One way to give steady current to laser diode is using a Simple Laser Diode Driver Circuit using IC LM317. Laser diode are very sensitive to current and with wrong current can damage it. LM317 usually gives voltage but here it gives constant current instead. Circuit Working: Parts List: Category Item Quantity Resistors 330Ω 1/4 […]
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Basic Circuit for Multi-Way Lamp Switching
We can control one bulb from many places using Basic Circuit for Multi-Way Lamp Switching. Three-way switches are also called two-way and four-way switches are also called intermediate which are also used. Three-way switches go at both ends like at hallway doors. They have 3 terminals: Traveler 1, Traveler 2 and Common. Four-way switches go […]
Simple Door Keyhole Light Circuit
When ON, small device like Simple Door Keyhole Light Circuit gives light to keyhole. It helps to put key in hole when light is low. It uses light sensor and circuit to check light level. To switch it by light we used transistor and LDR. Circuit Working: Parts List: Category Item Quantity Resistors 47k 1/4 […]
Simple Electronic Candle Circuit using LDR
This article for Simple Electronic Candle Circuit using LDR is fun and easy project to make fake candle with LED. It uses LDR to make LED flicker like real flame and turns ON when its dark. LDR controls the LED. In bright light the LDR has high resistance so LED stays OFF. And when its […]
Simple Motor Powered Emergency Flashlight Circuit
This is Simple Motor Powered Emergency Flashlight Circuit which is easy to make for emergency light. It uses motor like generator to make power. Power goes to LED for light and charges the supercapacitor. And then it turns motor to charge. Circuit Working: Parts List: Component Type Description Quantity Resistors 220Ω 1/4 watt 1 Semiconductors […]
12V SMPS Driver Circuit for LED Strip
12V SMPS driver change big AC power from 110V or 220V into small 12V DC. Circuit is good for LED strip light. In this DIY we make cheap and strong LED driver. It can power full 12V LED strip with 100 or 200 LEDs. Important points to follow: Circuit uses 230V AC direct which is […]