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Lithium Torch

Lithium Torch
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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors:
P1 = 2k?5 preset
Capacitors:
C1 = 47nF
C2 = 22nF
Semiconductors:
D1 = super HR LED, white
IC1 = BTS629
(Conrad Electronics # 1759 86)
Miscellaneous:
S1 = pushbutton (e.g., Farnell # MCDTS-5M)
BT1 = 2 off CR2025 or CR2032
Case: KM type Box UM14 (Nedis)
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