selection of capacitor

[Tanuj Singh]

Hey friends I’m always confused with the selection of which kind of capacitor of which value. So can anybody help me. Also how would i calculate the value of capacitor.

[Ashutosh Bhatt]

for which circuit you want value of capacitor?

active filter, 555 timer, delay circuit, 

the capacitor value can be found from the  design equation like for filter design

freq = 1 / 2*pi*R*C

if you have desired frequency, you just assume value of R (as 1 K, 10 K etc) and calculate value of C. thats all….

type of capacitor depends upon value of capacitor and voltage rating. it can be polarized (electrolytic) or non polarized (ciramic disc)

[Tanuj Singh]

In case of microcontroller, in order to provide a clock frequency of 12MHz we use a ceramic capacitor without any resistor why???

Also for RESET circuitry we use a electrolytic capacitor. Why ?

What is the reason behind the selection of these capacitors ?

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