# Low pass filter

Discussion in 'Electronics Homework Help' started by Jantz, Jan 3, 2018.

1. ### Jantz

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Dec 29, 2017
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?

2. ### Harald KappModeratorModerator

11,305
2,588
Nov 17, 2011
At any frequency - with varying degrees of distortion. You do the math.

3. ### Audioguru

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Sep 24, 2016
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.

4. ### Jantz

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Dec 29, 2017
That's everything i had for the question. When its need to be divided by 5?

5. ### Audioguru

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Sep 24, 2016
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.

6. ### Jantz

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Dec 29, 2017
I see....And ya the cutoff frequency is 3.5khz sorry i didn't notice it...Thanks btw can i pm u?

7. ### Audioguru

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

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Dec 29, 2017
Okok