Indeed Amit - and it is those "details" - almost "never" provided - which endlessly land upon these rocky (uncharted/unguided) shores. Poster - while questioned under bright lights - did reveal, "acoustic sensor" - seems that a fairly simple "op-amp" configured as, "Sample/Hold Peak Detect," would meet the (unspecified) requirements. It is always delightful when the post's "actuality" - emerges from its cocoon - only after a (too long) period of gestation... Never would we "hoist sails" w/out our sea charts - such precautions have value (far outside) water-craft...
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