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Single-Channel Audio Amplifier

Here is a simple single-channel audio amplifier that can be made using IC LM380N. As per the datasheet, LM380N delivers an output of 2.5...

Milliamp Meter For 1mA To 100mA

Low-current measurements are generally not reliable due to resolution of the measurement devices, which are mainly meant for measuring a current of a few...

RFID Contactless Lock

When it comes to security, RFID card-based digital locks are more reliable than key-based mechanical locks since they cannot be easily broken also they...

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...
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