Page 5 - Electronics Starter Kit_EN

20.4 PWM (Pulse width modulation) 77
20.5 Circuit Explanation 78
20.6 Example Picture 79
Lesson 21: Break Beam Detector Buzzer with NE555 and Photoresistor 80
21.1 Overview 80
21.2 Components Required 80
21.3 Circuit 80
21.4 Circuit Explanation 81
21.5 Example Picture 83

Lesson 22: Light Reactive Theremin with NE555, Photoresistor and Buzzer 84
22.1 Overview 84
22.2 Components Required 84
22.3 Circuit 84
22.4 Circuit Explanation 85
22.5 Example Picture 85

Lesson 23: Doorbell 86
23.1 Overview 86
23.2 Components Required 86
23.3 Circuit 87
23.4 Circuit Explanation 88
23.5 Example Picture 88

Lesson 24: Timer/Delay 89
24.1 Overview 89
24.2 Components Required 89
24.3 Circuit 90
24.4 Circuit Explanation 91
24.5 Example Picture 92

Important Note: If something unusual happens or if you suspect that something is wrong or has
malfunctioned, do not do anything with the product and immediately contact the seller. For
inquiries and assistance, please reach us via email address: office@plusivo.com

To know more about our other products, please visit us in our official pages:
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Electronics Starter Kit r.00 www.plusivo.com