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So this way we always get a variable voltage which completely depends on the light intensity. LDR is also a variable resistor but its resistance changes as the light falling on the LDR changes. This is a current limiting resistor.Īn LDR and a potentiometer are connected in series which makes a voltage divider. A 330 ohm resistor is connected in series with a 2.5V LED. Two 470uf capacitors are connected at the input and output sides of the voltage regulator. The positive and GND pins of the DC female power jack are connected with the input and middle legs of the 7805 voltage regulator. So first let’s start with the 5V regulated power supply based on the LM7805 Voltage regulator. Let’s have a look at the Circuit diagram and understand how this project works. I did one modification in this project which is I added a potentiometer so that the sensitivity can be controlled as per the requirement.

The brightness of the LED depends on the light falling on the LDR which stands for Light Dependent Resistor. Number 4 on the electronic projects list is the Light Meter which is one of the viral projects. I would appreciate your support in this way! I may make a commission if you buy the components through these links. Without any further delay let’s get started!!! You can update the circuit at anytime, you can replace the 2n2222 NPN transistors with the BC547 and it will have no negative effect on the project. So it really doesn’t matter whether you want to use 2n2222 or BC547 NPN transistor. The same electronic projects can also be developed using the BC547 instead using the 2n2222 NPN transistor.

Portable security system using Mini PIR Sensor.

Non Contact AC line Voltage detector/tester.

We will make the following four projects using the 2N2222 NPN transistors. The Gerber files of the PCB board used in this project can be downloaded from the PCBWay official website. PCBWay is quite professional in the field of PCB manufacturing you can try their services at extremely low prices, Only 5 dollars for 10 PCBs and 30 dollars in total for 20 PCBs assembly, besides this the new members also get a 5 Dollars bonus. The 12V and 5V power supply PCB board used in this video is sponsored by the PCBWay Company. For step by step explanation you can watch a video tutorial given at the end of this article. I will also explain the working principle of each electronic circuit, and we will test each circuit on breadboard. In this article, we will develop the same electronic projects using the most popular 2n2222 NPN transistors. Recently some electronic projects got viral which were completely based on the BC547 Transistor. So many amazing electronic projects can be built using this transistor. Electronic projects with 2n2222 Transistor or BC547 Transistor- BC547 NPN Transistor is of the most popular Bipolar Junction Transistors.