SElabs tech blog

SAMSUNG GALAXY NOTE  - ফুতি জুইলাগিছিল .... এতিয়া আইফন ৮ (latest iphone 8)  কেনেকে? ৭ দিন হোৱা আইফন কেইটা বেতেৰী ফুলি কেচ খোল খাইছে ...  টকা গল পানীত ? সময় কব  বেতৰী ফুলা ২ টা কাৰন  হ'ব পাৰে  -- বেতেৰী দিফেক্ট বা চাৰ্জাৰৰ ইলেক্ট্ৰনিক প্ৰব্লেম   বেতেৰী ফুলি বিস্ফোৰনও হব পাৰে  NEWS link :  https://www.macobserver.com/news/iphone-8-plus-battery-swelling/

squelch detection circuit : making walkie takies .. it will mute the hiss sound and allow only clean audio when recieved ধৰক ৱাকি তকি এতা বনাই গাৰ্ল ফ্ৰেনক দিলে অন কৰাৰ লগে লগে চৰচাৰাই নইজ আহিল তেনে হলে তো নহব , প্ৰিয়জনৰ মাত সাৰৰ বাহিৰে বাকী নইজ (no transmission)কাতি দিব এই চাৰকিতে A nice walkie : https://www.youtube.com/watch?v=y08ygGQronM author  dint gave circuit ------ Engineer Fresher jobs Job title :  Manufacturing Engineer I New College Graduate - (E1)-1704901 Company :Applied materials http://www.appliedmaterials.com/ Description : Manufacturing Engineer I New College Graduate - (E1)-1704901 Apply email :  info_india@amat.com Java IVR Developer Job title : Manufacturing Engineer I New College Graduate - (E1)-1704901 Company:Infosys India Software Description : • Bachelor’s degree or foreign equivalent required from an accredited institution. Will also consider three years of progressive experience in the specialty in lieu o...

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 ! 

Vivo V7  Vivo Electronics Corp. is a phone brand based in Dongguan, Guangdong, China. It was founded in 2009. The company is another Chinese smartphone maker but this one spends more on dealer commission and IPL  To make the markets flooded with choices , they sale too many models .  Do you know vivo and OPPO are same cell companies .  Avid indian buyer  gets confused .  Vivo  tries to copy flagship product samsung/xiaomi  but it fails there are lots of segments  But to market the  vivo guys have many many  online comparision of OPPO Vs VIVO  1. Snapdragon 635 which heat phone very fast 2. Still screen resolution is low 3. Ram is low 4. No direct video call 5. Battery capacity low for that price  6. Camera focal lens is poor 7. Camera pics are over processed in software , look unnatural

Cell phones are many the  screen is one constraint that has not been addressed . The flip phones has  dual screen but all hated the begels . The flex OLEDS ::  As the availability of consumer OLED-display products continues to expand, so have research efforts in future trends of the low-power, light-weight, and superior-viewing-enabled OLED technology. Bendable, rugged, and eventu-ally roll-out flexible OLED (FOLED) displays are actively being developed by numerous university and industry groups, taking advantage of the demonstrated flexibility of both small moleculel and polymer2 OLEDs. The key chal-lenges to be overcome for the realization of flexible active-matrix OLED (AMOLED) displays can be classified into three main categories: substrate/backplane development, OLED development, and OLED display lifetime. Substrate and backplane development are interrelated in that the backplane technology chosen will depend on the limitations (thermal, chemical, etc.) of the fl...

We at SELABs yet at proto stage , some protos have  been finalized but leaving the circuit naked and casing are two things .  The casing is 30% extra task .  Remember projects without box gets damaged or lost .  You are an Engineer not a craftman so dont go buying all tools , dremels needed but cost Rs 4000 to 8000. For starters they are not a must .  To make the DIY enclosure for circuits you will need Fasteners : 3 sizes 3mm//4mm length screw and nut pars : Buy a lot  Drill and file and hecksaw : these are tools of trade . drill are there in tolexo dot com for 600Rs Round and flat file needed too .   A cheapo soldering to melt away plastic, A nail file to heat and cut plastic   Acrylic cutters : in case making from acrylic , I recommend a acrylic cutter 100RS or so in amazon    Needed knobs and sockets to be bought in aliexpress , it is the  better way    dc sockets : 20Nos  ...

