http://www.weethet.nl/english/hardware_resistor_calculator.php

http://www.mechatronicart.ch/diymakeaway/

http://www.nicolascollins.com/

http://www.anti-theory.com/

blah

utils

http://www.ralfschreiber.com/solarsound/solarsound.html

http://dirtyelectronics.org/

http://solar-active.com/

http://access-space.lowtech.org/

http://valentinaschivardi.com/

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