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Electronics For You
October  2019   Issue Vol. 51  No. 10 

ARTIFICIAL INTELLIGENCE
AI And Robotics: Hype Or Reality?
Artificial intelligence (AI) is coming to a point where action, not talk, is needed. While there are fears and inflated expectations of what AI can do, much of it is hype and a far cry from what it can actually achieve today

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Make Your Own 15W Audio Amplifier
Here is a simple audio amplifier circuit based on TDA2050 IC. This amplifier can deliver an output power of around 15W for an 8-ohm load, 18W speaker with 18V DC power supply
DO-IT-YOURSELF
Make This Solid-State Relay Driver for Microcontroller
Here is a simple solid-state relay (SSR) driver circuit using a transistor. An SSR is similar in operation to a traditional electromagnetic relay with movable/physical contacts. It employs an optical semiconductor, called photocoupler, to isolate input and output signals; and switching elements such as thyristor, triac, diode and transistor. An important feature of the SSR is that it does not use switching contacts, and so there are no physical wear and tear problems
 
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Build A Filter and Polarity Guard for AC/DC Adaptors
Presented here is a simple filtering and polarity reverse protection guard for AC/DC power adaptors. Wall adaptors have many advantages because these are low-cost, have a wide range of output voltages and currents, are easily available, come with input and output cables of different fixed lengths and so on. But these have some disadvantages, too, such as high ripples, output noise, RFI/EMC and unwanted transient responses. Again, output polarity of adaptors may vary for the same type of connectors
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Flash Twenty LEDs Using Arduino
Presented here is the circuit that drives twenty LEDs in a random manner. LED flashers and sequencers are used in decorative lights to give pretty colour combinations by glowing LEDs in random or sequential manner. This flasher has a chip that controls the random flashing rate of the LEDs
Download source code
 
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Control Four Appliances with a Touch Switch Panel
This project is based on a capacitive touch sensor for controlling four electrical appliances. Toggle switches have been used for operating lights or fans, and momentary press switches for operating electric doorbells. Most of these switches are mechanical and susceptible to damage through dirt, moisture or mishandling
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Develop a Smart Android App for Temperature Alert System
This project presents an Android app to generate an alert (alarm) on a smartphone when temperature of the process under consideration exceeds user-defined maximum temperature
Download source code
 
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Simulate MOSFET-Based Ideal Diode
A simple explanation for the working of an ideal diode circuit based on P-channel MOSFET and PNP transistor is presented here. Typical voltage required to turn on a diode is forward voltage. An ideal diode should have zero forward voltage but, unfortunately, there is no such thing as an ideal diode
Download source code