This tutorial is about Motor Speed Regulator Circuit for PCB Drills It control speed for clean and accurate holes. Main part of the circuit is LM3578 IC with feedback and 1V reference. It also has oscillator. LM3578 and IRF540 MOSFET adjust motor speed. They give smooth, adjustable speed for small PCB drills. Supply is from […]
Simple TDA7274 Based Low Voltage Motor Speed Controller Circuit
Simple TDA7274 Based Low Voltage Motor Speed Controller Circuit is useful and easy to make. Circuit is efficient and precise with speed adjust. TDA7274 IC is motor driver for low voltage and for low power DC motors. It works from 1.8V to 6V and has built-in voltage reference. Output is up to 700mA and is […]
Temperature Controlled Fan Circuit for Audio Amplifiers
Amplifiers make heat when working. Too much of heat make it work bad and can die soon. This Temperature Controlled Fan Circuit for Audio Amplifiers keep amplifier cool. Fan starts only when amplifier is hot. If volume is low and less heat then fan stays OFF and saves power. The circuit is made with LM311 […]
Transistor Based H-Bridge Motor Controller Circuit
Transistor Based H-Bridge Motor Controller Circuit controls DC motor spin both ways like clockwise, anticlockwise. The circuit helps control speed and direction by easy switch method. Name “H-Bridge” comes from shape like letter H which has 4 switches. In this post circuit is 4-transistor H-Bridge. Circuit is good for robotics, automation and other motor projects. […]
Motor Driver Circuit using IC TC4424
Motor Driver Circuit using IC TC4424 chip good for DC motor control. It drives 2 MOSFETs, works fast and only few extra parts are needed. Circuit is easy to build and can control motor spin direction. It power 10 to 18V DC which depends on motor. Motor current must be under 100mA. Circuit Working: Parts […]
Simple Mains Powered LED Light Circuit
Simple Mains Powered LED Light Circuit runs on 230V AC mains. It uses capacitor dropper to limit the current. LEDs in series-parallel are cheap and easy for mains lighting. They are with bright white light and no big transformer. It is good for low power light needs. Circuit Working: Parts List: Component Type Value/Specification Quantity […]