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Control Four Appliances with a Touch Switch Panel

This project is based on a capacitive touch sensor for controlling four electrical appliances. Toggle switches have been used for operating lights or fans,...

HVDC Power Supply Design

Circuits like Geiger counters, insect zappers, Nixie tubes and sensors require high-voltage direct-current (HVDC) supplies. There are various types of HVDC power supply designs...

Meter To Measure Short Distances

This Arduino-based distance meter can be used for measuring the distance between the sensor and object in the range of 2cm to 400cm using...

LED Torchlight

Most commercial torchlights use three AA or AAA cells connected in series, which produces 4.5V to drive white LEDs using a current-limiting resistor. These...

Voltage Regulator as Audio Amplifier

LM338 voltage regulator can also be used as an audio amplifier. The output voltage can be controlled by varying the IC’s reference voltage (pin...

Minuscule LED Night Marker

The minuscule LED night marker presented here is an automatic light beacon that wakes up at night, or when there is not enough ambient...

Automatic Water Level Controller Circuit: Design and Operation

Here is a simple automatic water-level controller for overhead tanks that switches on/off the pump motor when water in the tank goes below/above the...

12V Battery Absorb and Float Charger

Most battery chargers stop charging the battery when it attains its maximum charging voltage set by the circuit. This 12V battery charger circuit charges...

5W Stereo Audio Amplifier

Here is how we can build a 5W stereo audio power amplifier based on TEA 2025 IC and two potentiometers for left and right...

PC-based Oscilloscope Using Arduino

Oscilloscopes are an essential tool for electronics hobbyists and professionals to verify that their designs would work as expected. PC based Oscilloscope score over...

Speed Control Of DC Motor Using Pulse-Width Modulation

Pulse-width modulation (PWM) or duty-cycle variation methods are commonly used in speed control of DC motors. The duty cycle is defined as the percentage...

Force-Operated Toy Organ

This toy organ for children uses a readily-available force-sensitive resistor (FSR) and an NE555 timer IC. Resistance of the FSR varies with the amount...

ESP32 (Non-Standard) GPS Receiver

Introduction GNSS – GG-1802 ($5 a piece) Sometimes things do not fall in place and we curse ourselves for taking the wrong turn or making the...

10-Watt Audio Amplifier Using LM1875

Here is a simple 10-watt audio amplifier using IC LM1875. The IC has five pins and can deliver a maximum of 18-watt output power...

Accidental Switch On And Switch Off Protection Using Delay

The accidental pressing of the on/off switch due to human error may cause the failure of the system it is connected to, or cause...

Low-Cost Ambient-Light-Controlled LED Night Lamp

This LED Night Lamp uses a 1.5W LED module operated on a 12V DC power supply. Here, an L14F1 phototransistor works as a sensor....

Solar Tracking System

Generally, solar panels are stationary and do not follow the movement of the sun. Here is a solar tracker system that tracks the sun’s...

Portable Emergency Light Using Power Bank

This portable emergency light is based on a DC-to-DC booster module and a power bank. The emergency light is designed to provide sufficient illumination...
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