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![How to make a Simple Fire Alarm Circuit](https://circuitdiagrams.in/wp-content/uploads/2020/05/Untitled-1-e1608376213230.jpg)
Electro Gadget
Simple Fire Alarm Circuit Using Thermistor And LM358
![Arduino Digital Tachometer](https://circuitdiagrams.in/wp-content/uploads/2020/07/Tachometer-1-e1608375869715.png)
Electro Gadget
Digital Tachometer Using Arduino IR Sensor
![Led Chaser Using 555 Timer and 4017](https://circuitdiagrams.in/wp-content/uploads/2020/07/Led-Chaser-1-e1608376050451.png)
Electro Gadget
LED Chaser using 555 Timer and 4017 Counter
![Ultrasonic-Sound-Generator](https://circuitdiagrams.in/wp-content/uploads/2021/07/Ultrasonic-Sound-Generator.jpg)
Electro Gadget
How To Make Ultrasonic Sound Generator Using 555
![Infrared Sensor Using LM358](https://circuitdiagrams.in/wp-content/uploads/2022/08/InfraredSensorUsingLM358-scaled.jpg)
Electro Gadget