LOW_POWER_TOUCH_TONE_DECODER

Published:2009/7/10 22:11:00 Author:May | From:SeekIC

This decoder will respond to a preselected 4-digit DTMF number. IC7 is a Radio Shack IC device (part #276-1303). The logic is all CMOS. The digits are selected by SW1 and SW2, a pair of 8-position DIP switches.



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