Telephone calculagraph circuit diagram

Published:2011/4/29 3:54:00 Author:Rebekka | Keyword: Telephone calculagraph | From:SeekIC

Call timer circuit is shown as below, phone timer uses 1 minute or 3 minutes for a timing unit. It starts automatically when the telephone is connected. It uses 10 LEDs jumping show the length of time. The timer circuit is simple, easy tuning. It is suitable for the electronic hobbyist.



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