# Resistor and Capacitor value for Low-Pass Filter

#### DamarJati

Joined May 7, 2018
3
excuse me...
what's the effect of resistor and capacitor value on low-pass filter?
and how i use that for my amplifier project?

#### dl324

Joined Mar 30, 2015
14,686
Welcome to AAC!

An important parameter for a low pass filter is the frequency at which the power has been reduced by half.

Is this homework?

#### BR-549

Joined Sep 22, 2013
4,928
The value of resistance and capacitance sets the value of "low"....in "low pass filter". It implies that value and lower.....will pass.

#### DamarJati

Joined May 7, 2018
3
Welcome to AAC!

An important parameter for a low pass filter is the frequency at which the power has been reduced by half.

Is this homework?
Yeah, literally it's my homework...

#### DamarJati

Joined May 7, 2018
3
The value of resistance and capacitance sets the value of "low"....in "low pass filter". It implies that value and lower.....will pass.
So...
that's mean if i using lower value of capacitor and resistor, the lower audio frequency that will pass?

#### BR-549

Joined Sep 22, 2013
4,928
It's not the individual values of R and C. It's the ratio of R and C.

We can control current in two ways.
1. The amount of current is controlled by resistance.
2. We can also control how fast the current changes. Like for a current to go from 0 to 10 amps. That transition can take different speeds or times, to get up to 10 amps. Some signals can go from 0 to 10 amps in 1 second. Other signals can do it in 1 millionth of a second.....a million times faster.

A filter can select what speeds(rates of change) go thru.....and what speeds are blocked. It's a speed limit on the CHANGE of current.

Does that make any sense?

#### dl324

Joined Mar 30, 2015
14,686
Yeah, literally it's my homework...