1/27/2024 0 Comments 2 piezo crystal wiring diagramHot glue the connections to prevent the wires from breaking off.Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress.Be sure to check polarity since DC voltage has positive and negative terminals. Solder the wires to the bridge diode accordingly.Twist the frayed wire strands of each wire, and tin them with solder.For the purpose of this project, we will only need the red and black wires, so strip those as well.Strip the usb charge cable that came with your battery pack to reveal the internal wires.Since the current is AC, the position of the wires are interchangeable, as long as they connect to the correct diodes in the diagram. Wire the piezo element wires to the bridge diode according to the circuit diagram.By following this diagram, you should be able to create the bridge diode. If you have small, rectangular diodes like me, the positve sides are not marked by coloration, but rather small, engraved lines/notches. The arrows always point to the side of the diode that is marked, also known as the positive side. Ok, so for those of you who do not know how to read a circuit diagram, those 4 line segments with arrows on them represent diodes. Remember, you only need to get 4 of the diodes in order to create our AC to DC converter. If you have a heat gun, you can take the diode off much easier by applying heat all around the diode so both sides of the diode can be pulled away at the same time. Once you have located the diodes, you can take them off by heating up the solder with your soldering iron and pulling the diodes away.However, if you are like me, your diodes are rectangular prisms, not round, and have engravings on one end to mark the positive side. Most likely, your CFL bulb will contain 6-8 round, black diodes with gray stripes on them to indicate their positive ends.You can either cut these off like a civilized person or do what I did, which was to continually pull until the wires broke off. Once the bulb has split apart, you will notice that the PCB inside is being held back by two wires connected to the lightbulb's metal base.Locate the seam by which the two plastic halves of the CFL bulb are connected, and begin to carefully pry the two pieces apart with your screwdriver.By doing this, you can significantly lower your chances of braking the glass tube, which contains poisonous substances that you don't want to mess with. Go outside with a screwdriver or some sort of tool capable of prying things apart, and sit in the grass or some other soft material.Here is how you do it:ĬAUTION: CFL BULBS CONTAIN MERCURY AND OTHER POISONOUS MATERIALS WITHIN THEIR GLASS TUBES. If you are like me in that you do not have diodes lying around, have no fear! You can find perfectly good diodes inside of your old, broken CFL bulbs in your house. NOTE: If you already have your diodes, you can skip this step! Once all of the piezo elements on the heel piece are wired in parallel, solder the last piezo in the chain to one of the piezo elements on the toe piece, and continue to solder the piezos in parallel until all 14 elements are connected. You can connect the piezo elements from one side of the plastic to the other by threading the wires of one of the piezo elements through the holes so that they can be soldered in parallel to a piezo on the other side. In order to prevent wires from braking off of the solder joints, use hot glue to fasten part of the wire in place so that the stress on the wires is not enacted upon the solder joint. In this way, we will be able to increase the amount of amps and consequently charge our devices faster. We can solve this issue by wiring the all the piezo elements in parallel (in other words, the positives are always soldered to each other and the negatives are always soldered to each other). We can solve this problem by creating a bridge rectifier with diodes to convert the AC power to DC power we can use.Īlthough piezo elements generate plenty of voltage, they do not generate many amps. The only issue with this, however is that we need DC, not AC in order to power our stuff. Fortunately, we can take advantage of this special property by putting piezo elements underneath our feet in such a way that every time we take a step, we are using our weight to push on the piezo electric elements- which then in turn convert that energy into electricity. Piezo electric transducers, or piezo elements, are comprised of materials such as crystals and certain ceramics that have a special property which allows them to convert physical energy into AC electricity. Essentially, the main power source that makes this project possible is something called a piezoelectric transducer (I know, its a mouthful). In order to fully appreciate the science behind this project, it is helpful to understand how it works. NOTE: If you do not like learning about really cool stuff, you can skip this step.
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