Every one wants a thin TV , so tvs getting thinner .  Can it be bodyless , just a paper sticker yet perform very well .   Not the LG guys gone insane 4K in just 2.5MM . Whooah .   makes me think it can be as sensitive as a flex glass .

মোৰ গেমিঙ চিচতেম Can you use android as gaming system in 2017? Ans . yes , the new mobile GPUs are reaching a great level i terms of power .The new 3d games look much better in monitor and installation is easy . Our advice get this gear :    A Stunning HD monitor 19inch is fine     A compatible controller ( we recommend DRagon war controller )     USB OTG HDMI  cable   Getting a good gaming mobile , the price bracket has fallen , you just need < Rs 15,000/-   Here is a list of nice HD gamer cell phones Adreno 506 Moto G5 Plus :   Mi A1 :     Xiaomi Redmi Note 4 Adreno 530 Lenovo Z2 Plus:   Honor 8 Lite:   Adreno 505 LG Q6  buy OTG VGA cable 599Rs  AMAZON/FLIPKART  buy 24inch BEnQ LED Full HD  monitor  http://amzn.to/2xxeobK Dragon war controller :AMAZON The game controller is very high quality...

# makeinAssam ৫০বছৰে সেই বাছ conductorক খুচুৰা দিয়া কাম চলিছে .... বাচ পেমেন্ত চিচিতেমবোৰ বনাওতে খৰচ হয় বাবে নবনায়... ফলত টেকনকজী ব্যৱহাৰ নহয় পুৰনী কলিয়া চিচতেমেৰেই চলিচে হেচ থেলা খাই , কেচ লেচ হলে কেনে হয় ? The Revolutionary MakeinAxom IDEA::  পুৱা প্ৰিপেইদ কাৰ্দ ললে (50/-)বাচ স্তপত .. বাচ সোমাওতে কত যাব সেই জেগাৰ টকা বুতাম প্ৰেচ কৰিলে ধৰক ভাড়া ৬টকা ... তাত তেপ কৰক মানে কাৰ্দ চুই দিয়ক /ওপৰেৰে লৈ যাওক .. বিপ কৰিব মানে টকা কাতিলে আন ভাড়া বাবে কন্দাক্তৰে ৰিমতেৰে ভাৰা চিলেক্ত কৰি দিলে ৮টকা / ১২ টকা /১৫টকা কেচ লেচ কৰা সকলক অফাৰ ও দিলে ১৫০/- ললে ৩টা ভাড়া ফ্ৰি সন্দিয়া দৰকাৰ পৰিলে , বাচ স্তপত গৈ বাকী ৰোৱা ধন ঘুৰালে বা কাৰ্দতে ৰাখিলে The  fraud  security :: preventing misuse.. checker in buses : ভুল ভাড়া দি বেছি দুৰ যোৱা সকলৰ কাৰ্দ চেকাৰে চেক কৰিব যত তত ... ধৰা পৰিলে ২০০০ফাইন Why this is so cheap system  yet very very useful: আৰদুইন হৈছে প্ৰচেচৰ বৰ্ড যত সকলো সহজে বনাব পাৰি . .BAREBOAR ARDUINO বনালে ১২০/-মানতে কৰি লব পাৰে ... ইয়াৰে মেই ৰিদাৰ বনাইছোঁ... ...

Here is  a cellphone that  harvests the  ambient energy . What is the Ambient energy? We have a blanket of RF energy surrounded by so many cell towers Harvesting energy from the environment,is the way to go for future cellphones  But the cell phones cant be created just by an antenna and signals from it , researchers at University of Washington have their own way to  do that digital communication . “We’ve built what we believe is the first functioning cellphone that consumes almost zero power,” said co-author  Shyam Gollakota Converting analog signals that to have corresponding  data that a phone can understand consumes so much energy that it’s been impossible to design a phone that can rely on ambient power sources. They have developed a special way that   takes advantage of tiny vibrations in a phone’s microphone or speaker that occur when a person is talking into a phone. To transmit speech, the phone uses vi...

