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 […]
Happy New year & Intro:BuyCircuitsOnline
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 […]
USB li-ion charger built by Jamie
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 […]
Failed Prototype: VAmeter v3
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. […]
Usb li-ion charger build
This is the completed PCB of the USB li-ion charger circuit.
Low voltage cutoff circuit for Inverters
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 […]
USB li-ion charger revision
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: […]
Bench PSU made by ARTESYN NLP40-7629J SMPS
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 […]
H Bridge inverter power stage with passives
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 […]
OSSDAS v1
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 […]
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