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projects:Designing a cut off 12V charger with TL431

About TL431   :

The TL430, was introduced as an adjustable shunt regulator in 1976 by  Texas Instruments.

The TL431 was created as an improvement to TL430 with better accuracy and stability and was called a precision adjustable shunt regulator. The TL431 was announced as a future product in 1977 and launched in 1978
The TL431 is a three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.5 volts) and 36 volts with two external resistors These devices have a typical dynamic output impedance of 0.2Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excel lent replacement for zener diodes in many applications.
Lets use the voltage calculator tool:



Link :  http://www.electronics2000.co.uk/calc/potential-divider-calculator.php

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MakeINAxom - a revolution that will light up assam (600Rs Inverters !)

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MakeINAxom is a dream that will shine Assam and NE Region .....
এই ব্লগত  SELABS বোলা অনুস্থানতোৰ সপোনক ৰাইজলৈ নিছোঁ 
SELABS কি  , কি কৰিব বিচাৰিছে ?     SELABS organization বনাইছিলো অকলেই , ইয়াৰ আৰম্ভনিত ২-৩বছৰে ফেচবুক গ্ৰুপ   "SOHOJ ELECTRONICS TALK AXOM"  ত  ইলেক্ট্ৰনিক্সক লৈ কেনেকে প্ৰদাক্ত বনাব সেইয়া লৈ আহিছিলোঁ
--- Eng::
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you said Joule Thief?

you said Joule Thief? you said Joule Thief? 

It’s a little wisp of a circuit that allows you to drive aPOWER  LED from a low voltage. Normally, if you want to light up a blue or white LED you need to provide it with 3 – 3.5 V, like from a 3 V lithium coin cell.


But the magic of JT is  a 1.5 V battery like a AA cell simply will work. 
Easy make  Joule Thief,  works like a charm. Not only does it work with a brand new battery, but it works until the battery is nearly dead– down to 0.3 V. 

That’s well below the point where your other toys will tell you the battery is dead, so it can steal every last joule of energy from the battery (hence the name).

how about a cellphone charger , yes it is doable , we are here to give you  a usable tested diagram .


get  the ring toroid from a OLD smps of pc ! 

BITCOIN কিনি ধনী হওঁক ৩০দিনত

BITCOIN electronic 'CRYPTO'currencyসেই টকা পইচাৰ মুদ্ৰাৰ সলনি বিতকইন আহিছে .... ইয়াৰ বাবে কোনো বেংক

নাই কোনো দেশৰ চৰকাৰ কন্ত্ৰল নাই সেইবাবে ইয়াক পঠাই দিওতে  টেক্চ হিচাবত কনমানো কাত 
নাজায় ।


Why know about bitcoin ?
The digital money trade is steadily heading towards immersion in the North American and European markets. One of the significant drivers of the market has been opportunity from keeping money wallet from hidden taxes and easy to open and keep up a financial balance that is fast raising . The immature managing an account framework in Asia and African market, conversely, fundamentally higher development chances to digital money exchanging stages. While a considerable measure of digital money trade organizations done recent quarter on more immersed Western market, the push to promote bitcoins in Asia and Africa obviously after that wannacry event .
১লাখ টকা বিতকইন এবছৰ আগৰ এতিয়া ৪লাখ হৈছে

recent reports AUG -OCT : 


1bitcoin =1.81Lakh rupees (1Aug) 

370360.69 Indian Rupee(TODAY …