Extreme Business Cards

Step 7 Electronic Construction

Assembling the electronic components is not hard, but needs a steady hand, and some experience with soldering. Solder the components as per the image. The two batteries straddle the PCB and are opposite ways around - the one on the left should have its positive side up. You can't see from this image, but you also need to solder a piece of wire between the two battery contacts on the opposite side of the board as well. The PIC is soldered to the PCB on the supplied pads - pin 1 is on the bottom left - if you have very good eyesight, the writing should be the correct way up when you are soldering this item as shown in the image. I find the technique of tacking one pad down with solder first to hold it, and then soldering the other pads, works well. The piezo is soldered to the two pads closest to the chip. I have reduced the length of the wires so that the whole assembly fits within the space of a single blank PVC card.