![]() To do this, we simply send the low impedance signal from the amplifier into the low impedance coil, and this will produce a high impedance signal to drive the piezo. In order to drive the piezo using the amplifier, we need to take the low impedance output from the amplifier and make it high impedance. The piezo is typically a high impedance device, and the audio amplifier is always providing a low impedance signal to drive a speaker. However, we have the opposite problem we need to solve. The audio output transformer is designed to take a high impedance source and make it low impedance. Typically, audio sources have a high impedance of a few thousand ohms, and speakers have a low impedance around 8 ohms. Long story short, impedance is kind of like resistance in AC electronics (but not exactly the same). The reason the input is the output is because of impedance, a concept we are not really covering in this class, but one particularly important when dealing with transformers and AC electronics. Typically the primary is the input side, but we are actually driving the transformer backwards, so the primary side is our output to the piezo. Make note of which jack is connected to the side of the transformer labeled "P". Insert the jacks into the mounting holes in the enclosure. If you would like an alternate suggestion for a supplier of any of the parts, please let me know. I reinvest this money into materials and tools for future projects. However, I earn a small commission if you click on any of those links and buy anything. This does not change the price of any of the items for sale. It is different than a speaker in that it does not use any coils or magnets, but has some similarities. This is a special type of material that expands and contracts when electricity is applied, and can also produce electricity when expanded and contracted. Please note that some of the links on this page contain Amazon affiliate links. A piezo disc is basically a metal disc with a special piezoelectric ceramic coating. If you can't find one, then just buy any old male-to-male mono cable and cut off one end, and strip away the insulation to expose the wire. 60 x 8 4.8 60 x 74 44.4 Total 15.6 4.8 79.6 So the approximate. *** This type of cable has a plug on one end and a signal and ground wire on the other end. Then plug the piezo cable into the female adapter. To connect the amp's output to the piezo I recommend just buying a female jack adapter, and connecting wires between the adapter and one of the red and black pairs of speaker output ports in the back (black-to-ground, and red-to-left). This one that is linked should work as replacement. SMD03T04S311 - Mini Piezo Ceramic Disc 3x0.4mm S 675 KHz. ![]() You might still be able to find it on Ebay. Currently the Australia on Disc CD- ROM disc is available from both UDS and. (x1) Double-sided tape * It has been brought to my attention that the Radioshack test amp I used is no longer available since they went out of business. piezo siren Rechargeable 12V battery Built-in automatic battery charging. (x2) 1/8" male-to-male mono (or stereo) cable To Turn Nearly Anything into a Speaker you will need:
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