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MAGIC of knowledge

  • Author Tahmid
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  • Blog entry read time 2 min read
I turned the switch on and BOOM! That noise, the tiny puff of smoke and the accompanying smell had become far too familiar.

I looked on in confusion at all the failed electronics components in front of me. I needed answers. Why did the H-bridge circuit not work as “claimed”? Books showed numerous such circuits. The Internet was not short of designs either. They were all similar though. I had done my research. I thought I understood the principles and modalities of operation. Then, where did the fault lie? Frustration was creeping in. But I just had to find the fault and fix it.

I wanted to make the SMPS based inverter because I could learn so much in a field completely new to me and then use the inverter at home during power cuts. In that one night of experimentation, I had failed repeatedly, damaging 24 IR2110’s and a lot more components. I had applied all I had learned thus far. Success, however, eluded me.

After repeated failures, I posted my problem on online electronics forums. Numerous members from around the world, engineers and non-engineers alike, joined in to contribute. I learnt and questioned. Heated discussions, arguments and counter-arguments took place. And I absorbed all I could. I did not get a direct solution to my problem but I felt I had become richer and perhaps, through discussion, helped make others richer.

I spent hours reading documents and application notes, analyzing existing designs and testing the different concepts experimentally. However, the result was the same.

One day I stumbled upon a circuit on the internet, which had a different type of MOSFET gate protection, which employed a resistor between “gate” and “source”. Theoretically this resistor was not required. I redesigned the entire circuit with these resistors connected.

MAGIC! I got the required AC output. No BOOM, no smoke, no smell! 4 resistors (one between gate and source of each MOSFET) that, in total, cost less than $0.25, had been the difference! This was the magic of knowledge – the power of knowledge people refer to.

I then resorted to books and the Internet and learnt why the gate-to-source resistor stopped the MOSFET, and in turn the driver IR2110, from “blowing”.

Many people later posted on regarding problems where the MOSFET and driver “blew”. I suggested the use of the “gate-to-source” resistor and this had been the solution to many such problems.

My repeated failures had frustrated me, but also pushed me beyond the boundary of books to learn, acquire and share knowledge, to believe in the power of knowledge but most importantly to believe in myself and my capabilities. This belief and these teachings helped me in later endeavors to overcome obstacles in my way and achieve success.


This had happened in 2009 during the initial stage of my SMPS learning and designing. After this, I have not had any problems with high-low side drivers.


very good i m inspired from knowledge and experience and i wish i could have it too.
but i know it will take lot of time and hardworking..

wel done brother
source to gate is really good experience learn from make sinewave inverter ..i also have facing this problem..but no always burn ...if connected my output AC + and - wrong will be burn my IR2101 and MOSFET ...i use IR2101 not the IR2110 ..different a bit .. but burn 20++ ir2101 i also facing.this problem.. i also Frustration last time , feel very down ..for doing high voltage project .
Few things..make master..But that few things not get easier....Ur..good tahmid..i read ur blogs are really awesome...
hi tahmid
pls i know you re experienced in the field of transformer, pls i want to design aa buck boost transformer,what i want to know, are buck boost transformer primary and secondary winding wire gauge same size? that is in terms of power/voltage=arms of N1/N2 .
Hai thamid,
The CCS compiler is only for those who want to blink led's....(CCS GUYS DON'T KNOW THE MOTOR CONTROL PWM TILL.)

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