Tools Featured in this Teardown


For our reverse engineering project, we chose to use the smoke detector. This smoke detector consists of a sensor to detect smoke and a loud electronic buzzer to alert people within the building.

This teardown is not a repair guide. To repair your Gas and Smoke Detector, use our service manual.

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  • Use a screwdriver to pry open the plastic enclosure. It might be easier to push the buzzer through the hole, if you need extra leverage.

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  • The buzzer is unhooked from the PCB board, by hands.

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  • This is the circuit for the smoke detector. It is powered by a 9V battery. The 3 metal leafs are contacts for the buzzer and the bigger leaf is for the test button.

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  • The metal cap is removed to reveal a, MC145017, driver chip and americium sensor. Do not remove americium from the sensor!

why did you do this do you know how dangerous that is americium 231 is a highly radioactive metal you could HAVE KILLED YOURSELVES

alexander matthiessen - Reply

Ari Dubinsky

Member since: 03/04/2014

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1 Guide authored


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