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Also see Catalogues and Suppliers of PARTS and Electronics Magazines
Electronics
Maplins - Electronics catalogue
Rapid Electronics - Electronics catalogue
Electrical Shops / Consumer Electronics
LINDY for connections, cables, etc.
Weifang Keyuan
Electronics Co.,Ltd. - ELECTRET MICROPHONE
No.67 Chunyuan Weifang China (was http://www.wfmic.com)
Quasar Electronics - electronic kits specialist
Mascot power supplies www.mascot.no
Holroyd Instruments - specialists in acoustic emission and sensor systems for condition monitoring of equipment. Don't forget to ask if the condition monitoring equipment is compatible with Linux
Pressure & Temperature measurement www.wika.de
Also note that a lot of suppliers can be contacted via the Electronics Magazines many of which are available just by asking.
The idea that Lime Scale reduces the efficiency of electric water heaters - so where does the wasted energy go?!
High Voltage Lines ? - efficiency in I^2 R
Fruit machine bits are on sale at the page of Amusement Machine Bits
Audio Related stuff
How to Connect a Pair of Hi-Fi Speakers to a Computer
How to make a speaker into a microphone
How to make a television into an oscilloscope
How to make a television left right reversing
How to put up a Shortwave aerial
The difference between satellite cable and ordinary television aerial cable and why it matters
Voltage and Current explained
What to do if your electronics gadget goes in the water - recovering electronic devices from a watery grave