Mikael Lavoie
- Jan 4, 2015
- 18
- Joined
- Jan 4, 2015
- Messages
- 18
Hi,
I have a noise problem on a project that i work on that need to be adressed. I want make a noise filter (pi filter) to eliminate, or greatly attenuate the 350 khz ac that i got from my +5vdc power bloc that power my project. See the scope trace if you wanna see by yourself.
The problem is that this ac get in my oscillator circuit and make it unstable.
So i found numerous site about pi filter and how to make them. But i'm not sure about the maths there. Also i alreayd put a electrolytic caps to help filter out the low noise. I dont know if it will intefere with the filter if i place it after the caps already there.
I found this site http://www.calculatoredge.com/electronics/ch pi low pass.htm to help me calculate the value i need. So i've done the calculation for a 300 khz cutoff and it gave me the value : C1-C2 = 6.675941nF and L1 = 25.73782uH .
Can somebody confirm that i can use those values to make my filter and eliminate my problem???
Thx,
Mikael
I have a noise problem on a project that i work on that need to be adressed. I want make a noise filter (pi filter) to eliminate, or greatly attenuate the 350 khz ac that i got from my +5vdc power bloc that power my project. See the scope trace if you wanna see by yourself.
The problem is that this ac get in my oscillator circuit and make it unstable.
So i found numerous site about pi filter and how to make them. But i'm not sure about the maths there. Also i alreayd put a electrolytic caps to help filter out the low noise. I dont know if it will intefere with the filter if i place it after the caps already there.
I found this site http://www.calculatoredge.com/electronics/ch pi low pass.htm to help me calculate the value i need. So i've done the calculation for a 300 khz cutoff and it gave me the value : C1-C2 = 6.675941nF and L1 = 25.73782uH .
Can somebody confirm that i can use those values to make my filter and eliminate my problem???
Thx,
Mikael