Electronic Design Software

how the value of capacitor is selected in electronic circuit, what value for what purpose, which location?

I could understand the different value of resisters used in electronic circuits but, could not understand how the value of capacitors are selected in different location of the circuits, what value of µf or pf or nf should be used in the circuit? how it is calculated or decided? Say by a company when they design an electronic circuit, how they decide the value to be used and in which place of the cuircuit. While studing a cuircuit i always hove a question, why they have used 47µ in this place, why not any other value, say 470µ or else.

Public Comments

1. It depends on the circuit you ar designing and again the part of the circuit. For example if it is a power supply smoothing capacitor it would be a large value in micro farrads. But if you want a capacitor for removing high frequency spikes, then it would need a small capacitor in pico or nano farrads. You have to work with the formulae for the part of the circuit you are dealing with, and there are loads of formulas.