What is the filter circuit and it's funtion?

Question

What is the filter circuit and it's funtion?

Answer 1

A filter is used to filter out electrical noise (from induction etc).. It basically consists of a resistor and capacitor which takes out the spikes etc that occur and with a low the capacitor will take the load and keep the voltage static.. and if there is a voltage spike the resistors will dissipate that voltage..

Answer 2

In electronics, a filter circuit (and there are many different designs) is a circuit that passes some frequencies and rejects (does not pass) others.

Low Pass: passes all frequencies below a set point and rejects those above.

High Pass: passes all frequencies above a set point and rejects those below.

Band Pass: passes all frequencies in a set "band" and rejects those above or below that band.

Band Reject: rejects all frequencies in a set "band" and passes those above or below that band.

Low pass filter can be a simple parallel capacitor.

High pass can be a simple series capacitor.

Band pass can be a parallel capacitor and inductor.

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