Which type of capacitor should I use?

[DanSteely]

Hi All,

I’ve been assembling some small amplifier circuits based upon the TBA820M and as a starting point have used the test circuits in the ST datasheet. My question is regarding the capacitors in the circuits and am unclear on the difference of the non polarised capacitors.

With that regard which type of capacitors should be used in these type of circuits? E.g. can a 0.22uF can be a metalized polyester, a ceramic, a tantalum or even a non polarized electrolytic?

I am building up a stock of components including capacitors and am fine with electrolytics but it’s the other types i’m confused about. I seem to have quite a few ceramics & less metalized polyester but that’s about it.

When not stated on circuit diagram how do know what flavour of non electrolytics to use?

Another question: Why are polystyrene capacitors significantly more expensive than other sorts, what are they required for and do I need to add some to my stock?

Any thoughts and comments would be most welcome.

Thanks

 

[ticknpop]

At 0.22 uf and no explanation of where in the circuit it is ( or schematic) your best to use Panasonic, Wima, or Epcos polypropelene.

Polystryrene are great , but limited to .01uf and less unless you buy Relcap or Multicap ( great but expensive and large).

Read this young Jedi and all will be clear

http://www.reliablecapacitors.com/pickcap.htm

 

[nigelwright7557]

I use a lot of polyester caps.
You can get a polyester 220nf 0.22uf capacitor ok.

 

[DF96]

A good starting place is:
- large values: use normal polar electrolytic
- mid values: use polyester film cap, unless for a filter in which case use polypropylene
- small values: use NP0/C0G ceramic or polystyrene

In almost all cases, getting the right circuit is more important than choosing the 'right' component.

 

[DanSteely]

Hi Guys, Many thanks for your information and help.