Napajanje i regulator za LED

Trebam pomoæ. Imam trafo 220/24 400VA i na njega planiram spojiti 46kom 3W LED (3.6V, 700mA) Razmi¹ljam to napraviti odprilike ovako; Trafo - Graetz - kondenzator (za peglanje napona - koje velièine??) - Arduino Duemilanove - TL783 - LED (vjerojatno 6 ili 8 stringova) TL783 bi trebao biti linearni regulator koji na izlazu daje 1.25-125V,

700mA. Na 700mA LEDice rade punom snagom, pa bi to volio regulirati sa nekim varijabilnim otpornikom (ili nekako drukèije) da struja bude oko 650mA. Pomagajte ljudi :D
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