# Low pass filter

#### Jantz

Dec 29, 2017
7
If i had a sawtooth function of 1KHz and peak amplitude of 10 volts, at what frequency will this signal pass through a low pass filter with 3.5kHz?

#### Harald Kapp

##### Moderator
Moderator
Nov 17, 2011
12,516
At any frequency - with varying degrees of distortion. You do the math.

#### Audioguru

Sep 24, 2016
3,639
You forgot to say any details about the lowpass filter. A simple single order RC? Then it cuts the harmonics gradually.
If its cutoff frequency is 3.5kHz then it noticeably cuts 3.5k/5= 700Hz and higher.

#### Jantz

Dec 29, 2017
7
You forgot to say any details about the lowpass filter. A simple single order RC? Then it cuts the harmonics gradually.
If its cutoff frequency is 3.5kHz then it noticeably cuts 3.5k/5= 700Hz and higher.
That's everything i had for the question. When its need to be divided by 5?

#### Audioguru

Sep 24, 2016
3,639
Look at a graph in Google of the frequency response of a simple single-order RC lowpass filter. It begins dropping at 1/5th of the -3dB cutoff frequency.

#### Jantz

Dec 29, 2017
7
Look at a graph in Google of the frequency response of a simple single-order RC lowpass filter. It begins dropping at 1/5th of the -3dB cutoff frequency.
I see....And ya the cutoff frequency is 3.5khz sorry i didn't notice it...Thanks btw can i pm u?

#### Audioguru

Sep 24, 2016
3,639
I do not want a PM, please ask questions in the forum so anybody can answer them.

#### Jantz

Dec 29, 2017
7
I do not want a PM, please ask questions in the forum so anybody can answer them.
Okok

Replies
2
Views
2K
Replies
15
Views
969
Replies
2
Views
848
Replies
3
Views
637