CALCULATOR_TO_STOPWATCH_CONVERTER

Published:2009/6/25 2:17:00 Author:Jessie | From:SeekIC

This circuit can be fitted to any calculator existing with an automatic constant to enable it to be used as a stop-watch. The 555 timer is set to run at a suitable frequency and connected to the existing calculator battery via the push-on push-off switch and the existing calculator on-off switch.



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