Imagine we have a phone battery but how long does it really last? This Simple Li-ion Battery Capacity Tester Circuit is like a battery health checker. It shows how much power our Li-ion battery like in phones or laptops can still hold. It helps us know if the battery is getting weak and needs change. […]
How to Generate a Safe 220V AC Supply
If anyone’s project needs How to Generate a Safe 220V AC Supply from home power, then this is the circuit but we need to be careful. This voltage is dangerous. To stay safe we can use a step-down transformer. It makes voltage lower and safer. It also has safety parts to stop electric shocks. Circuit […]
Simple Capacitive Touch Switch Circuit using IC TTP223
No button needed as this circuit uses a smart chip known as TTP223 to feel our touch. Like magic it touches the pad and it turns ON or OFF This Simple Capacitive Touch Switch Circuit using IC TTP223 is an easy way to make a touch switch for fun or projects. Circuit Working: Parts List: […]
3V LED Driver Circuit using IC LT1937
This 3V LED Driver Circuit using IC LT1937 is small LED driver. It uses IC LT1937 which can run white LED from only 3V battery. IC take low voltage and boost up for LED. Circuit is good for mobile light, small torch, display backlight. It save power and give stable bright light. Block Diagram: See […]
Simple Counterfeit Money Detector Circuit
Simple Counterfeit Money Detector Circuit is like smart light. It uses UV light to show secret mark on real note. It also uses magnetic sensor to feel the special ink. Sometimes it uses IR light to see real money pattern. If no special thing is found then maybe the note is fake. But this tool […]
Simple Voltage Controlled Oscillator Circuit
Imagine a small device that make sound like whistle but we can turn one knob to make sound go high or low. This is same like what Simple Voltage Controlled Oscillator Circuit or VCO can do. It is an electronic thing that make signal again and again mostly like in square wave. The speed of […]