🚀 go-pugleaf

Could anyone explain when to use what kind of capacitor?
Do you have any tumb-rules? I thought the choice was
easy for electrolytic caps, use tantalium for low noice. 
But from an article in february 1992 in elector electronics:

	"..tantalium capacitors are not really suitable for
	processing audio signals..."

If I was to build a low noice microphone preamp:

	What kind of ~470uF cap to use in series with the 
	200/600 ohm microphone?

	What kind do I use for ~100uF decoupling in the 
	first and second stage?

	What 33pF to use between base collector?

	Where in a typical circuit does it matter if the cap
	is low distorsion and low noice. Decoupling caps relly
	kill all AC over ~20 Hz so does it matter there?

	What type of cap to use for AC connecting different
	amplifer stages? If I can choose a bipolar over a
	electrolytic (because value is both ranges) is it better?

	Is a electrolytic cap with low current leakage always
	better than one with higher leakage?

	What types of cap to use in an ordinary tone control?

	Is noice performance improved if I put a small polyester 
	cap in parallel with a large electrolytic cap. I assume
	most noice is above say 1 KHz.

	What cap to use in power circuits after a 7812 voltage
	regulator? Will the wrong type give noice or hum in 
	the preamplifer?

	Is there something else to think about if I use SMD caps?

A lot of questions but I hope you will give me some of the answers.

Thanks!

/kgb
--
Kent Boortz
boortz@sics.se