2017-09-25 (M) Electronic Business Card, 555 Timer, Busi555Fin COMPLETED

When the Busi555Rake failed, a lot was learned. It may still be possible to make a single-sided business card with an integrated battery holder but double-sided boards offer the benefit of adding details to the back instead of leaving them bare.

The old rake design was entirely eliminated and a 3-finger design was created. The 3-finger design relied on a solder pad on the underside to contact the positive battery terminal while the top-facing solder pads would contact the negative battery terminal.

Layout of card

Copies were ordered along with inexpensive batteries. Parts were ordered from a nearby distributor. Solder paste was purchased locally. All the components were soldered with a solder relfow station since a hot-plate might scorch the silkscreen on the bottom of the board. 

Front of card with components

The squiggle pattern was nothing more than output from a filter in GIMP but the design was subtle enough and it left an interesting texture not usually found on business cards. The raised bumps of the paint felt like raised lettering found on expensive prints.

Back of card, pattern

A battery was added to the card and without any special alignment or tricks, the circuit began working flawlessly.

Functioning business card

Project page on EasyEDA

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Completed projects from year 1 
Completed projects from year 2
Completed projects from year 3

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2017-09-12 (Tu)