Loop-Based Anti-Theft Alarm
Presented here is a loop-based anti-theft alarm circuit using a simple wire loop as sensor. It can be used to protect any device against...
Automatic Infrared Faucet Controller
Described here is an easy-to-use circuit of an automatic infrared (IR) faucet controller suitable for hand hygiene and water conservation at homes, hospitals and...
Simple Obstacle-Avoiding Robot
Presented here is an obstacle-avoidance robot without microcontroller (MCU). The obstacle-avoidance feature is commonly found in autonomous cars and robots. Most obstacle-avoidance robots are...
Smart Programable OLED Badge
You might have seen and used badges with various logos and smiles. But have you ever seen any electronic badge?
In this project, we are...
Automatic Fan Controller For An Active Heatsink
This Automatic Fan Controller circuit is based on a thermistor and an operational amplifier (op-amp) that drives a MOSFET to switch a cooling fan...
AC Switch Control With Opto-Triac
AC switches are silicon devices that control AC loads directly connected to the AC mains. This means that the driving reference terminal of the...
Plus-minus 5V Supply From 9V Battery
Op-amps require dual-polarity supply for proper operation. When working with battery supply, it becomes difficult to get dual power supply for the op-amps. Presented...
Turn Your Old Inverter Into An Emergency Power System
An inverter turned into an emergency power system, which turns on when the mains supply fails, and more importantly doesn’t turn on when the...
Transform Your Recordings: Crafting an 8-Input Audio Mixer with Pro-Level Controls!
When recording sound from several orchestral instruments being played by different musicians using a single microphone, the only way to adjust the sound balance...
Simple Line Follower Robot Using LM358
Presented here is the design for a relay-based line follower robot without using a microcontroller (MCU). The robot provides a simple application to get...
Low-Noise 5V DC Converter Using LM2574
This circuit is used to convert DC voltages like 9V and 12V to 5V, 500mA DC, which is suitable for embedded systems.
Use of a...
Unique LED Lantern
Presented here is an LED lantern that also functions as an emergency light or a tent light. The design has all required functions, including...
Low-Cost Versatile Hand Mixer
Mixing liquids using a muddler or churner is a traditional technique. However, it is time-consuming and sometimes fails to mix these properly. Here is...
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...