LEDs are DC devices, operating from a few volts of direct current. Where power is supplied by a DC battery like mobile phone, or torch, you can easily run LEDs. […]
Simple dekstop audio amplifier by A6283 I.C
I got two creative speakers from a friend who didn’t need that. Since they are only speakers, and not with inbuilt amplifiers, it’s not possible to run those speakers from PC/mobile […]
Zero drop dusk to dawn solar charge controller by Sandeep
When you work with solar panels, you don’t just need a panel to supply power, battery to store power and lights to glow, you will always need a good charge […]
Inside a $10 phone
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: […]
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