NPO/COG Ceramic

[NanoFarad]

the question is about 221k ceramic. i want to use them for audio signal purpose. are they suitable for audio? i heard that Z5U, X7R & Y5V type are bad for audio signal job.

 

[MarcelvdG]

These look like single-layer capacitors, and 220 pF single-layer capacitors can be anything from NP0 to X7R. Most manufacturers marked class-1 capacitors with a stripe that indicated the temperature coefficient, black for NP0 capacitors, so I would guess that these are class-2, probably X7R. A 10 % tolerance (tolerance code K) is also more common for X7R than for NP0.

If you want to be absolutely sure, you either have to find a datasheet for this exact model or to measure its capacitance versus temperature.

 

[NanoFarad]

thanks for the info
i don't know if i can use this ceramic capacitor between non-inverting & inverting input.

 

[MarcelvdG]

That should work just fine. There is practically no signal voltage across the capacitor when you connect it like that and small variations of its value would hardly affect the transfer of the amplifier.

 

[NanoFarad]

 

[NanoFarad]

Hi...are these npo/cog? small but no black mark on top

 

[MarcelvdG]

Probably not, although I can't be sure about that, because some manufacturers don't use the black mark.

 

[NanoFarad]

alright thnks.

 

[Mark Whitney]

If you are going to install a 220pF capacitor between 9 and 10 then you should also instal the other stability parts, 50pF and 20kohms between 3 and 9. See figure 3 of the LM3886 datasheet.

 

[NanoFarad]

If you are going to install a 220pF capacitor between 9 and 10 then you should also instal the other stability parts, 50pF and 20kohms between 3 and 9. See figure 3 of the LM3886 datasheet.

Yes, i know Sir. i'll use 47pf(npo) & 22k metal film.
Unfortunately i do not have 220pf npo ceramic

 

[NanoFarad]

I have read almost every thread about lm3886 in this forum I read you(Mark w.), tomchr, Andrew T(Sad that he is no more) & many more people. Very informative conversations.