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Inside a $10 phone

Updated - October 29, 2016 by Arup

Last week I bought a cheap china phone as my primary phone went to service center for 3 days. It's this: http://icellmobiles.com/product_detail.php?&getID=133 I got the phone for Rs.500 (~US$8.4) including […]

Filed Under: Gadgets

Happy New year & Intro:BuyCircuitsOnline

Updated - May 25, 2017 by Arup

We wish all our readers a happy and prosperous new year. We wish to do more experiments/engineering this year. In this new year occasion, a new website is launched from […]

Filed Under: Site news

USB li-ion charger built by Jamie

Updated - October 29, 2016 by Arup

Jamie Navarro built a USB li-ion charger on breadboard. Now he is working to get it fine tuned to accurate voltage levels. He scored a free PCB for this. Wish […]

Filed Under: Site news

Failed Prototype: VAmeter v3

Updated - November 19, 2016 by Arup

Just a few days ago the PCBs for VAmeter v3 came in. VAmeter is a simple board that connects to your existing power supply and shows the volatge, current, etc. […]

Filed Under: AVR

Usb li-ion charger build

Updated - October 29, 2016 by Arup

This is the completed PCB of the USB li-ion charger circuit.

Filed Under: USB

Low voltage cutoff circuit for Inverters

Updated - October 8, 2017 by Arup

Running inverters on battery drains the battery. This decreases the battery voltage. To regulate output voltage and to make it independent(upto a certain level) we use PWM based drivers like […]

Filed Under: Inverter Tagged With: low volatge cutoff

USB li-ion charger revision

Updated - November 6, 2016 by Arup

An year ago, I've shared a circuit of USB li-ion charger based on LM358opamp. The circuit had some problems as reported by commentators that inclide wrong direction of LEDs. Features: […]

Filed Under: Battery, USB Tagged With: usb li-ion charger

Bench PSU made by ARTESYN NLP40-7629J SMPS

Updated - October 29, 2016 by Arup

Few months ago I ordered ARTESYN - NLP40-7629J - SWITCH MODE POWER SUPPLY from element14. Including shipping and taxes, it took nearly Rs. 3500 (~USD $70) to reach me. Have […]

Filed Under: Instruments Tagged With: ARTESYN, PSU

H Bridge inverter power stage with passives

Updated - October 30, 2016 by Arup

  The above circuit I got from replies from edaboard. I had created a thread there on how can I drive a 2 pin primary transformer with H bridge configuration […]

Filed Under: Inverter

OSSDAS v1

Updated - October 30, 2016 by Arup

The PCBs for OSSDAS came yesterday by post from SeeedStudio. This is the completed board. Looks like old firmware was still in the microcontroller. The board just booted up after […]

Filed Under: Solar Projects

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