Hello!
I have to build a bandpass filter, noise filtering and removing the DC component for a signal, the range is [0.5-5 Hz].
I am using the following design:
http://img199.imageshack.us/img199/2947/badnpass.jpg
Considering my available components (but I am planning
to use more coherent stuff)
Part high-pass:
C1, C2 = 1 microF
R1 = 450 KOhm
R2 = 225 kOhm
Part lowpass:
R1, R2 = 8.2 KOhm
C1 = 4.7 microF
C2 = 2.2 microF
-------------------------------------------------- --------------
Here are my questions,
1. Using a wave generator and an oscilloscope, how do I test that the allowed band is effectively [0.5-5 Hz] ? What differences should I see if I send as an input a square/triangle/pseudo-sinus wave inside and outside the band ?
3. I need to avoid dual supply amplifier, 'cause the rest of the circuit is aa single supply. Assuming I have some LM386 and LM358, is it correct to just use the bottom circuit in the picture I posted ?
4. Considering I want to filter a signal coming from a photodiode and a transimpedence amp. removing noise and DC component. Can I stick with the filter I posted, or should I investigate more about Butterworth, Bessel and so on filter .... ?
I have to build a bandpass filter, noise filtering and removing the DC component for a signal, the range is [0.5-5 Hz].
I am using the following design:
http://img199.imageshack.us/img199/2947/badnpass.jpg
Considering my available components (but I am planning
to use more coherent stuff)
Part high-pass:
C1, C2 = 1 microF
R1 = 450 KOhm
R2 = 225 kOhm
Part lowpass:
R1, R2 = 8.2 KOhm
C1 = 4.7 microF
C2 = 2.2 microF
-------------------------------------------------- --------------
Here are my questions,
1. Using a wave generator and an oscilloscope, how do I test that the allowed band is effectively [0.5-5 Hz] ? What differences should I see if I send as an input a square/triangle/pseudo-sinus wave inside and outside the band ?
3. I need to avoid dual supply amplifier, 'cause the rest of the circuit is aa single supply. Assuming I have some LM386 and LM358, is it correct to just use the bottom circuit in the picture I posted ?
4. Considering I want to filter a signal coming from a photodiode and a transimpedence amp. removing noise and DC component. Can I stick with the filter I posted, or should I investigate more about Butterworth, Bessel and so on filter .... ?
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