College Diaries: 31st October 2014 – Run for Unity – Shift Register – French Test

Hey there!

Welcome to my second post in the category ‘My College Diaries’.

In case you don’t know what I am talking about; It’s a series of blogs in which I describe my day at my college ‘Acharya Naredra Dev College-DU’.

I had to get up early today as there was a Run for Unity Marathon in the College today. It was organized to celebrate the birthday of our freedom fighter: Sardar Vallabh Bhai Patel. Prepared my Break Fast and in a hurry ad started revising my notes for my French Test. (Quick Note: I am a Physics Major but am also learning French as an add-on course.) The Marathon started at 9 am and it was really fun. I had a great time with my friends. Here are some of the pictures that I took with my friends.

2014 run for unity andc pics
My batchmates and I posing for a Group Photo on Run For Unity Event at ANDC

After the Marathon it was time for my ‘Optics class’, which I decided to skip, and it turned out to be a really bad idea in the end, as my professor, Dr. Ranjeet Singh, chose today to teach us the Fresnel and Kirchoffs Integral Theorem’. Well what’s done is done. Besides I was really tired after the hectic week and also utilized the time to prepare for the test that was scheduled later on.

At 12.25 pm, I had my Digital systems Lab. This Lab is my favourite as I really like computers ad Digital electroics and it comes easy to me, so I don’t have to give it any special effort. Anyhow, this semester we had to do 8 experiments from a list of 12 and I had already completed 9 of them by last week. We built circuits like – Adder circuits(2,3,4 bits) Subtractor Circuits(2,3,4 bits), Flip-Flops(SR, JK, D), and all other cool stuff. Here are some of the experiments that I recorded. Please ignore some minor mistakes.

Well, today I decided to make a ’Shift Register’, in which we can input ad access data serially/parallel. I decided that to use the D-flip flops. The IC I used was 7474/74LS74. It has a pin for D(input) and active low ‘Clear and Presets’. The IC has two D-FFs in all. So I needed just two ICs two create a 4-bit register. For those who have no idea what I just said: Basically I was building a 4-bit memory. So if you entered a no. between 0-16, it could store it.

But sadly, I couldn’t make it work. Though there was nothing wrong with the circuit diagram, I couldn’t figure out the mistake. The problem was that the whole set of the flip-flops which should have been working as a ‘Shift Register’, was still working as a simple D-type FF. LOL! I must be the only person in the world to create a D-FF with 4 D-Flip Flops.(HAHA at me).

After that I was all set for my French Test finally. It was a piece of cake. I managed to finish it in no time.

Well that’s all for today.
See you in the next blog.


PhD researcher at Friedrich-Schiller University Jena, Germany. I'm a physicist specializing in computational material science. I write efficient codes for simulating light-matter interactions at atomic scales. I like to develop Physics, DFT and Machine Learning related apps and softwares from time to time. Can code in most of the popular languages. Like to share my knowledge in Physics and applications using this Blog and a YouTube channel.
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