There is a super basic way to build an automatic battery charger using just a few parts. This circuit is like a simple machine for charging batteries by itself. It uses only a transistor a resistor and an LED. It is great for charging things like 9V batteries and even has a light to show […]
How to Find the Charging Current of a Battery
Knowing how much electricity (current) to use is important to safely charge a battery, just like needing the right amount of water for a plant. Most people use a tool called a multimeter to measure this, but not everyone has one. Here is a cool trick you can try if you do not have a […]
Simplest Blown Fuse Indicator Circuit
This circuit helps you easily identify a blown fuse without manually checking the fuse itself. When the fuse is intact a green LED lights up signifying normal operation. But if the fuse blows the circuit path opens and a red LED illuminates, indicating a blown fuse that needs replacing. Circuit Working: Parts List: Component Description […]
Simple li-ion Battery Capacity Tester Circuit
Visualize you have a phone battery, but how long does it really last on a charge? This tester circuit is like a battery fitness checker. It tells you how much power your Li-ion battery the kind in phones and laptops can hold helping you see if it is getting tired and needs replacing. This is […]
How to Generate a Safe 220V AC Supply
If you are working on electronics projects that need regular house voltage 220V AC. This voltage can be dangerous. To make it safe to use, you can connect a special device called a step down transformer. This transformer lowers the voltage to a safer level for your project and also includes safety features to protect […]
Simple Capacitive Touch Switch Circuit using IC TTP223
Forget the button, this circuit uses a clever chip called the TTP223 to sense your touch. Just like magic, touching a special pad can turn things on or off. It is a simple way to create a touch sensitive switch for projects or even pranks. Circuit Working: Parts List: Component Description Quantity Wattage Resistors 1/4 […]