HEAT_OR_LIGHT_ACTIVATED_ALARM

Published:2009/6/14 22:06:00 Author:May | From:SeekIC

The tone generated by a 555 oscillator can be turned on (activated) by heat or light. That causes Q1 to conduct transistor W2 (TIP 3055).Q2 (TIP 3055) acts as an audio amplifier and speaker driver.



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