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Our School Team With The Championship Trophy My number 13 is not unlucky for me The Interschool Champion Team Yesterday (29th September 2016), our school team became champion of the Interschool Football (Soccer) Tournament, beating Aga Khan School in the final. I am one of the proud members of our team and am very happy having won our school the first Senior Championship in four years. But, behind this happiness, there is bitterness, sorrow and dissatisfaction. Our school has three football fields. However, the authority does not want us to play too much and does not allow us to play much. There are not many school tournaments to play in either. The school authority wants us to indulge our efforts in studies only and does not want us to play much. So, there is not much practice in school. The sector in which my house is located, has become, like most of Dhaka, a concrete jungle. There is not a single playground in the entire sector. So, to play or practice properly, I had to go to a di

Hello every one, Today, Electel has a new banner. Let celebrate a party hehe Electel Electronics and Telecommunications Banner

Some of the unsuccessful circuits in the early stage of SMPS learning During the last five years of my venture in SMPS circuits, I had failed many hundred times trying to design successful SMPS circuits. Since I am not institutionally trained, most of my circuits were based on test and trial, taking help from books, internet, forums, application notes, datasheets, etc. Hundreds of hours of failure could not deter me from relentless pursuit to learn - rather, taking lessons from these failures, I moved forward. Now, I am somewhat confident that I learnt a little bit of SMPS and can venture in SMPS circuits confidently.

Here are a few of the SMPS circuits I made, employing flyback, push-pull, half-bridge and full-bridge topologies. _________________________________________________________________________________________________________________________  Test setup on verroboard of half-bridge SMPS circuit with SG3525 and IR2110 for battery charging. See description below. This is the verroboard prototype of the circuit built on PCB below. _________________________________________________________________________________________________________________________ Offline Half-bridge converter Input: 160 to 240V AC 50/60Hz Output: 14.5v 10A (max) Final test circuit (on PCB) for battery charging. Successful. To be incorporated in SMPS inverter with charger. The primary side PWM is controlled by SG3525 PWM chip. Frequency of operation is around 50kHz. The output signals of the SG3525 are fed into a IR2110 high-low side driver which drives the 2 MOSFETs (IRF840) configured for half-bridge topology. ETD39

                                  SOLAR CHARGE CONTROLLERS   Circuit 1  - On/Off                                                                                   Circuit 2 - PWM                                                         Circuit 3 - MPPT   While working at Nice Electrical and Electronics Industries Limited as part-time researcher and circuit developer, I have designed Solar Charge Controllers of different capacity (15A to 50A). The charge controller is controlled by a 16F690 PIC microcontroller. The microcontroller first senses the input voltage from the solar panel. If the voltage is above 12.6V and below 19V, charging takes place. Circuits 1, 2 and 3 share similar hardware but the control methodology is different. The MOSFET is configured as a high-side switch. A charge-pump circuit is set up that boosts the input voltage to a voltage between 24V and 36V (depending on input voltage). The microcontroller provides the PWM signal to the boost stage. The boosted voltage

LCR METER with PIC16F88    In SMPS circuits, it is necessary to know the inductance of the inductors and transformer windings. However, it is not possible to know the inductance without the use of a meter for measuring inductance (eg LCR meter). In earlier stage of my venture in SMPS circuit design, I could not procure an LCR meter for use. So, I made one using 16F88 PIC microcontroller for my own use, taking help from internet. It has been made sometime in 2008. I still use it. ______________________________________________________________________________________________________________________________ PICKIT2 Clone   Circuit 1  Circuit 2                       When I was in class six, my father introduced me to PIC microcontrollers and gave me a programmer. After one year, the programmer got damaged. I failed to procure a new one as programmers available here were expensive universal ones - programmers for PIC only were not available. So, I made programmers for myself, taking help fro

My blog has now just crossed 200,000 views! I am extremely happy that it’s gotten this many views and that I’ve been able to reach out to so many people from all across the world. I love writing tutorials and articles about microcontrollers, power electronics, SMPS and everything electronics! I love it even more when my writing reaches out to people from all over the world to help them learn something new or to find the solution to some problem! So, I say thank you to all my readers and followers and hope that I have been able to help you and that I can continue helping you! If you have any topic in mind that you want me to write about, please mention that in the comments. While I cannot promise you that I will write up on it, I will certainly try. University has started (if you’re wondering why the title says Ithaca, that’s because Cornell University is located in Ithaca, New York, USA) and it’s been a month. The work load is quite high, so I may take quite a while to write some new