    Our country is amazing  , one way moon mission , smart phones   on the other side there are billions are using  age old kerosene lamps .   Have you ever thought why  ? The Chinese lights have not  been able to replace the traditional lamp .The vendors taking china lamp are eating poor people's money . Considering to the fact that engineers only want to work in big companies no one tries to reach the poor the main problem a usable light .There are solar light but no one is reliable , of lower cost . #makeinAssam #diy #gaming #electronics There are main problems in making a nice chargeable lamp .The lead battery lasts just 150 cycle and the case is another big cost incurred by the poor .   We at SELABS have developed the bulb that takes USB or small solar and has a life of 4 years    On top cost is too low . Syska etc are seiing such bulb in 600Rs(GST RATE included)  , they charge via mai...

#makeinAssam #diy #gaming #electronics

Why suddenly two cameras ?  Smartphone cameras are improving  slowly nowadays, I will say not as fast as the marketing pic shown   however they are bound to follow  hard physical limits . We all are aware of style conscious customers they will not go for thick phone . Modern cells have  constraints of  camera area a device that’s 7mm thick, and phone companies are looking for alternative means to keep improving.  Approx in june 2016, LG and Huawei have led the new dual camera technology  new Android flagships , may be apple was buzy perfecting .  === দুটা কেমেৰা কিয় ?    কাৰন ফনৰ ৭মিমি জেগাত হাই প্ৰফাইল লেনচ চিচতেম , better sensor দিব নোৱাৰি    ।তাৰ বাবেই দুৱেল কেমেৰাৰে বহুগুন   উন্নত ইমাজ দিব পাৰিছে ।   এই দুইকেমেৰাই দিয়া ইমেজক Hardware processingত একলগ কৰি...

মোবাইলত ২০০০০/- বা তাতকে কমৰ ধন  দিছে   ,বেয়া নহবলে সকলো উপায় / সাৱধানতা লৈহে এৰিব ।  গোটেই ৰাতি লগাই ৰাখিলে কিবা বেয়া হব ?  সকলোৱে মবাইল লৈছে কিন্তু তাৰে কোনো কোনো মেনুৱেল বা আনটো   কৈ দিয়া নাথাকে  সেই এক বিষয় চাৰ্জিং  বহুতেই ভাৱে জুই লাগিব পাৰে :  Block diagram  চালে দেখিব বেতেৰী চিচতেমত নান  অংশ তাৰে মেইন হৈছে   Battery temperature detector  কিবা কাৰনত বেতেৰী হিত হৈ পৰিলে ,  ই ৰক্ষা কৰে  #makeinAssam #diy #gaming #electronics বেতেৰী বেয়া হব নেকি ?   - ডায়েগ্ৰামত power management voltage control system  দেখিছে ই ফুল হলেই কাত কৰি  ৰাখে তাৰ বাবে আশংকা...

