TWO_DOOR_ANNUNCIATOR

Published:2009/7/8 23:06:00 Author:May | From:SeekIC

When the pushbuttons at either door are depressed, this circuit generates a different tone for each door. Tones are generated by phase-shift oscillator Q1/Q2. Q3 provides tone frequency change by chang-ing the phase-shift network. U2 and U3 are timers for the tones and Q4/Q5 interface the timers with the pushbuttons.



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