Showing posts from August, 2014

Transmit data through body

I recently happened to work on a project that could transmit data through your body. The transmitter is at one end of the body and the receiver is at the other end. Small electrical impulses are generated by the transmitter corresponding to the inputted audio that are then transmitted through your body,as our bodies are good conductors of electricity, to the receiver.

When I had completed my project I came to know that many giant companies were also working with the same idea and that I was late. But the contentment of having done something great told me to write about the project on instructables. Today I am happy to share it on my blog.

The materials required for this project are common electronic components that one can find in some local electronic supplies store. This project mainly emphasis on the transmission of sound through the body. Its just a prototype that I built to test the theory. Lot of improvements have to be made. Receiver:

1. 3 x BC547 transistors
2. Resistors- 2 x 150 …

Physics Behind Falling Bullets

Many a times, in films, police shoot bullets up in the air to grab the attention of the people around. I used to wonder, what happens to the bullet? Well today I am writing this post to explain the same.

If we consider the height of the policeman who shoots the bullet to be negligible and also the air resistance to be very little to be considerable, then the maximum height reached by the bullet is given by
h=u²/2g where u is the initial velocity of the bullet and g is acceleration due to gravity.
At the highest point the velocity of the bullet becomes zero for a very small instant of time. The final velocity of the bullet just before hitting the ground would be
by replacing s with u²/2g we get v=u This tells us that the magnitude of velocity with which the bullet will strike the ground is equal to the magnitude of velocity of projection. The other way of proving this is the kinetic energy of the bullet will be converted into its potential energy. From the highest point, when the …

Build Your First Robot - First Robot

I had promised earlier that this post will concentrate on transistor circuits but as I have not written a blog post for long (which is my fault), in order to compensate for that, this post will be on actually building the robot. For these many days we have been discussing various basics necessary for building a robot. Today we are actually going to put them into action. Let's dive in!

Our first robot is going to be fairly simple. This robot is kind of an experiment done to see what is necessary to build a robot.

1. Breadboard
2. TIP 122 n-p-n transistor
3. 2 motors ( with a good torque)
4. 2 LDRs (Light Dependent Resistors)
5. Wires
6. 9 volt power supply

Step 1: Add the transistors
Attach the transistors to the breadboard as shown in the image. Go online and find the manufacturer's datasheet of the transistor. Generally the pin out diagram is as follows, but do check the datasheet.

Step 2: Add the LDRs
LDR is a special kind of resistor whose resistance depends u…


I always wanted to share the beauty of time with everyone. Here is a set of great videos that explain space-time in a very simple yet effective manner. A special thanks to ted-Ed for making such wonderful videos. Enjoy!