“How to Make sure the Government Doesn’t Listen to Your Phone Calls.”
#ComponentsCloseUp No. 049: MEMS Omnidirectional Microphone (Knowles PN: SPUL409HE5H-PB)
This was meant to be a demonstration of how thin the two layers are in a MEMS microphone. The top layer is meant to be flexible (diaphragm), while the bottom layer is fixed (backplate). An incoming sound wave causes the diaphragm to flex towards and away from the backplate, which results in a changing capacitance. More detailed photos of this part coming soon! (Also, you aren’t going to want to miss No. 050, which will be coming up right after that 😁)
P.S. - Please don't actually do this to any microphones in your phone or device, because then nobody will be able to hear you. 😅 ***
Song: Derp Nugget
Artist: Kevin MacLeod
License: http://creativecommons.org/licenses/by/4.0/ ...
◽ The Smith Chart, Invented BBy Phillip H. Smith (1905–1987) Is a Graphical Aid Or Nomogram Designed For Electrical And Electronics Engineers . .
◽ In radio frequency (RF) engineering to assist in solving problems with transmission lines and matching circuits . .
◽ The Smith chart can be used to simultaneously display multiple parameters including impedances, admittances, reflection coefficients, scattering parameters, noise figure circles, constant gain contours and regions for unconditional stability, including mechanical vibrations analysis . .
◽ The Smith chart is plotted on the complex reflection coefficient plane in two dimensions and is scaled in normalised impedance (the most common), normalised admittance or both, using different colours to distinguish between them .
◽ These are often known as the Z, Y and YZ Smith charts respectively .
◽ A locus of points on a Smith chart covering a range of frequencies can be used to visually represent .
* how capacitive or how inductive a load is across the frequency range . .
* how difficult matching is likely to be at various frequencies . * how well matched a particular component is
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