Mounting the LEDs was also my biggest unknown fear. I ended up printing these:
http://www.thingiverse.com/thing:543402
The sides fit onto the axle caps and you need to drill two holes for the front. I like this one the most because the LEDs stay hidden somewhat.
As for the 7812 vs the "fancy ones". I had a 7812 in my electronics box and I wanted to make it that weekend But I agree, the other is better
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anon4321 16
Can those that have done this mod take pics of how they mounted the lights? I need some ideas on they best way....
Also, don't mess with heat sinks and linear regulators....
While probably 20x the cost but still only like 9 euros, don't waste power as heat and get a 12V/1A version of these:
http://www.recom-power.com/pdf/Innoline/R-78Bxx-1.0_L.pdf
The part number for the 12V - 1A (12 watt) version is R-78B12-1.0
Based on the app note, no caps are needed for an input of 19V.
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