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Multi Channel Hardware Driver for Embedded Systems

The real world embedded systems are controlling DC motors, stepper motors, electromagnetic relays, incandescent lamps, powerful LEDs, displays, inductors, transformers, long cables, etc. On the...

Simple Universal AC Or DC Amplifier with OPA452/OPA453 And Transistors

Introduction During the experiments with loudspeakers, systems with loudspeakers, transformers, public announcement systems, audio distribution lines and amplifies, etc, we are in need of audio...

Solar Powered Home Lighting System

This project suggests a solar powered home lighting system that uses solar power and LED lighting technology in a more efficient way. Solar power...

Smart Solar Charger

Solar powered lighting systems are now used in rural as well as urban areas. These systems include solar lanterns, solar home lighting systems, solar...

Time-Lapse Photography With Raspberry Pi 3

This project aims at developing a simple time-lapse photography device with Raspberry Pi 3 and Pi camera. To get the most out of nature without...

Converting the Stereo Audio Distribution Buffer into Stereo Audio Distribution Amplifier

The stereo audio distribution buffer published on page 94 of the July 2013 Edition of EFY can be converted easily into stereo audio distribution...

Low Cost High Impedance Buffers for Oscilloscopes and Voltmeters

Most of the low cost digital oscilloscopes and voltmeters have input resistance around 1 MOhm and input capacitance around 100pF. But in many case...

Bipolar Power Supply with LM317T and with LM337T Controllable with Stereo Potentiometer

LM317T and LM337T are well known and low cost adjustable voltage regulators with current limiting up to around 1.5A and power dissipation up to...

Simple Audio Power Amplifier With NE5534/А And Darlington Transistors With Up To 30W Of Output Power

These days there a lot of audio power amplifiers in integrated circuits (ICs). But it is still interesting to produce audio power amplifiers with...

Simple Low-Noise Audio Distribution Amplifier

This article describes a low-cost low noise audio distribution amplifier based on hybrid or mixed technology. Input to the amplifier is from low-noise, high-gain npn...

Multifunction Rechargeable Clock

Building clocks are one of the interesting and easiest projects that can be seen among hobbyists and makers. Presented here is a multifunction rechargeable...

Low Cost Dual Channel Active AC Analog Probe

Introduction When we are experimenting with AM receivers for LW, MW and SW we are in need of high impedance analog probe with low input...

LM1875 Based Simple Amplifier

LM1875 is a low cost and very popular and useful integrated circuit (IC). It is designed to be stable with gain higher than ten....

Transistorized Microphone Preamplifier With Band Pass Filter

Introduction The signal from most of the microphones should be amplified before to be send to the interconnection cables. In order to reduce the noise of...

Arduino Based RGB Colour Code Generator

Red, green and blue (RGB) are the basic colours for generating various other colours by mixing colours in a particular proportion. This technique is...

GPS Distance Meter

Presented here is a project based on Global Positioning System (GPS) and ATmega328P-PU microcontroller to measure the distance between two points using Haversine formula....

Raspberry Pi As World Webcam Server

While it is not possible to always keep an eye on your home or business while you are away we can make a world...

Arduino Based Programmable Digital Data Display

LCDs are widely used in applications like token-display machines in smalls and supermarkets, order number displays in restaurants and café, and so on. The...
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