It can often be fairly dark under water, especially at greater depths. A diving torch is essential if you want to be able to enjoy the marine scenery (or to help with a rescue operation). It’s easy to go out and buy a new lamp, but an old one still has its uses too! More so if we add some powerful LEDs.
Resistors
R1,R2 = 6Ω8
R3,R4 = 8Ω2
R5 = 1kΩ5
Capacitors
C1,C2 = 1000(F 25V radial
Inductors
L1 = 100(H (C&D Technologies type 1410478C)
Semiconductors
D1 = MUR420
D2 = zener diode 8V2
D3 = BAT82
IC1 = LT1070
D4-D10 = Luxeon Star 3W LXLH-LW3C
Miscellaneous
7 x collimator lens, 15º, Carclo part # 10003/15
7 x lens holder, Carclo part # 10043
PCB, ref. 070011-1 from www.thePCBShop.com
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