Smoke alarm circuit (1)
Source: InternetPublisher:他们逼我做卧底 Keywords: Smoke alarm alarm circuit LED Updated: 2021/12/17
Circuit working principle: H21A1 (lC1) is an infrared optical switch, which is actually
a photointerrupter. R1 limits the current through the LED in IC 1 . The transistor part of IC1
is in a conducting state under normal circumstances, so the base of VT1 is at a low potential. The preset potentiometer
Rp determines the threshold level for circuit triggering, and R2 provides additional
protection functions for VT1 and IC 1.
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