BQ25504 Solar Cell LiPo Charger

Ultra-Low Power LiPo Charger via Energy Harvesting from a Solar Cell What is it? This is a small (0.5 x 0.5 inch) breakout board for Texas Instrument's BQ25504Ultra Low Power Boost Converter with Battery Management for Energy Harvesting Applications. From the datasheet: "The bq25504 device is the first of a new family of intelligent integrated energy harvesting nano-power management solutions that are well ...

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Counterfeit Macbook charger teardown: convincing outside but dangerous inside

What's inside a counterfeit Macbook charger? After my Macbook charger teardown, a reader sent me a charger he suspected was counterfeit. From the outside, this charger is almost a perfect match for an Apple charger, but disassembling the charger shows that it is very different on the inside. It has a much simpler design that lacks quality features of the genuine charger, and has major safety defects. The co ...

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Heavy duty portable charger for usb devices (phones, iPad, etc.) using PIC12F683

Heavy duty portable charger for usb devices (phones, iPad, etc.) Ever needed to charge your phone on the go? Can't find a wall socket to charge your iPod? Whenever I'm away from home for an extended period of time, I would charge my phone and mp3 player from my laptop.  This way, I get about 3 or 4 full charges out of the laptop battery and I could leave the phone and mp3 player chargers at home.  But carry ...

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Smart Battery Charger (no soldering!)

Many AA or AAA battery chargers charge batteries in pairs, but plenty of devices use 1 or 3 batteries, meaning that some of your batteries get overcharged and some get undercharged. NiCd and NiMH batteries also benefit from an occasional full discharge, which most normal battery chargers won't do. If you're anything like me you'll end up with a lot of rechargeable batteries, none of which end up being charg ...

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LTC4123 – Low Power Wireless Charger for Hearing Aids

Features Complete Low Power Wireless NiMH Charger Low Minimum Input Voltage: 2.2V Small Total Solution Volume 1.5V, 25mA Linear Single-Cell NiMH Charger Temperature Compensated Charge Voltage Integrated Rectifier with Overvoltage Limit Zinc-Air Battery Detection Reverse Polarity Protection Thermally Enhanced 6-Lead (2mm × 2mm) DFN package Typical Application Description The LTC®4123 is a low power wireless ...

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9 Volt Battery Charger

9 Volt batteries extensively used in various electronics measurement equipment. Powering these devices with  rechargeable batteries can be a cost effective solution. In this post a simple Lithium-ion 9 Volt Battery Charger design with overcharging protection will be presented. Charger is based on PIC16F876A microcontroller and uses its A/D module to monitor current flow into the battery.Number of required c ...

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Single-cell 5-A Li-Ion battery charger with MaxCharge™ technology

TI’s new bq25890, bq25892, and bq25895 5A chargers with TI’s MaxCharge™ technology charge your mobile device faster while keeping your device cooler. The switch-mode chargers can charge a 1-S Li-Ion cell to 80% capacity in 30 minutes, while traditional devices only reach 30%. The I2C-controlled chargers’ high efficiency and thermal management result in the fastest, safest and coolest charging capability. Ke ...

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LiFePO4 Charger

since I really like using LiFePO4 AA and AAA batteries in some of my projects [1][2][3], I finally gave in and built a dedicated charger for them. Previously I used a lab power supply to mimic the constant current/constant voltage charging curve, which worked also fine. But after seeing Patrick Van Oosterwijck nifty LiFePO4wered/USB™ [4], I thought it would be a bit more convenient to charge these batteries ...

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