Blinded by the Light?
The latest lamp technologies are claimed to save huge amounts of power but has their power factor correction (PFC) been overlooked or is it a simple matter of poor standards and sluggish industry regulation again?

Battery Checker
This intelligent battery checker will determine the state of cells so that an optimal selection can be made from them to form a pack.

Femto OS
It’s extremely economical with RAM and Flash memory.

The 2.4 GHz Bandalyser
With this handy portable scanner, you can quickly and easily see which WiFi and WLAN frequencies are being used in your area and which channels you should avoid for your own wireless network links.

Table of Contents Elektor February 2010

• Audio amplifier in dinner mint format

Design Tip

• Battery Checker

One to ten cells, up to 10 A

• Blinded by the Light?

Lamp PFC investigated

• Capacitors to the rescue

E-Labs Inside section

• Computer digital audio interface

Design Tip

• Elektor Teletext Decoder (1981)

Retronics series

• Femto OS

A tiny multitasking operating system for microcontrollers

• Hexadoku February 2010

Puzzle with an electronics touch

• Loud and Clear

A portable sound system with feedback suppression

• Mailbox February 2010

• Motorbike Chain Oiler with PIC

Reader Circuits

• PCB design—it’s not witchcraft!

E-Labs Inside section

• Stable Starting Points

An introduction to electronic power supplies

• Tailored Cooling

Online help for heatsink dimensioning

• The 2.4 GHz Bandalyser

See what’s happening on the band

• The ATM18 Radio Computer

Using the SI4735 DSP radio chip

• The loudest!

E-Labs Inside section

• Torture Rack

Dynamic testing of power supplies using simple tools

• TTL Bluetooth Dongle

Wireless data comms made easy

• Winamp Controller

Winamp control unit with motorised potentiometer and USB interface

Download: Elektor Electronics Magazine Febraury 2010

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