Simple Smoke Detector
Use immediately

Simple Smoke Detector

4

2

IC1

5

1

+

VR1

2.2K

R1

100Ω

H21A1

PHOTO

INTERRUPTER

MODULE

T1

BC547

T2

2N2222

R2

100K

VR2

1M

LED1

R3

680Ω

PZ1

PIEZO-

BUZZER

S1

ON/OFF

SWITCH

C1

100μ

25V

9V

BATT.

Simple Smoke Detector

15
0
1
publish time: 2020-09-29
Circuit Everyday

This simple smoke detector is highly sensitive and inexpensive. Its amplifier uses two npn transistors and an infrared photo interrupter module as the sensor. As long as there is heavy smoke around the circuit, an audio-visual alarm will be issued.

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