The 4093 is a 14-pin package containing four positive-logic, 2-input NAND Schmitt trigger gates as shown in the following figure. It is possible to operate the four NAND gates separately […]
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Ultrasonic Burglar Alarm Circuit
An ultrasonic burglar alarm circuit is an electronic device which transmits ultrasonic waves to detect the movement of an intruding person. The ultrasonic waves hit the intruder and the reflected […]
7 Automatic Street Light Circuits [Using Relays and Solar Panel]
In this article we will discuss 7 useful yet simple automatic street light circuits using 220 V relays and solar panel. All the presented circuits can be used for automatically […]
Bicycle Speedometer Circuit
In this article we will learn how to build a simple bicycle speedometer circuit which can be used to measure the speed of the bicycle. Video Demonstration What is a […]
Light Meter Circuit with LED Bar Graph
In this post we will discuss 3 different light meter circuits for measuring power of light. In the first method we will use only a solar cell and a multimeter, […]
Temperature Controlled Relay Switch Circuit
In this article we discuss a simple temperature controlled relay circuit which can be switched ON/OFF depending on the temperature on its temperature sensor. Meaning, when the temperature on its […]