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Light-Activated Switch

Here is a simple circuit of a light-activated switch that automatically turns on the light/lamp at night and switches it off during the day....

Small Variable Lab Power Supply for Young Experimenters

Lab power supply is the first thing needed by anyone who is extremely passionate about his electronics based experimental work. There are millions of...

Multi-Status Indicator Using Single RGB LED

Monitoring circuits in battery chargers, water-level indicators, etc use LEDs to indicate the status of certain conditions. Presented here is a multiple status indicator...

How to Construct a Gradual ON and OFF Bulb

This circuit can be used for making a beautiful light for your Christmas star or Diwali lanterns for your festive evening. The speciality of this...

5-Watt Audio Amplifier Using TA7222

Here is a simple 5-watt mono audio amplifier using IC TA7222 that drives a 4-ohm speaker using a 9V battery or a 9V DC...

Automatic Bike Turning Indicator

The automatic bike turning signal system based on a microcontroller (MCU) available in the market is expensive and difficult to program. Here is a...

Little Nightlight

Here we describe a very simple, economical and light-weight automatic nightlight that runs on 230V AC mains and can be used as a deluxe...

Door-Open Alarm

This door open alarm uses an input sensor fixed at the corner of the door frame and a magnet fixed on the door panel...

Battery-Powered Night Lamp Using an Old LED Bulb

This circuit utilises a low-cost 3W LED board to construct a battery-powered night lamp. This board consists of eight SMD2835 LEDs connected in series. Branded...

Power-Saving Relay Driver

In many circuits, the switching action is performed by a relay, which in turn activates an external load. The power consumed by the relay...

Window Charger

Keep away intruders with this compact electrified window charger. The charger produces non-lethal shocks that are strong enough to threaten intruders. Window Charger Circuit The circuit...

Optical Slave Flash Trigger

A "slave flash" (also known as speed light/strobe) is a flashgun that sits around quietly until it sees a bright light. When the slave...

Smart Switch Box for Mobile Chargers and Modems

Most of us leave our battery-operated devices like mobile phones, laptops, tablets, power banks and modems plugged into a charger overnight—even though these devices,...

Design Your Own Li-Fi Dongle And Speaker

Light Fidelity (Li-Fi) is a new paradigm in wireless communication. In this article, we describe the design of a Li-Fi dongle (transmitter) and speaker...

Battery Level Indicator Circuit Using LM3914

Battery level indicator indicates the status of the battery just by glowing LEDs. For example six LED’s are glowing means battery capacity 60% remains....

Automatic Plant Watering System with Melody

In our usual busy routine, one of the reasons for people hesitating to keep plants at their home is that people forget to water...

Laser Light Security Alarm

This article shows you how to create a DIY laser light security alarm, perfect for enhancing home security. The best part? It’s a simple project...

Simple Multi-Sensor Fire Alarm

The fire alarm circuit presented here raises an alarm on detecting flames and high temperatures. It can be used in two ways: A single...
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