Re: [DIYbio] Re: Interested in Automated Cell Culturing?

Ah, I assumed including a battery would be effectively a no-no, good to
know you could potentially create a conventional-but-shielded device.

Also, in your other email you suggest that absorbing "too much" power
into a rectenna-powered device would fry the microwave: is this an
EM-coupling thing? I assumed a Microwave was like a "bath", and that
absorbing all the EM in there would just deplete the available wattage
for cooking with, rather than causing the diode to emit even more EM?

On 07/07/13 19:30, Simon Quellen Field wrote:
> The motor and its coils are getting the rectified DC from the rectenna.
> They are not part of the resonant system.
>
> The main problem is that the motor needs a lot more current than the LED
> did.
>
> Rather than power the thing with microwaves, the simple approach of
> using batteries is probably so easy and cheap that implementing Cathal's
> dream machine would never be as practical or cheap. I was just trying to
> rise to the challenge. :-)
>
> Has anyone on the list built their own magnetic stirrer yet?
> A motor, a bar magnet glued to the axle, a couple batteries, and a
> non-ferrous metal enclosure to prevent the microwaves from cooking the
> batteries, and you are all done. Add a rheostat to control the speed.
> You could drill a hole in the metal box for the axle and glue the magnet
> on the outside of the metal box, then put a glass plate above it to hold
> the beaker to be stirred.
>
>
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>
>
> On Sat, Jul 6, 2013 at 8:19 PM, Nathan McCorkle <nmz787@gmail.com
> <mailto:nmz787@gmail.com>> wrote:
>
> On Sat, Jul 6, 2013 at 6:46 PM, Simon Quellen Field
> <sfield@scitoys.com <mailto:sfield@scitoys.com>> wrote:
> > The emitter is inside the microwave oven. Mine has 1400 watts,
> which seems
> > to be plenty of power to boil water.
> >
> > You need the diode. It converts the gigahertz frequencies into DC
> that the
> > motor can use.
> >
> > A dipole antenna is simply two conductors whose length determines the
> > frequency at which the antenna is resonant. For collecting power,
> you don't
> > actually need to be resonant. You'd collect less power, but there
> is 1400
> > watts to play with, and the motor only needs 50 milliwatts or so.
> >
> > The microwave oven frequency is 2.45 GHz. A wavelength is thus 12.24
> > centimeters. A half-wave dipole would thus be 6.12 centimeters
> across, with
> > each leg being a bit over 3 centimeters long. Cut each lead of the
> diode
> > down to 1.2 inches and you have your rectifying antenna for 2.45 GHz.
> >
>
> Aren't you discounting the length of the coils in the motor? We don't
> really know how long they are, and they're probably a different gauge,
> if the thickness matters (but it sounds like you say the length only
> matters).
>
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