![]() ![]() It turns out that all the maths we use to design electrical filters can also be used to design mechanical filters and 1946 Robert Adler from Zenith did exactly that. As I said when I started, Voltage is Force and Current is Velocity. ![]() Turns out that our electrical theory with inductors, capacitors and resistors have mechanical equivalents, specifically mass, stiffness and damping. The same is true for mechanical filters, less energy loss, better reproduction, better outcome for the things you want to keep and hear. The same pendulum swinging through air retains most of its energy and has a high Q. Think of a pendulum swinging through oil, it's losing lots of energy for every swing and has a low Q. Another way is to say that - mechanical filters have a much higher Q. The radio already has filters built-in, but mechanical filters offer a cleaner output with less distortion across a wider range of temperatures. The purpose of this was to improve the way the radio ignores unwanted signals and as a result has an easier time hearing what it is you really care about. You heard that right, in my shiny solid-state radio, I added moving parts! It all came about when I installed two mechanical filters into my radio. The other day a whole new world opened up to me when I came across the idea that Voltage is the same as Force and Current is the same as Velocity.
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