Introduction to Microcontrollers
Posted inMicrocontrollers

Introduction to Microcontrollers

Microcontrollers are such semiconductor devices that act like a computer and can run any hardware level program written into it. You can program an microcontroller to glow a LED whenever…
Automatic quick turn on LED in dark
Posted inLED Driver

Automatic quick turn on LED in dark

Earlier I’ve showed how to reuse waste mobile batteries for LED lighting. There was darkness detector part built upon a switching transistor and a LDR. Since the switching transistor was…
Simple LM358 OP-AMP based USB Li-ion charger
Posted inOthers USB

Simple LM358 OP-AMP based USB Li-ion charger

UPDATE: https://www.circuitsdiy.com/usb-li-ion-charger-revision This is a simple li-ion charger without a dedicated li-ion charger IC. This circuit can be used to efficiently and intelligently charge any single cell Li-ion battery pack…
Inverter circuit project – up to 500 Watt
Posted inInverter

Inverter circuit project – up to 500 Watt

This is a complete inverter circuit project which features automatic mains switching, automatic charging when mains is present, and automatically starts inverter when mains is off. Get the full size inverter…
USB MP4 video player kit review
Posted inUSB

USB MP4 video player kit review

This is an outdated kit, no longer available. After a lot of search, finally I’ve found a USB/SD video player kit. This kit is priced a bit high at 480Rs(as…
Simple 3 Band Graphic Equalizer with BC548
Posted inAmplifier

Simple 3 Band Graphic Equalizer with BC548

This is a simple 3band graphic equalizer for audio amplifiers. There are three controls for three ranges, low frequency,mid frequency,and high; or simply for Bass, Treble and Mid range. This…