LPF question

[stoica adrian]

Hello,
I have two qestions, if you can help me.
What happens after you pass the 3db point of a LPF, and witch is the maximum ° that you can obtain with a LPF?

[Bassman59]

Hello,
I have two qestions, if you can help me.
What happens after you pass the 3db point of a LPF,

Pass it from which side? To the right (increasing frequency) of the 3 dB point, the response increases towards unity, at which point it flattens out. To the left of the 3 dB point, the response decreases with a slope given by the number of poles in (the order of) the filter. One pole, your attenuation goes as 6 dB/octave. Two poles give an attenuation of 12 dB/octave, and so forth.

and witch is the maximum ° that you can obtain with a LPF?

That too depends on the order of the filter.

[Circlotron]

RC low pass filter output would approach 90 deg phase lag, I expect.
Probably never quite get there.

[David Hess]

90 degrees maximum per pole or order.

[Audioguru]

A single R and a single C makes a very poor filter. it rolls off at only 6dB (half the level) for each octave (10 times the frequency). Use an opamp or a few to make a multi-order active filter.

[Wimberleytech]

A single R and a single C makes a very poor filter. it rolls off at only 6dB (half the level) for each octave (10 times the frequency). Use an opamp or a few to make a multi-order active filter.

I know you meant "octave (two times frequency)"