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Electronic Valentine Heart

LEDs are red my dear…

Electronic Valentine Heart
Although this month’s Mini Project is not exactly stunning from a technical point of view, there are a number of unusual sides to it, mainly regarding why and how it came to be published in this issue. Read on…Unusual aspect no. 1: This is the first Valentine circuit ever to be published in Elektor, and no, the highstreet flower shops are not to blame if that is the first you associate with Valentine’s Day. Valentine’s Day is reportedly the day we ‘celebrate’ the beheading of a priest called Valentinus on 14 February 270. The execution orders came from an oppressive emperor called Claudius Goticus (a.k.a. Claudius II). According to some sources, Valentinus was a bishop and the 14th of February a popular Roman holiday. The legend of Saint Valentine tells us the martyr was executed for illicit marrying of Christian couples, the occasions being marked by Valentinus presenting lots of flowers to the newly weds.
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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.

R1 = 180Ohm
D1-D15 = LED, red, low-current
S1 = 3-way SIL pinheader, angled, with jumper (alternative: miniature slide switch)
Battery holder = SMD button cell holder (e.g., Farnell # 302-9785)
Two button cells type CR2032
PCB, available from The PCBShop
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