Salvage Server Project 'Junk Ideas' No.3

The 'Tech2' L200
Variable Voltage Regulator


Produced by the Free Range Salvage Server Project, October 2003
email: fraw@gn.apc.org     web: http://www.fraw.org.uk/ssp/

Also available as an Acrobat file (for printing) – click here (1,012 kilobytes).




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Power is a problem. You always need it, but you don't always have a mains supply. So this regulator, originally designed as part of the Tech2 festival in 2002, was developed to solve the problem. It is able to regulate the variable voltage from a battery down to a constant voltage – for powering equipment like laptops.

The Tech2 Regulator is a variable voltage regulator designed for powering equipment from a battery pack. Most digital equipment functions at a wide range of non-standard voltages – from 7 volts (V) to 22V. These require a mains adapter. So if you want to go mobile, beyond the mains, creating these various voltages can be difficult. One option is to use a standard 12V or 24V battery and a mains inverter. But this actually is quite wasteful. You lose 10% of the energy in the inverter, and the power supplies for most low-voltage equipment may often consume as much power as the equipment itself.

Converting from a fixed battery voltage down to a pre-set DC voltage is more efficient (around 95% - 98%). But to do this you need a regulator. The Tech2 Regulator is designed to produce DC voltages from 5V up to 32V, using different 'packs' of batteries producing a nominal voltage of 12V, 18V, 24V, 30V or 36V. This is more efficient because the regulator need only regulate the voltage between 3V to 10V of the battery voltage, wasting less energy in the process.

The information on the Tech2 regulator is split into three parts:
  1. The Theory of the Tech2 Regulator – a technical guide to what the Tech2 Regulator is and how it works. The purpose of this section is to provide sufficient information for a person to develop their own version of the Tech2 Regulator.

  2. Building the Tech2 Regulator – an implementation of the Tech2 Regulator, in fact the design prototype, utilising a mixture of new and recovered parts (including an simple, scrap enclosure to mount the regulator in).

  3. Regulator Components and Sources – a table of the components required to build the Tech2 Regulator, and how to obtain them. This looks at the opportunity to obtain the components from junk as well as new.





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The Salvage Server Project has been developed by the Free Range Network to promote the use of redundant IT equipment as a resource for community and grass roots campaigning organisations. This report has been produced to support the work of the project, and is made freely available to encourage the objectives of the project.

© Copyright 2003, Paul Mobbs/Free Range Network. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with Invariant Sections being the document title and author identification, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is provided at: http://www.fraw.org.uk/_admin/rights.shtml This document has been wholly produced using the Gnu/Linux operating system and free software.

The information contained in this work has been obtained from sources that are believed to be reliable. However, We cannot provide any absolute guarantee that the information contained herein is wholly correct, or that the manner in which the information is used is correct, and consequently we cannot be responsible for any error, omissions or damages arising from the use of the information in this work. This work has been created on the basis that the Free Range Network is not intending to supply engineering or any other professional services – the purposes of this briefing are merely illustrative.