HiWelcome to AAC!
A thread belongs to the OP (original poster). Trying to take over someone elses thread is called hijacking, which is not allowed at All About Circuits. I have therefore given you a thread of your very own.
In addition, you have practiced the arcane art of necromancy, the revival of a long dead thread. Likely the OP (Original Poster) has solved his problem in the years that has passed, or thrown it away, or something.
This was split from Will be low pass filter be good enough to remove switching supply noise
Thanks for reply. in fact, I'm trying to use a TLC272CP and it doesn't work. this is my problem. my MCU is working very well. I have used several types of ferrite bead but couldn't help me. another problem I have is that I don't have oscope.This kind of power always has the noise, it depends on how many mV you can accept?
A Ferrite bead may reduce some noise.
And here are some methods to help you.
Using Toroidal Coil and capacitor LC Filter for the surge and interference of uC 5V and GND.
I'd go a bit further than a ferrite bead - maybe up to a dozen turns of stout wire round some kind of core, you can get suitable cores from the mains in filter from some old set top box or PC PSU etc.Hi
Ok and thanks.
Thanks for reply. in fact, I'm trying to use a TLC272CP and it doesn't work. this is my problem. my MCU is working very well. I have used several types of ferrite bead but couldn't help me. another problem I have is that I don't have oscope.
You are talking about something like this inductor in this PSU:I'd go a bit further than a ferrite bead - maybe up to a dozen turns of stout wire round some kind of core, you can get suitable cores from the mains in filter from some old set top box or PC PSU etc.
A good starting point is the well known Pi filter, an input capacitor, an output capacitor and the inductor bridging the two. Low ESR electrolytics are recommended - and or add 0.1uF or so in parallel with both electrolytics.
The type of cores I meant would normally be to the right of the black & white wires along the top right edge above the heatsinks.The circuit in my first post and below didn't work.
You are talking about something like this inductor in this PSU:
I have removed it from the PSU. look at this photo:
From right to left: 1- the coil(inductor) that I have removed from PSU. it has 10 leg (5 at right and 5 at left).
2- The green core that I have used never so far.
3- Four type ferrite bead that I have used but couldn't solve this problem.
Now I have two choice. the green core or the yellow (10 leg). Which one is better for Pi filter? yellow? How to use it?
and about shunt capacitors, How to choose their amounts?
The toroid choke has several windings on it - one of those windings might be suitable.You are speaking about those three yellow choke? which one is better? Is one of those smaller enough?