LED turn on by LDR when dark. LDR and resistor connect in voltage divider circuit. In bright light transistor base get low voltage so transistor stay OFF. When dark come LDR resistance goes down and base voltage goes up with transistor turn ON and LED light up. This Simple Darkness Detector Circuit is easy to […]
Motion Detector Circuit using IC 555
This easy Motion Detector Circuit uses IC 555 to find human from far. Circuit have two parts: Transmitter: IC 555 work like astable multivibrator and it make square wave signal. This signal goes out through IR sensor (infrared). Receiver: Phototransistor see IR beam. If someone moves and block the beam then phototransistor work and turn […]
Boost Converter Circuit using IC 555
Boost Converter Circuit using IC 555 take low DC voltage and makes high DC voltage and is used for IC 555. IC 555 make PWM signal to control other parts. Other parts used are IRFZ44N, inductor, diode, resistor and capacitor. Circuit Working: Parts List: Component Type Description Quantity Resistors 1k ohm 1/4 watt 1 Potentiometer […]
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 […]
Amplifier Speaker Turn-On Delay Circuit
As name say this Amplifier Speaker Turn-On Delay Circuit wait few seconds before connecting speaker to amplifier. When amplifier is first turn ON then big “thump” noise can happen. This delay stop that bad sound. Circuit Working: Parts List: Component Type Description Quantity Resistors 33k 1/4 watt 2 1k 1/4 watt 1 Capacitors Electrolytic 100μF […]
Logic NAND Gate Circuit using Transistors
Logic NAND Gate Circuit using Transistors is very important in digital logic. It work opposite of AND gate. Output is HIGH when any input is LOW. NAND gate is called “universal gate” because we can make all other gates like AND, OR, NOT using it. Truth Table for Logic NAND Gate: Input A Input B […]