কলেজৰ প্ৰজেক্ত কৰোতে ডাস্টবিনত পেলোৱা ধৰনৰ নকৰি ...  জৰুৰি কিবা সমাধান কৰিবলৈ কৰিব লাগে । Problem: আমি প্ৰায়ে দেখো বৰষুন আহিলেই পাৱাৰ কাত কৰে  ।  ... তাৰ পিছত ২-৩-৩০বাৰ অন অফ কৰি চায় জন সমুহ থিকে আছেনে .... গ্ৰাহকৰ হাঁহ নচৰা অৱস্থা বাৰে বাৰে কাৰেন্ট কাতে   । Can we avoid that 1920 age system with electronics? yes.. a new concept zonal check sensors কৰবাত লাইন ফল্টআছে নেকি প্ৰতিচেনচৰে চেল check কৰিব অাৰু মেইন চেন্টাৰলে দাতা দিব ইলেক্ত্ৰিকেল তাৰেৰেই মেইন চেন্টাৰে দাতা বিচাৰি চিগনেল দিব কথা হল এনে চিচতেমৰ চেনচৰে পাৱাৰ কৰ পৰা লব ... ছলাৰ আদিৰ উপৰি ছুপাৰ কেপাচিতৰ বেংক লাগিব পাৰে with 160hour backup.super cap can charge morethan 1.5lakh time so endless life সকলো জ'নত এক স্মাৰ্ত চেনচৰ বক্চ লগাব ... ই নানা প্ৰকাৰে মেইন পাৱাৰ নোহোৱাকেই চেক কৰি চেন্ত্ৰেল অফিচত কব ... ইলেক্ত্ৰিকেল বিভাগ বাইক লৈ ৰাউন্দ মাৰা দৰকাৰ নাই। কত ফেইল হৈছে গমেই পাব How to make ZONAL SENSOR ? Arduino UNO based current sens...

মবাইলৰ বেতেৰিত ১০০০মিলি এম্প পাৱাৰ থাকে ! কিবাকে বাহিৰত চাৰজ কৰিলে ৰবাটেই হওঁক বা নানা চাৰকিতৰ পাৱাৰ দিব পাৰি  চাৰকিত হৈvoltage protected chargerছে চাৰ্কিত You can use USB 5v  charger , but there is danger of exlosion, as the output of these devices is not tightly regulated to 5v. If you carefully measure and observe the output, you can see it going to 6v or more. So, I think you could use a zener-transistor circuit like this for your purpose.Adapting to 5v solar panel is  super easy . Just use the  panel in place of the Adapter USB wires !  This is too low cot circuit and the usability  is huge  In case you are trip to village where no power , make a tincan  box fitt the solar and circuit , youhave powerbank on the go !   #makeinAssam #diy #gaming #electronics

ছলাৰ ছেনিতেচন বৰ দৰকাৰী : Swachh Bhar at   Mission   ত সকলোতকে দৰকা ৰ Auto clean Toiletৰ আছিল  নকৰিলে , অসমৰে ডেকা সকলে বনাই দেখাব পাৰে ছোন !    এই পষ্টত নিজে ডিজাইন কৰা   ৩ মটৰ চিচতেম তোক বনাব সৰল , ই পাৰফেক্ত কাম কৰে .. পেনেল সকলো অনলাইনৰ ছপতে পায় ।  বজাৰৰ চিচতেম বোৰ বৰ দামী .. This a makeInaxom project . The system  will use 1)compact  3 dc motor as PUMP with ir sensor modules 2)800Rs solar panel 3)joule thief LED cost of devlopment <3000Rs সচ্চ ভাৰতৰ মিচনত এই চিচতেম লগাইদিলে বহুত ৰাইজ সেই দুৰ্গন্ধময় PUBLIC TOILET ৰ পৰা হাত সাৰিব how does it wrk ই কি কৰে M3 য়ে তেংক ফুল কৰে বাকেতৰ পৰা .... তে্ংকৰ পৰা কন মান পাম্পএ ভাল্বৰ দৰে কাম কৰি পানী ধালে .... কেইতা চেনচৰ IR based ত্ৰিগাৰ হয় each pump switch on for 20seconds

 Here we are starting  innovation revolution  in assam !   Innovation always relates to small small know how that add up to impact milllion times .   Can we make a solar security system, that runs forever ?   yes we can , but most systems need a 'battery replacement'   and  we always have to change battery after 200cycle   also many systems need wiring ! who wants to wire up house with 6 pairs of wire for 6sensors  So most viable item for a lifetime charge discharge is super capacitor . As name suuggested the supercaps are huge capacity capacitors like 1000times more but have same size as normal caps .   The circuit   Circuit ::   Its a current limited SOLAr circuit ? the 15ohm 1watter is a limiter like 180mA current   other wise circuit make dead short if the supercap is there  , that way the solar panel do not  burn out .   A ...