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Working on the electronic stethoscope instructable. NEED HELP! Answered

Working on the electronic stethoscope intractable. And i dont understand the circuit diagram for where the 9v battery is suppose to go?


https://www.instructables.com/id/Electronic-Stethoscope/step3/Build/

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iceng

5 years ago

Put the positive of the 9V battery at the + sign on top.

Put the minus of the 9V battery on the bottom line where the ground
symbol is located just below the headphones text.

A