ACTIVE AUDIO FILTER

[nanopoylos]

hello guys
i wanted to make an active filter for my car
nothing special

no need to be adjustable , no need to have more gain , my car r/cd is 4 volts preout

i found some very interesting chips in maxim
active filters with programmable q,f0,anything
i bought some ic's from maxim max262,264,265,274,275,278
i have the documentation but its very complicated to me

i am ascing if someone has a site with ready projects for this chips or with other chips
i do not want to use op-amps nad calculate anything on the paper , i just cant , i do not know how to do that

i think the project with maxim is much more easy but i cant make it work

please help me anyways
thank you

 

[MP1]

hello guys
i wanted to make an active filter for my car
nothing special

no need to be adjustable , no need to have more gain

You are wanting to use the wrong chips for an easy off the shellf active filter. These are meant to be controlled with a microprocessor and they need a clock control as well. There are basic active filter chips out there.

MP

 

[nanopoylos]

well not all work with pic's
some work with resistors

but you are right , i did something wrong

please tell me what to buy from maxim to build a stereo active xover 3 way , or 2 way

or some links

thnx

 

[MP1]

Here is one such chip.

MP

UAF42_Universal_Filter_IC.pdf

 

[MP1]

Here is also a tutorial that I posted a few years ago to build and calculate your own.

MP

State_Variable_F.zip