Touchless Doorbell For The Post-Covid World
This low-cost, simple, reliable, and effective circuit for a doorbell works without touching.
It can be quite useful in our post-Covid-19 world as it minimises...
Simple Shortwave Voice Transmitter
This simple shortwave transmitter is easy to construct and can be used to transmit speech on the lower shortwave (SW) band of 5MHz to...
Arduino-Based Compact DIY TDS Meter
Total Dissolved Solids (TDS) is a measurement for detecting the potability of water. Both humans and aquatic creatures require a suitable level of water...
Tricolour LED Nameplate With Arduino
Nameplates are generally made of wood, acrylic sheet, or a metal and fixed on a wall or kept on desk. The author’s prototype of...
Android Application For Multi-Sensor Data Monitoring
This Android-based project can monitor on-site (field) process data sensed by two temperature sensors and display the temperature (in degree centigrade) on a smartphone....
Little LiFePO4 Battery Charger
This circuit of single-cell LiFePO4 (lithium iron phosphate) battery charger is based on an LM358 operational amplifier (op-amp) and a couple of inexpensive and...
Stereo AF Amplifier Using TDA1517
Here is a simple stereo audio amplifier that can be made using a TDA1517 IC. A 14.4V regulated voltage is used as power supply...
Power Bank Based Linear Regulated DC Power Supply
This circuit uses power bank and DC-DC booster module not only for charging mobile devices but also to provide 1.2V to 37V DC power...
Rotating-Wheel LED Lights For Decoration At Functions
This circuit produces a rotating-wheel like LED lights pattern, which can be used to decorate public halls during parties, festivals, and marriage functions. The...
Simple 5W Stereo Amplifier For Noise-Free Music
This simple stereo audio amplifier is based on a 12-pin TA8207K IC, which is inexpensive and easily available. In addition, it requires only a...
5V DC To 48V DC Converter For Phantom Power Supplies
This circuit provides a straightforward and cost-effective solution to provide 48V DC for phantom power settings such as those found in mixers, mic preamps,...
NeoPixel Colour-Changing LED Lighting Using Arduino
This NeoPixel LED lighting based on WS2811 driver and Arduino digitally produces red, green, and blue (RGB) lights and the combinations. Originally introduced by...
Smartphone Based Liquid Level Monitoring System
Measurement of liquid level in process tanks for monitoring and/or controlling is essential in process industries. In process plants, tanks contain various liquids that...
6W+6W Stereo Amplifier Using LA4440
Here is a simple project of a 6W+6W stereo amplifier using a 14-pin LA4440 IC. This amplifier can deliver an output power of 6W...
LED Emergency Light Cum Power Bank Plus Mini Fan Driver
This simple circuit can be used as an LED emergency light, a power bank for charging mobile phones, and as on-the-go (OTG) USB DC...
Automatic Water Dispenser
A branded automatic water dispenser is usually expensive. So, a relatively low-cost do-it-yourself solution is presented here. It is a portable general-purpose automatic water...
DIY: Low Noise Power Supply With Four ICs In Parallel
This article presents a low-noise power supply with four 78L15 voltage regulators in parallel, giving about 15V DC output. The modern environment has become...
Smart 230V AC Bulb Holder
The smart 230V AC bulb holder introduced here is an ultra-simple device with an automatic electric bulb controller switch and a standard electric bulb...