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USB Li-ion Battery Charger
Posted on Wednesday, April 28, 2010   •   Category: Battery Chargers


This is a charger for lithium ion batteries which takes its power from the USB port of a computer. It uses the MCP73861 or MCP73863 Li-ion battery charger chip manufactured by Microchip. Microchip MCP73861 or MCP73863 are advanced, fully-integrated, single-cell Li-Ion/Li-Polymer charge-management devices allow these peripherals to utilize the full power of the USB port.


Solar Battery Charging
Posted on Wednesday, April 28, 2010   •   Category: Battery Chargers


This instructable will show you how to make your own solar battery charger from very simple components. It is taken from my documentation provided with a kit I supply - you should easily be able to source the same components yourself of course.


15V / 28V 4A Transmitter Power Supply
Posted on Wednesday, April 28, 2010   •   Category: Power Supplies


Power supply used for professional FM broadcasting transmitter.


LM3876 GainClone Amplifier
Posted on Tuesday, April 27, 2010   •   Category: Amplifiers


The amp is based on the Project 19 PCB, so uses a pair of LM3876 (or LM3886) power opamps, run from a 35V supply. I used a cut-down P88 preamp PCB because I only wanted one preamplifier stage, but the entire board can also be used. Alternatively, the P19 amp can be run at higher gain than normal, alleviating the need for a preamp at all. The down side of this is that the noise level will be higher, and background noise may be audible with efficient speakers and/ or very quiet surroundings.


Atmel Solar Panel Battery Charger
Posted on Tuesday, April 27, 2010   •   Category: Battery Chargers


Batwatch is a simple monitor for a solar panel battery charger, using an Atmel ATtiny13V. It periodically measures the charge current and battery voltage, and shows them by blinking two LEDs. I built this circuit into the plug of a VW solar charger panel that is used to prevent a discharge of the battery when a car is not used for some time. A modern car contains a large amount of electronics, and a quiescent current of 40-50mA (about 1Ah per day!) is considered "normal".


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