may be the way to go.

(Fairchild Semiconductor International - FDS6679 - Power MOSFET is around $1.
Ceramic capacitors, (MLCC, and SMD), are around 60 to 82 cents.
From the Ebay link it looks like $39 to replace the motherboard)

Capacitor failure? Ehh. No problem if we're talking SMD MLCC ceramic capacitors.

Diode goes bad? Could led to power going to the wrong place, and other electronic components could have been affected.
Could be bad, or about to go bad.
Jus sayin'.

This would mean motherboard replacement is the more logical solution, IMHO.
Post back in a Comment.

Regards,
joecoolvette

Oct 16, 2012 | Toshiba Satellite Computers & Internet

1 Answer

How do you test a 1kvolt ceramic capacitor?


Hi Mixers,
You can test a 1kvolt ceramic capacitor;
a) using a capacimetre; replacing with other one of the same type; connecting it in a 12V oscillator circuit with a LED as output wich shall blink in a frequency determined by the capacitance, says, fast with low capacitance and slow with high capacitance. Normally ceramic HV capacitors are of small capacitance for use in high switching circuits or as a protection of a power switching transistors in modern power supplies

Feb 13, 2012 | Food Mixers

1 Answer

Where can i obtain a realistic 32-1200 manual for free? or what does cera and mag on the back of the mixer mean?


In reference to the question -
" what does cera and mag on the back of the mixer mean? "
these jacks are for the input of phonograph record cartridge signals.
Phonograph cartridges are of two types -
1. "Cera"mic (ceramic) cartridges generate their signal using a ceramic crystal which provides almost 1/2 a volt of current.
2. "Mag"netic (magnetic) cartridges generate a more accurate signal than a ceramic cartridge but the magnetic cartridge generates its signal using a moving-magnet mechanism (rather than a ceramic crystal) and the magnetic cartridge generates much less current than a ceramic cartridge, so its signal needs a lot more amplification than a ceramic crystal's output. So the two jacks on the back of the mixer provide different levels of amplification for the phono cartridges, less amplification for a ceramic cartridge and more amplification for a magnetic cartridge.
Since few people play phonograph records any more it is understandable that the public has little knowledge of the differences between ceramic and magnetic cartridges. But each have their own benefits and usually ceramic cartridges are cheaper than magnetic cartridges simply because it takes a lot more sophisticated manufacturing technology to make a magnetic cartridge, though magnetics are usually preferred over ceramics because of their more accurate generation of a signal from the wiggling groove in a phonograph record. But for those who can hear, the complete sound signal from a phonograph record is much preferred over the dead and dry sampled sound from a digital CD. And the old 1/4" reel-to-reel tape recordings are the highest sound quality of all because they are direct copies of the original magnetic tape masters with no digitizing at all. The fullness of their sound is astounding compared to any digitized signal..
A mag input is down at the mic level.
A ceramic input is almost up at the line level.

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1 Answer

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lift one side if the crystal and place a ceramic capacitor around 22pf should work

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Ive been through this. Although it certainly appears to be a ceramic capacitor, its actually called a polyswitch. .65 amp. Parts express carries them. Part no. 071-256.

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2 Answers

Oscillating crystal


Solution: Replace crystal 1H00 with a new type, part number 823827736071.
Replace capacitors 2H08 and 2H09 with 4.7pF capacitors, part number 223886975478. See the attached photos for locations of the crystal and capacitors.

sorry the photos I have are in a PDF format and not supported here if you want send me an email and I could send the file

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