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LED Christmas Decoration

A novel ornament

LED Christmas Decoration
As this issue comes through the letterbox, it’s around the time that the Christmas decorations are taken out of the attic. And if you hurry up there is just enough time to add a homemade electronic ornament to your tree. This article shows you how to do just thatIt has become something of a tradition that the December issue of Elektor Electronics includes a project for some kind of distinctive Christmas decoration. Since a true electronics hobbyist should not be content with a standard Christmas ornament, we have provided the opportunity to add a personal, homemade touch.
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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:
R1,R3 = 1kOhm
R2 = 22Ohm
R4 = 47Ohm
R5,R7 = 470Ohm
R6,R8 = 47kOhm
Capacitors:
C1,C2 = 47µ F 25V radial
Semiconductors:
D1-D9 = LED, high-efficiency, red
D10-D18 =LED, high-efficiency, green
T1-T4 = BC547B
Miscellaneous:
Two penlight (AA) batteries
Battery holder for above
PCB, order code 030157-1
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