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 […]

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 […]