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Battery Low Indicator

Rechargeable batteries should not be discharged below a certain voltage level. This lower voltage limit depends upon the type of the battery. This simple...

Versatile Water-Level Controller

This simple, economical and versatile water level controller circuit switches on the motor pump when water in the overhead tank falls below the lowest...

Two-Watt TBA820M AF Amplifier

Here is a simple AF amplifier project based on TBA820M IC. This amplifier can deliver two-watt output power with 8-ohm speaker using a 12V...

Wireless-Powered LED

Wireless power is transferred from transmitter to receiver coil using inductive coupling principle. For wireless power transfer to work efficiently, frequency of the transmitter...

Daytime Running Lights Controller

Auto makers have been gradually switching to light emitting diode (LED) lighting for automotive headlamps because of its features such as high efficiency and...

Anti-Theft Alarm for Vehicles

This simple and inexpensive anti-theft alarm circuit for vehicles sounds an alarm simulating a police siren whenever someone attempts theft of your vehicle. The...

Webcam View Illuminator

By setting up a webcam view illuminator over your laptop’s webcam your online conversations can become more enlightening. This clip-on light improves the quality...

Long-range Burglar Alarm Using Laser Torch

Burglar alarm using laser torches, normally work in darkness only. But this long-range photoelectric alarm can work reliably in daytime also to warn you...

Door-Opening Alarm Using Hall Sensor

This simple door opening alarm using hall sensor produces sound when someone opens the door. The circuit can be installed at a workshop, office...

Wireless Baby Monitor Circuit

This wireless baby monitor circuit using FM is designed to operate at a frequency of 100MHz. Its range of transmission is more than 100...

Light-Sensitive Fire Alarm

This light sensitive fire alarm circuit is extremely sensitive, low-cost and easy to assemble even by a beginner. It uses infrared photo transistor as...

Gas Leakage Alarm

LPG gas is supplied in pressurised steel cylinders. As this gas is heavier than air, when it leaks from a cylinder it flows along...

Electronics Projects: Simple Line-Following Robot

Generally, line follower robot is microcontroller-based. Here we describe a line follower robot without microcontroller for those who are not familiar with microcontrollers. It...

Stress Meter | Circuit Diagram With Full Explanation

This stress monitor lets you assess your emotional pain. If the stress is very high, it gives visual indication through a light-emitting diode (LED) display along with a warning beep. The gadget is small enough to be worn around the wrist.

Auto Switch-off Staircase Light

In areas like staircase or porch of your home, lighting is required only for a short period of time at night. We often forget...

Electronics Projects: How to Build a Lid-Monitoring Sensor Module

If you need a lid monitor sensor system for an application, this is the circuit you have been looking for. One application for such...

Electronics Projects: Build an RC Plane Finder

The lost plane finder introduced here is a little on board beacon, also known as lost model alarm/crashed aircraft beacon, which helps you find...

Transformerless Power Supply

One of the major challenges during a circuit design is to generate low-voltage DC from AC to power the circuit. There are many methods...
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