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Projects published below, have NOT been tested at Electronics For You Labs. But, that does not mean that they don’t work.

We invite YOU to try and test them, and share your feedback and suggestions for improvements.

We will be happy to recognise the good ones via Certificate of Recognition and a Surprise Gift, on a weekly basis….

Dual Bridge Driver On Expansion Module With L293P For Arduino

The short article describes simple but useful four-channel driver expansion module with L293P for Arduino. The board can be called power shield, motor shield...

Low-Cost PWM Module For Arduino Or Development Kit With MCU

This short article describes a simple circuit capable to convert a TTL/CMOS PMW signal to an analog signal. The circuit can be used as...

Digital Satellite Finder

This article describes a satellite finder that we can build ourselves to assist with aligning the satellite TV dish without having to take our...

Wristband Based GPS Navigation System

GPS and sensor technologies have been evolved over the past decade in the global market of transport and navigation. These technologies lead the world...

Micro-Solder Pot

To make a great solder joint, component preparation is a must. This sounds unimportant, but it is very important to clean the component leads,...

Low-Cost Universal Dual Channel Audio Checking And Troubleshooting Tool

Frequently, we are in need to do audio troubleshooting of electrical and electronic components, installations and equipment. E.g. we may need to check, test and evaluate: ...

Measuring The Charging And The Discharging Current Of The Battery

When we work with rechargeable battery it is useful to have the following functions: measuring the charging current, measuring the discharging current, measuring voltage...

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...

Wi-Fi Controlled Robot Using Arduino UNO And Blynk

This Wi-Fi controlled robot can be controlled from anywhere using the ARMA IoT shield for UNO and the Blynk App which provides the user...

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...

Dual Universal Hardware Driver for Embedded Systems

Introduction The embedded systems should drive different peripheral devices requiring significant electrical power. A typical case is the DC motors, operating from 6V, 12V and 24V. These...

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...

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....
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