How can I improve this interface for the noise through the audio interface?

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Amyniuo
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How can I improve this interface for the noise through the audio interface?

Post by Amyniuo » Fri Jun 09, 2017 8:37 am

I want to count pulses through sound-card of a PC or a smartphone's audio port. Two different pulses will originate from two LM331(http://www.kynix.com/Detail/1169657/LM331.html) and I can scale them to 1V or any amplitude.

I want to feed these pulses to the audio port of a sound card's channels. Then the rest is to software to count the pulses.

So far I plan to use this analog interface between the pulses and the audio jack and sound-card:
Image

Do you think the topology is correct? How can I improve this interface for the noise? I am only interested to count pulses not to view any other signal.

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