Radio Shack Portable AC-to-DC Regulated Power Supply Manuel d'utilisateur télécharger pdf

TOPA Portable Power Guidelines

Introduction

Gone are the days of the intrepid globetrotting photographer armed with a manual FM10

around the neck and a hipsack full of film. At the most, her power requirements

amounted to a pack of AA lithiums. Today’s professional travel and outdoor

photographer is more likely to be found with a couple power-hungry digital SLRs

bristling with fast-recycling smart flashes. She might even be toting a portable hard drive,

a laptop and location light kit. Still, she finds herself in the same remote areas for

extended periods of time as before. That means she needs portable power, and a sack of

AAs aren’t going to cut it anymore. This document will explore the current technology of

portable power for the modern outdoor and travel photographer.

Power Primer

You need to convert fuel to electricity and deliver it to your device. Portable fuel sources

include gas/diesel, solar and battery. There are two main types of power delivery

schemes: Alternating Current (AC) and Direct Current (DC). DC technology has come a

long way in terms of power and longevity, mostly in the form of batteries. Today even

high-power devices such as laptop computers, automobile lights, digital cameras and

flashes are powered by DC supplies inside.

So why do we still use AC power? A wire can carry higher voltage over long distances

more efficiently than lower voltage, and AC can be amplified (via a transformer) more

easily to higher voltages than DC, so it makes sense that centrally-generated power for

cities would use AC. As a result, most household appliances, and powerful studio lights,

are designed to run off AC power. Some devices like computers are actually using DC

power inside. That brick in the middle of your power cord is an AC-to-DC converter.

Still, generating continuous AC power requires a fuel source very close by. In the case of

portable light power, it is actually another DC battery! This reverse conversion from DC-

to-AC is done by an inverter.

Many DC-powered devices use a rechargeable battery such as a Lithum-Ion or Lead-

Acid cell. These batteries can only recharge from an AC current. Even high-power

portable studio strobes such as Lumedyne and Hensel Porty will eventually need to be

plugged into AC power to recharge. True studio strobes such as Speedotron have “power

packs” which are just really big converters that take AC power and distribute them

intelligently to all the lights. Realistically, you will almost always need AC power at

some point. It’s up to you to decide what devices you are going to need out in the field.

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Résumé du contenu

Page 1

TOPA Portable Power Guidelines Introduction Gone are the days of the intrepid globetrotting photographer armed with a manual FM10 around the neck a

Page 2

Here is a list of common types of AC and DC power available today, from least to most portable, with common examples Power Source Pros Cons Outle

Page 3

Collected Wisdom from TOPA Chris Barth: Two of the solar chargers I've seen, and one for smaller devices is at: http://www.solio.com/html/ind

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should we go elsewhere. The only other piece of equipment I have is a small inverter for the car, which I got at a discount store somewhere; with it

Page 5

Harrison Shull: Here’s some beta [from TOPA member Jef Maion] on opting for digital capture when traveling to remote areas of the world for expedition

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Radio Shack Portable AC-to-DC Regulated Power Supply Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Unités d'alimentation électrique Radio Shack Portable AC-to-DC Regulated Power Supply. TOPA Portable Power Guidelines Manuel d'utilisatio

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