Overview Imagine you’re on a camping trip, far from power outlets, but your phone’s battery is running low. You wish you had a way to charge it using the USB port on your power bank. … Read more
BD139
Introduction RGB LED has great usage nowadays, usually used for decoration for different occasions. For example, they can use it in stage lighting, at parties, weddings, etc. It is an LED having three terminals, RGB … Read more
How to make RGB LED Controller
Introduction DC motor technology has advanced significantly and is now used extensively across various sectors. One of the most practical aspects of the motor is its ability to control speed. You may change the motor’s … Read more
Forward Reverse DC Motor Control Diagram with Timer IC
In this tutorial, we are going to make a “100-watt Inverter circuit 12V to 220V using Transistor”. A power inverter is a power electronic device or circuitry that changes direct current (DC) to alternating current … Read more
100 Watt Inverter Circuit 12V to 220V using Transistor
An LED Emergency Light powers ON when there is not enough lighting or if the main power supply is cut-off. Earlier, fluorescent lights were used to build such circuits. But the use of LEDs has … Read more
LED Emergency Light Circuit Using LDR (Light Dependent Resistor)
The BD139 is silicon Epitaxial Planar NPN transistors mounted in Jedec SOT-32 plastic package, designed for audio amplifiers and drivers utilizing complementary or quasi-complementary circuits Power Transistor? Transistors are three-terminal semiconductor electronic devices that can … Read more
BD139 NPN Power Transistor – Datasheet
In this tutorial, we are demonstrating a project of a Car reverse alert buzzer and flasher circuit. this circuit is used to indicate to any person, pets, or children standing or playing around your car … Read more
Car Reverse Alert Buzzer & Flasher
A 12V to 24V DC-DC converter is an important part of today’s electronics. They are generally used for industrial purposes such as load matching for variable drives & also for the testing/troubleshooting of small-scale electronics. … Read more
12V To 24V DC-DC Converter Circuit
A DC to DC Adjustable Boost converter/power supply is an electronic device capable of converting a source of direct current (DC) from one voltage level to another. They fulfill a wide array of requirements in … Read more
DC to DC Adjustable Step Up Boost Power Supply Converter
A 3V 1A DC supply is an important power supply unit (PSU) in use for academic as well as industrial purposes. It serves as an interface between a common wall outlet and various power electronic … Read more
3V 1A DC Supply Using BD135/139 NPN Transistor
Here we are going to demonstrate a simpler version of a temperature-controlled DC fan. You can control any 12 volts 1A DC fan with this circuit according to the temperature changes. To detect the temperature … Read more
Simple Temperature Controlled DC Fan
In this tutorial, we are going to make a wireless power transfer project. As the name suggests wireless power transfer is a process in which electrical energy is transferred from one system to another without … Read more
Wireless Power Transfer Project using 555 Timer
12V to 3V Converter (DC-DC) is a common preference of electronic hobbyists and enthusiasts for small/low-end electronic projects. These low-end DC-DC converters provide a simple, easy & cheap way of building your own test supply … Read more