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Circuits designed by David Johnson, P.E.
Last Updated on:
Wednesday, October 18, 2017 05:04 AM
List of Dave's Circuit Designs
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Beepers & Buzzers Circuits
Engine Beeper (June 30, 2005)
designed by David A. Johnson, P.E.
into a car’s indicator light panel, this circuit will turn on a loud beeper when the
“check engine” light turns on.
eMail David A.
Johnson, P.E. about this circuit
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