LEARNING WITH PROTOS

 

LEARNING WITH PROTOS

Being an engineer have so many times played with efficiency curves, characteristic curves, stress-strain curves etc in due increasing the retention of my knowledge every time. A few seconds ago I was just thinking why I don’t do something to let children provide an opportunity to shoot out their LEARNING CURVES!!!

In this real battle of BRAINSTORM we can let us our new generation learn technology and physical phenomenon through prototypes developed by little efforts of engineers that can provide opportunity for kids to understand scientific things and even a golden chance for engineering students to learn more by developing prototypes for different phenomenon. 

It would be my pleasure to share one of my prototypes for letting others to understand what I am trying to say. This prototype works on the simple concept of noise cancellation through superposition; so basically it’s a prototype circuit of a simple noise cancellation device.

This device uses the simple phenomena of superposition of waves that when two or more sound waves from different sources are present at the sound waves are180° out of shift, the sum of the waveforms would be zero. They would cancel out each other and ultimately there would be no sound. Basically sound is a compression wave in air so the wave first compresses to an amount greater than normal air pressure; so adding the positive and negative pressure will ultimately give you the normal air pressure.
You can develop prototype of such a simple active noise cancellation device. All you need to do is to follow the circuit as shown bellow.
In this circuit we use a step down transformer to reduce 240V to 12V. Oscillator provides us with the pure-tone (simplest periodic sound) sound which is fed to the first speaker. Oscillator is further connected to Audio-inverter like 741 operational amplifier which inverts the sound and the shift of the sound is decided by using adjuster attached with the inverter. This inverted sound is further amplified and fed to the second speaker. When we switch on the device and rotate adjuster to give a 180° shift then no sound would be heard but you can feel the vibrations by putting your finger on any of the speaker.
To teach anyone anything let that person to think and move one by CREATING CUROSITIES. If engineers unlock their minds and also work out on these miniature things then it can offer a chance for them to think and invent new things and would definitely provide an opportunity to young learners understands and things and intriguing them towards technology.