Junaid's Blog

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Illustration of a bird flying.
  • Create PDF from Image Files and Resize PDF to Standard Page Size

    First convert image files to PDF with command: Then resize PDF to standard size with command: Read more about pdfjam at here.

    August 28, 2019
  • SEPIC Converter Calculations For Fixed Output Voltage

    Attached document demonstrates calculations involved for a SEPIC converter. Calculations are based on “AN-1484 Designing A SEPIC Converter” by Dongbing Zhang from Texas Instruments.

    August 15, 2019
  • Electret Mic Stereo Preamplifier

    I was looking for a simple per-amplifier circuit. Found one at http://www.minidisc.org/mic_preamp/Simple%20Stereo%20Electret%20Mic%20Preamp.htm. I made minor modifications and here is my version.

    June 28, 2019
  • LED Light with CYT1000B

    LED Light with CYT1000B

    Lighting LED with AC main supply were not that easy. Mainly it required some sort of SMPS with current controlling circuitry. But it is changing. Now there are integrated circuits available specially designed to help to light LEDs with few extra components. One of such IC is CYT1000B. I like CYT1000B more compared similar ICs […]

    June 12, 2019
  • തെർമോക്കപ്പ്ൾ

    ചൂട് അളക്കാനായി ഉപയോഗിക്കുന്ന ഒരു വഴിയാണ് തെർമോക്കപ്പ്ൾ. രണ്ട് വ്യത്യസ്ത ലോഹസങ്കരങ്ങൾ ചേർത്തുണ്ടാക്കുന്ന ലളിതമായ ഒരു ലോഹക്കഷ്ണമോ ദണ്ഡോ ആണിത്. ചൂടിന്റെ അളവനുസരിച്ച് ഇത് വളരെ ചെറിയ അളവിൽ വൈദ്യുതിയുണ്ടാക്കും. അതിന്റെ വോൾട്ടേജ് നില ചൂടിന്‌ ആനുപാതികമായിരിക്കും. ഇങ്ങനെയുണ്ടാകുന്ന വോൾട്ടേജ് നില അളന്ന് അതിൽ നിന്നും ചൂട് എത്രയാണ് എന്ന് കണക്കുകൂട്ടി കണ്ടെത്താൻ കഴിയും.പക്ഷെ തെർമോക്കപ്പ്ലിന്റെ വോട്ടേജ് നില നേരിട്ട് അളക്കുന്നത് ശരിയായ രീതിയല്ല. കാരണം വളരെ ചെറിയ വോൾട്ടേജായിരിക്കും അത്. ഉദാഹരണം ഒരു K ടൈപ്പ് […]

    December 31, 2018
  • Nginx Configuration for WordPress with HTTPS Enabled

    Few days back I switched back to WordPress from static site generator Hugo. On my server I am using Nginx as web-server though I am more familiar with Apache Web Server (Now I can’t remember exactly why I switched to Nginx?!). I am using LetsEncrypt SSL certificates and always redirect regular HTTP traffic to HTTPS.

    December 24, 2018
  • Thermocouple Amplifier with OP07C Op-Amp

    Thermocouple Amplifier with OP07C Op-Amp

    Recently I created a soldering station based on Arduino Pro mini. It has to read temperature data from a thermocouple within the soldering iron. Thermocouple produces a very little voltage, around up to 30 Milli volts for soldering irons. So, the soldering station uses an op-amp based circuit to amplify those small signals from the […]

    December 24, 2018
  • Switched to Hugo

    Switched to Hugo

    I switched to Hugo as static site generator for my blog on last Sunday. I was using Stagen, a static site generator wrote myself in Node.js, from March of 2016.

    March 1, 2018
  • PWM with STM8S

    PWM is a great way to control brightness of LEDs, speed of motors, etc. Most microcontrollers including STM8S has built in ability to generate PWM signals. In this article I share simple code to generate PWM signal in STM8S microcontroller. However, I don’t write anything about PWM theory other than basic calculation to get required […]

    January 24, 2018
  • Bootloader-less Programming Arduino Pro Mini

    Recently I was creating a configurable timer circuit based Arduino Pro Mini. The circuit has a momentary push button which user can press to turn ON the device. The device will turn OFF itself once the time is elapsed. On starting, Arduino has to turn on a relay to get permanent connection to power source, […]

    January 21, 2018
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