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I have never used and never seen polycarbonate or silver mica capacitors.
Ceramic capacitors have wide tolerance and change value with temperature and voltage changes. Not good.
Metalized plastic film capacitors are available everywhere with 5% tolerance and do not change value. Very good. They do not cost much.
I used "polyester" capacitors 45 years ago and they were different from today's metalized plastic film ones.
For best capacitance stability use a film capacitor with a stable film material such as polycarbonate.
Hi,
Check out Silver Mica capacitors.
How come you've never seen Silver Mica capacitors?, they are very high quality capacitors frequently used in oscillator and RF circuits.
They have good tolerences and excellent stability.
Your filter attachment does not work.
So I can use them for the such a speech filter right? Are you thinking that using MKT caps is the best choice or at least good enough choice for the said filter, or there is another better kind type cap for that job??The MKT capacitors you showed are a very stable metallized plastic film type. Use a tolerance of 2% or 5%.
"Multi-layer" capacitors are ceramic and are not stable. They are good as a power supply high frequency filter.
Your attachment "is not available" (in its properties) and therefore it does not open.
It is supposed to be a thumbnail that gets larger when clicked on.