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SIM cards believe it or not come in 4 sizes  SIM Card  - Not used any more; about the size of a credit card. Mini-SIM Card  - The most common in the previous generation, it's what most people would call a SIM card. Micro-SIM Card  - The now standard for smartphones; much smaller; just about contains the contacts on the back. Nano-SIM Card  - I've only seen it used so far in Apple iPhones, but I'm sure it will catch on; this is literally just the contacts. Step 1: Get a Sim Card + Scissors No matter what size, I think most of you will have the Mini SIM Card and will want to cut that down to a micro-SIM card but a Nano SIM is also possible. Step 2: Download This Page and Print This is a link to a page  from a UK mobile network that gives you the guide on how to cut your SIM down to size. Step 3: Mark Up and Start Cutting Obviously be careful when cutting, you will want to follow the guide exactly. You will see the actual memory of t...

updated 22-02-10 This was a very successful project, I used an off the shelf  3 bladed propeller, beautifully balanced and extremely strong, made from glass filled nylon, they are designed as 'pusher' props and can spin at up to an amazing 13 000 rpm when driven by a radio control plane engine. I suspect just 2000 rpm will be my max as a wind generator. I am using this propeller mounted backwards, so the flat side is facing forwards and the true aerofoil is on the back. Having the blades pre made allowed me to focus my attention on matching the alternator to the blades characteristics, having seen Ed Lenz's work over on  Windstuff now  using radial air core alternators, I decided to work along similar lines. The benefit being, no iron in the design therefore no  cogging   effect that would kill a tiny wind turbine (mechanical resistance making it barely start up). I sourced a very powerful N42 Neodymium cylinder magnet  here  that differs...