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. But running LEDs by AC requires a driver. Appropriate LED driver is required for the LED to last longer. While LED itself costs less, say […]
Author Archives: Arup
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 directly. Amplifier:- Ampifier is an eletronic circuit which increase the power of a signal (here’s audio signal). The audio output from a PC/mobile is only […]
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 controller. The charge controller is a device which keeps status of battery voltage, solar voltage, etc and charges the battery in a manner that the […]
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 battery,charger,earpiece. And after my primary phone was back from service, I had the good time to open the phone and see what’s inside. It was […]
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 our side. BuyCircuitsOnline. This will be our sales channel where you can buy kits and products developed or distributed by the team at Circuits DIY. […]
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 him success this time.
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. Upon building, the major fault was discovered. There was no connection to the input voltage so the unit is unable to measure the input voltage. […]
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 the SG3524 based one. Lets consider the following example: Battery capacity: 100Ah Battery voltage: 12V Inverter load: 500Watts Inverter efficiency (avg): 80%. Now when the […]
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: Charging via mini-USB connector which is very common. Charging status display by LED Simple circuit by using opamp, resistor, and not by any complex dedicated […]