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Electronics For You
April  2020   Issue Vol. 52  No. 4 

HEALTHCARE
How Hybrid Approach Can Enhance Quality Of Ultrasonic Images
Ultrasonic imaging is simple and cost-effective, especially for use in remote places, but it is not as good as CT or MRI imaging. However, with each passing day, and with technology getting better and better, software-based ultrasonic imaging systems are becoming better too. It is just a matter of time before these start replacing CT and MRI, according to the authors

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Build A Universal AC/DC Booster, Audio Amplifier Cum Line Driver
A universal AC/DC booster, audio amplifier and line driver can be used in sensor circuits, audio signal generators, electrical guitars and so on. Most of these applications need high input impedance (for example, 10-mega-ohm), low quiescent current, output current limiting function, low total harmonic distortion (THD) and intermodulation distortion (IMD), and are capable of driving loads as low as 32-ohm, like headphones and high-impedance loudspeakers
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Make Your Own Password Locker
A password locker usually has an electromagnetic lock that opens only when the correct password is entered. The circuit presented here for such a locker is a simple, low-cost, hi-security six-digit password-operated system. ATtiny2313 microcontroller (MCU) used in the circuit is easily available and programmable using any AVR programmer
Download source code
 
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Measure Difficult Angles With This Digital Protractor
Digital compass and protractor are two of the most basic tools for specifying directions and measuring angles. But sometimes it is difficult to get accurate angle measurement for certain structures and geometrical shapes using these traditional tools, for example, the angle between two adjacent walls
Download source code
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Try Making This TFT-Based GPS Analogue Clock Using Arduino
This GPS-based project displays analogue clock and room temperature on a TFT display. GPS time is a precise time standard that is related to Coordinated Universal Time (UTC). The displays of most electronic hobby projects are based on LCD, GLCD, OLED or TFT. This project is based on an 8.89cm (3.5-inch) TFT display having 480360 pixel resolution
Download source code
 
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Make A Crystal-Locked FM Transmitter
The circuit presented here uses a crystal oscillator and frequency multiplier to generate a highly-stable carrier signal frequency of 96MHz. With 40mW of RF output, it can be used to transmit voice or music up to hundred metres
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Design Your Own Digital Photo Frame
This digital photo frame is designed using Arduino Uno. Smartphones with high-resolution cameras and enhanced features have motivated people to click photos of almost everything that they come across. It is not possible to frame all photos on a wall and, hence, the digital photo frame was invented in the 1990s, which would accept memory cards directly from digital cameras and display photos on the screen
Download source code
 
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This Stereo Amplifier Is Simple To Make
Here is a simple stereo amplifier you can make with a CD6283 audio amplifier and a few passive components. It provides an output of 4.6 watts per channel with a 12V power supply