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Solar USB Bicycle Power Box

The circuit presented here can be used to drive USB-powered smart devices, including smartphones, while riding a bicycle. Smartphones suck battery power extremely fast,...

DC Motor Speed Controller

Here is a simple DC electric motor variable speed controller circuit that can be configured to control the sweep rate of automobiles’ windscreen wipers. The...

Automatic Plants Watering System With Melody

Here is a circuit for automatic plants watering, which can be undertaken every morning without any human effort. A sensor is used to detect...

Alarm using your own Voice

This alarm plays your prerecorded voice message. It is built around the readily available quartz clock. Take the buzzer out of the quartz clock...

Magnetic Walking Stick for the Visually-Impaired

A white cane is used by the blind or the visually-impaired to scan the surroundings for obstacles and orientation marks, and find the correct...

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...
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