This Simple Cell Phone Charger Circuit using 1.5V Battery is one special charger we can take anywhere but there is no need to plug. We can charge phone anytime. It uses normal AA or AAA battery same like in TV remote. Inside, it have part which make weak battery power strong so phone can be […]
Simple LED Driver Circuit using IC 7555
Simple LED Driver Circuit using IC 7555 uses one special chip called as 7555 IC. People mostly use it for timing but here we have used for different way. It work like boss and control how electricity connects to LEDs. Chip make special pulse signal like square wave and this signal connects to transistor which […]
Simple LM317 Audio Amplifier Circuit
This Simple LM317 Audio Amplifier Circuit is a kind of like small trick for make speaker sound louder. LM317 chip usually is used to control voltage but here it works like small music booster amp. Not very strong amp but still help give little more sound from the music source. It can work, yes but […]
Simple Micro Ampere Meter Circuit
Simple Micro Ampere Meter Circuit is like a special tool to measure small electric. Normal tools too are strong but are not good for tiny current. But this one uses super sensitive meter microammeter or maybe special setting on multimeter to find very small electric flow like millionth of amp. Other parts like resistors and […]
Simple Light Activated Alarm Circuit
This Simple Light Activated Alarm Circuit is like very sharp nightlight. It have small part called LDR which work like a tiny eye. When light goes away fast like someone is moving near circuit it make sound or light happen to warn us. It also uses other parts like transistors, resistors, capacitors to make it […]
Simple Skin Biofeedback Circuit
This one is a special and Simple Skin Biofeedback Circuit which help people learn about skin. It uses sticky pads put on skin to catch small electric signal. Signal change when person feel more calm or is not calm. The circuit show this change maybe with light or sound so person can learn to relax […]