Help with active filters

[RiPz]

i'm not the strongest electronic engineer.. and i'm struggling to get ANY of the three filters i need working.. i'd appreciate it a LOT of someone could design the three for me...

i need:

1 low pass... letting through 150Hz and below

1 Band pass... letting thruogh between 150Hz and 1000Hz

1 Band pass... letting through between 1000Hz and 20000Hz.

i have +5v, +12v, and 0v supplies availible...

Thanks

\\RiPz//

 

[Phasor]

Well, show us your ideas so far, and we'll be happy to comment on them - there are quite a few different active filter designs floating around; do you have any other requirements besides the particular bandwidths? And what is the application?

 

[Russlk]

These are Butterworth filters. I will give the component values and a picture of the high pass - low pass circuit used in the 150 to 1000 hz bandpass.

150 Hz lowpass: R = 1 meg, C1 = 1.48nF, C2 = 3.76nF, C3 = 215pF
150 Hz highpass: C = 1nF, R1 = 762K, R2 = 299K, R3 = 5.24MEG
1000 Hz lowpass: R = 100K, C1 = 2.2nF, C2 = 5.6nF, C3 = 322pF
1000 Hz highpass: C = 1nF, R1 = 114K, R2 = 44.9K, R3 = 786K
20kHz lowpass: R = 10K, C1 = 1.1nF, C2 = 2.8nF, C3 = 161pF

Use the closest standard value to those listed.