Home Blog  





5 Jun 2011

Phil Gonski, Christine Placek writes:

We propose to build a solar battery charger that will charge a variety of batteries: NiMH, NiCd, Li-ion, lead acid. Although there are solar battery chargers on the market, most are only for one application: cell phone, NiMH batteries, etc. Our charger will have the user input the battery type, capacity, and voltage. It will display the charge status and incorporate various safety systems, including temperature monitoring and battery polarity checking.

Solar Powered Battery Charger - [Link]

3 Jun 2011

picnote.blogspot.com writes:

I have designed many small footprint PIC projects (such as, pocket watches and wristwatches) but I cannot make them really portable. To make them portable, I need small power sources. Of course, Coin Cell battery would be the smallest DC source that I can buy. The problem is that a Lithium button cell provides 3 V. which is not enough to drive my projects. I thought about using DC-DC step-up converter to boost 3 V. to 5 V. However, it’s a little bit complex to add DC-DC converter to the projects. Moreover, my projects consume a lot of power as they consist of many LEDs, a button battery will not last for a day. So, I stopped my think at that point.

USB Coin/Button Cell Battery Charger - [Link]

19 May 2011

adafruit.com/blog writes:

Power packs to propel your projects! – If you want to take your project portable you’ll need a battery pack! For beginners, we suggest alkaline batteries, such as the venerable AA or 9V cell, great for making into larger multi-battery packs, easy to find and carry plenty of charge. If you want to go rechargable to save money and avoid waste, NiMH batteries can often replace alkalines. Eventually, however you may want to upgrade to the shiniest new technology – rechargable lithium ion/polymer batteries…

Li-Ion & LiPoly tutorial. Power packs to propel your projects! - [Link]

17 May 2011

neufeld.newton.ks.us writes:

Hey, real EE types out there, is there any reason I can’t monitor 12V battery voltage using a simple voltage divider into an A/D input of a microcontroller that’s powered by a voltage regulator on that same battery?

Monitoring Battery Voltage - [Link]


14 May 2011

rsdio writes: SMBus is similar to I2C, and should therefore be easily connected to most PIC or AVR projects. [via]

Highly integrated, 850kHz/500kHz SMBus-programmable battery chargers:

MAX17435/MAX17535, highly integrated SMBus™ battery chargers capable of operating at 850kHz and 500kHz, respectively. Unlike competitive solutions, MAX17435/MAX17436 allow the charge setting to be programmed via the SMBus interface, eliminating the need for external components and improving design flexibility. Programmable settings include charge current, charge voltage, input current limit, relearn voltage, and digital IINP voltage readback. The MAX17435/MAX17535 are ideal for notebook computers, ultra-mobile PCs (UMPCs), mobile internet devices (MIDs), and other battery-powered applications where space is critical.

SMBus-programmable battery chargers – [Link]

14 Apr 2011

On November 5, 2010 the press release from the NEC Corporation announced that they developed an improved organic radical battery for practical use. The first information about this organic radical battery (ORB) is from 5 years ago, when the prototype was thicker and had a lower output.

An organic radical battery is actually an extremely flexible, small sized battery that also has a short recharging time. In the belly of the “beast” we find a gel, an organic radical called polymer that is saturated with electrolytes. The battery also has a higher density then the Li-Ion type. Also the organic radical battery is ECO friendly and it’s not flammable or explosive. [via]

Flexible Organic Radical Battery by NEC – [Link]

14 Apr 2011

Vane writes:

Today i created pcb for Lithium Ion / Lithium Polymer USB Battery Charger with MAX1811, and designed with eagle pcb software.

About Max1811

The MAX1811 is a single-cell lithium-ion (Li+) battery charger that can be powered directly from a USB port or from an external supply up to 6.5V. It has a 0.5% overall battery regulation voltage accuracy to allow maximum utilization of the battery capacity.

The charger uses an internal FET to deliver up to 500mA charging current to the battery. The device can be configured for either a 4.1V or 4.2V battery. The MAX1811 is available in a small 1.4W thermally enhanced 8-pin SO package.

PCB for USB Charger with MAX1811 – [Link]

 

12 Apr 2011

EngineeringShock writes:

This circuit acts as a never-dying, forever rechargeable battery. If treated properly and with respect, it will live longer than you do! That’s right! You will die before this variable battery does! Eerie, eh? The circuit employs about $90 worth of circuitry, but it sure beats buying batteries. I use this circuit every single day when I get home from work to listen to music. Depending on your input charging method (DC, solar, etc), charging can take only minutes. With this, I can listen to music out of my computer speakers at high volume for about two hours before having to re-charge. Use it to charge your cell phone. Use it to power your radio! Use it as a portable power supply! Wire it up to a flash light, or use it to power your halloween costume! The possiblities are endless! I am selling this in kit form! See the last page of this instructable for details.

The Forever Rechargeable VARIABLE Super Capacitor Battery !!! – [Link]

12 Apr 2011

BrianH writes:

Do you have a pile of AA rechargeable batteries in your drawer? Some are old, some are new, but which sets would you bring with your camera on your next trip, and which ones are past their useful life? I like using rechargeable batteries, but I’m certain that some of them are not living up to the stated capacity on the label.

Rechargeable Battery Capacity Tester – [Link]

12 Apr 2011

JoshuaZimmerman writes:

When I got into electrical circuits and solar power the first thing I wanted to do was build a little solar powered battery charger. Only I had a heck of a time trying to find a simple and strait forward guide to doing this.

$4 Solar Battery Charger – [Link]



 
 
 

 

 

 

Search Site | Advertising | Contact Us
Elektrotekno.com | Free Schematics Search Engine | Electronic Kits | Electronics Projects