Rotary woofer (was Re: [sdiy] Brain filling in fundamental)

[cheater cheater]

It could double as a subwoofer AND a turbine!
Turbine powered cars! Rotary subwoofers! Potato electricity!

On Mon, Jul 21, 2008 at 1:14 PM, Paul Perry <pfperry at melbpc.org.au> wrote:
> For at least part of the operating range, the air flow (and hence pressure
> generated) is reasonably linear with RPM for a fan.
> So a motor speed controller could be used for your DIY infrasound generator
> - plus, it won't infringe the patent.
>
> If you want greater precision, you could use a pressure sensing cell to
> derive feedback. Pressure cells go down to DC.
>
> I hope nobody thinks of fitting one of these to a car....
>
> Paul perry Melbourne Australia
>
>
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