A cheap stethoscope, a lavalier mic, and a couple bucks worth of parts from the hardware store gives you The Amazing Stethophone!

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Stethoscope from Amazon: https://amzn.to/2QOLBX3

Pixel 909 T-Shirt: https://analog-industries.myshopify.com/

Analog Industries Blog: http://www.analogindustries.com/