Buzz_box_continuity_and_coil_checker_using_an_LM3909_chip

Published:2009/7/19 20:24:00 Author:Jessie | From:SeekIC

Buzz box continuity and coil checker using an LM3909 chip. Circuitry inside dashes is the LM3909. A short up to 100 ohms will cause a tone to be generated. By probing two values, such as a direct short and 5 ohms, a difference can be detected if done in quick succession (courtesy National Semiconductor Corporation).



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