Is a Low Pass Filter Suitable for a Basic Noise Filtering Circuit?

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A low pass filter is suggested as a potential solution for noise filtering in a basic circuit, but concerns are raised about the effectiveness of using a CDS cell for audio applications due to its slow response time. Users recommend considering a high-speed photodiode instead, although this would require a redesign of the circuit. The feasibility of the entire project is questioned, with some expressing skepticism about the practicality of the proposed design. A proper laser doppler vibrometer is mentioned as a more effective, albeit expensive, alternative. Overall, the discussion highlights significant challenges in achieving the desired audio functionality with the suggested components.
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i want to build one of these

http://funditor.110mb.com/LaserListener.html

but he alludes to some kind of circuit at the end that could filter out the noise using analog components and I'm thinking it's some kind of low pass filter. am i right? i really only have a little electronics knowledge? i guess i need something called a preamp too? note I'm not malicious or anything i just think it would be a fun little project.

basically i want it to be portable cause i don't have a laptop
 
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Don't bother. I can't believe the author has actually built that. A CDS cell (cadmium sulfide) does not have a fast enough response time to actually be useful with audio.
 
Averagesupernova said:
Don't bother. I can't believe the author has actually built that. A CDS cell (cadmium sulfide) does not have a fast enough response time to actually be useful with audio.

:( really ? that's exactly the kind of photocell i bought, what kind can i use?
 
A cheap CDS cell has a response time of the order of 0.1sec so you are not going to get much audio out of it.

You could use a high speed photodiode, but you would have to redesign the rest of the circuit, and the whole idea looks a bit far fetched to me.

You use a proper laser doppler vibrometer (LDV) - that would work, but not in your price range!
 

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