Photovoltaic Solar Battery Regulator and Load Controller

This Solar Battery Regulator project allows solar cell arrays to be connected to either conventional lead-acid, sealed lead-acid, or lithium storage batteries without fear of overcharging. The project can be used to drive two different electrical loads from the batteries at two different charge states to maximise power usage efficiency.

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Mini PSU for Breadboard

The purpose of the project is to create a 5V mini Power Supply Unit for breadboard. The project can be connected to 8-18 DC power source, or 9V battery. During construction, put the components in as tight as you can, while verifying that you can in fact complete the circuit on the underside of the board without adding any wires. The main component in this project is voltage regulator LM 7805.

To build this you need:

Some electronics skills. Soldering, knowing how to follow a circuit diagram etc..
1 voltage regulator LM 7805
1 10uF capacitor
1 1000uF capacitor (you can use any big electrolyte capacitor here, doesn't have to be exactly 1000uF)
1 100nF capacitor
1 LED for power on indication
1 resistor to take the voltage down from 5V to whatever your LED runs at
1 screw terminal for the input voltage
1 switch for input voltage on/off
1 perfboard, the type with copper eyes, not stripes
1 2-pin connector to plug the unit into the breadboard

more

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Small USB Device Charger

This advance tiny USB battery powered charger is handy tools for your need. You can use it to charge almost all devices which are charged via USB, like iPods or mobile phones, with only two AA-Cells. The Most important compenent of the cicuit LT1301. This is a small step up converter for to build switching mode power supplys with only a few external components.

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Schematic and document

tag : USB Charger, Battery Powered Charger, Small Charger (src)

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Compact Variable Power Supply

This is a handy little power supply that can provide a voltage range of 1.25 to 13 volts and current up to 500 mA. The supply, created by Don Wilschefski, is housed in a small plastic enclosure 90 x 55 x 32 mm.

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schematic

search term : Power Supply, Handy supply, Variable PSU, analog project (src)

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Battery Charger for Hand Held Radio

This is a handy little charger that can provide a charging current of up to 120 mA continuously for batteries in the range up to 12 volts. This project inspired by 12 volt 500 mA plug pack at an amateur auction. Two potentially useful projects resulted from this plug pack. The other is a variable power supply. The supply is housed in a small plastic enclosure 90 x 55 x 32 mm.


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Schematic

search term : Battery Charger, Hand held Radio charger, Analog Project (src )

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