If you are traveling, you might need this device to charge your gadget along the way, since it is much cheaper to buy some standard AA batteries for backup than buying several rechargeable batteries of your gadget type. Below is a charger that more efficient than linear regulator like the “7805″ while you are on the go. The most important component on this device is the “LT1301″. This is a small step up converter for to build switching mode power supplys with only a few external components. Below is the schematic diagram of the circuit:
To build this device, you need a LT1301 and a ic socket (8DIP), 2 electrolyte caps WITH! low ESR (6,3V 100uF), one inductor with a very LOW! DCR (around 0,03R) with 10uH should be able to handle switching currents at about 1,5 Amperes, one schottky rectifier like “SB130″ or “1N5817″ (important if you can’t get one of the two proposed rectifiers: low forward voltage drop, fast switching capability and it should be able to handle currents of 1 Ampere.), and A switch(on/off), an usb connector, a circuit board, a LED with resitor (limit led current to 2mA!, don’t loose your mA by pumping them through the LED) and don’t forget the battery holder.
Possibly Related Articles:
- Sealed Lead Acid Battery Charger: Dual Step Current Charger Mode
All of the necessary circuitry to optimally control the charge and hold cycle for sealed lead acid battery can be implemented using UC2906 series of battery charger controllers. These integrated... - Automotive/Car Power Adapter For 3V, 6V, or 9V DC Operated Devices
In automotive environment, it’s common that only single voltage power outlet is available. Using the very popular LM317 voltage regulator IC, we can build a general purpose DC adapter to... - 12V Car Battery Charger
This is 12V Car Battery Charger simple circuit. This circuit is designed to solve some problems that occurs in most car battery chargers. The problem that occur in most car... - Ni Cad Charger with Thermal Control
Ni Cad batteries can be charged at high current rates because it allows short charge time. But, it has difficulty in operations such as excessive internal heating degrades the batteries... - Auto-Off 12V NiCd Battery Charger
NiCd/NiCad battery charger circuit is still needed since some application demanding high current is still rely on NiCd type, since this type is still superior in term of high current... - Low Cost Universal Battery Charger
This is a Low Cost Universal Battery Charger Circuit. This circuit is used to charge NiCD-NiMH batteries and ideal for car use. This circuit transforms a mains adapter to a... - Stand Alone 600mA Li-ion Battery Charger
A constant-current/constant-voltage linear charger for single-cell lithium-ion (li-ion) can be constructed using only a tiny battery charger controller chip EUP8054 and a few passive components. This tiny integrated circuit chip... - Lead Acid Battery Charger Using Max773 IC
This battery charger circuit use a flyback converter topology, and implements a current-limited power supply to charge lead-acid batteries. Here is the schematic diagram of the charger circuit: The flyback... - Automatic 12V Lead-Acid Battery Charger
This charger circuit is suitable for lead-acid battery, including flooded, gel, and AGM types. The automatic term means that this charger will stop charging automatically when the battery voltage reach... - Fast Charger for Better Lead-Acid Battery Life
Compromising between the speed while maintaining safe operation for battery charging is an interesting challenge. This circuit can be used to charge a battery , and it’s safe and rapid. ... - Simple Automatic Nicad (NiCd) Battery Charger
Many cheap battery chargers usually assume that charging the battery slowly is OK although the battery is already full of charges. All they do is usually charging the battery with... - Simple Smart Nicad (NiCd) Battery Charger
In application that demand for high current, Nicad (NiCd) rechargeable battery still has the unbeatable performance compared to NiMH and Lithium battery. The charger circuit here is smart in the...
| 
