| Author | Message | | | eric | | Posted: Sun Aug 27, 2006 6:38 am Post subject: Lithium Torch | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | This mini pocket torch combines the advantages of Lithium
button cells with a super-bright white LED. The lithium cells
are small, have a long shelf life and have very little self-discharge.
The LED has very high efficiency, an extremely long
life expectancy and a modest current consumption (20 mA).
In combination this results in an exceptionally long-life pocket
torch.
It is unfortunate that a Lithium cell has a voltage of only 3 V,
while a super-LED has a forward voltage of 3.5 V. One cell will
not suffice and we therefore will have to connect two in series.
That results in a power supply voltage of 6 V, and at a current
limit of 20 mA we need a series resistor
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