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About the LM567

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What is an "impulsion"?
 
The Phillips data sheet explains the part operation a little better than the National data sheet.

The frequency range, centered about fO, within which an input signal
above the threshold voltage (typically 20mVRMS) will cause a logical
zero state on the output
. The detection bandwidth corresponds to
the loop capture range

So when input tone is detected, output goes low.

https://www.electro-tech-online.com/custompdfs/2011/08/NE_SE567.pdf
 
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