Why do you feel you need to 'filter off' RF?This is the first step of a filter for an Full Wave Rectified 50Hz AC that is on the process of being built, any tips?
So why bother simulating it from DC to daylight?... This is the first step of a filter for an Full Wave Rectified 50Hz AC that is on the process of being built, any tips?
Knowing how to use a simulator does not obviate the need to know when an ideal component is good enough vs knowing when to use a more complex model which accounts for parasitics and other non-ideal behaviors.Another excellent example of the difference between simulation and reality. Simulators use, "ideal" components. Be aware of this if you intend to build actual circuits with physical parts.
A 50 Hz power line has almost perfectly zero amplitude of frequency components in the MHz range, however, a large percentage of active voltage regulators will oscillate if not damped with a small ceramic capacitor which is effective in frequency ranges higher than a large aluminum electrolytic capacitor. In today's world, inductors are not cost effective in this position.So i should continue to think this is a perfect LPF and adapt to the material and components that i have? I didnt knew that electrolytics would fail when these frequencies were sensed. This is the first step of a filter for an Full Wave Rectified 50Hz AC that is on the process of being built, any tips?
That's cute!from DC to daylight?
"Alphabet soup' aside the filter should function well-nigh as predicted ELF through AF --- That said you are advised to consider the comments in posts #9 and #11Well, if i am not mistaken, this filter, if used as a CM will supress EM emission and interference right?
Thanks #12! I thought I was loosing my mind!Ai Chihuahua! You've been reading books, I suspect.
Those component values are nowhere near the right size for common mode filtering, you don't do CM filtering after the power transformer, a full wave rectifier doesn't cause that kind of interference, and thus, you don't need to do CM filtering unless your circuit is actually going to generate frequencies that must not be allowed to radiate from the power cord. You have not suggested anything which needs CM filtering. Please continue if there is some high frequency component generated in your project.
A low-power 1 KHz square wave won't produce significant EMI --- FWIW the principal purpose of a line filter is protection of connected equipment from line noise...Indeed, all i know of electronics has been learned in the past three weeks ahahaha. I had some practical experiencies but know i am trying to really learn theory and everything. The only thing my circuit has is 555 generating a square wave of 998 Hz at his output. I designed the circuit without any filtering like this one, it had only a beefy cap with a 7815, so lets say a nice ripple rejection. Then i started reading about the AC line filters and i thought it was needed to not radiate EM waves, but i feel like this post is making me realize it is an overkill and a confusion of concepts.
There are also legal requirements to suppress radiation created inside your project. This usually becomes a concern at RF frequencies. You will see such labels on video and TV equipment.A low-power 1 KHz square wave won't produce significant EMI --- FWIW the principal purpose of a line filter is protection of connected equipment from line noise...
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