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

Would you need a diode? Would you need to decouple the motor from the
antenna, how would you tune it's resonant frequency? If you can't
change the motor circuit's resonant frequency, where can you get a
high-enough power tunable microwave emitter?

On Sat, Jul 6, 2013 at 5:40 PM, Simon Quellen Field <sfield@scitoys.com> wrote:
> We used to build microwave leak detectors by putting an LED across the leads
> of a 1N914 diode. The diode's leads were just the right length to make a
> resonant dipole antenna for the microwaves. If there was enough energy in
> the rectenna to light the LED, the seals on the microwave were deemed
> inadequate. If you placed it inside the microwave, the LED got too much
> current and became a Dark Emitting Diode (DED).
>
> If instead of the LED, you put a small DC motor, it would spin. If it spins
> too fast you can add a resistor. Put a magnet on the motor's axle, and you
> have a magnetic stirrer. Put all of that in a housing and you're good to go.
> No integrated circuits required.
>
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>
>
> On Sat, Jul 6, 2013 at 4:35 PM, John Griessen <john@industromatic.com>
> wrote:
>>
>> On 07/06/2013 06:00 PM, jarlemag wrote:
>>>
>>> Could you explain the physics of that in a bit more detail?
>>>
>>> - JP
>>>
>>> kl. 23:57:10 UTC+2 lørdag 6. juli 2013 skrev Cathal Garvey (Phone)
>>> følgende:
>>>
>>> Along same lines I've often wondered about a microwave-powered
>>> stirbar. As in, magnetic strip/plate under flask, magic bar in
>>> flask absorbs microwaves and self-propels. Would be great for keeping
>>> temperature even in drinks, let alone flasks of broth..
>>
>>
>> Magic might be required, but you can kinda sort of imagine a tortuous path
>> to getting microwave energy, running a computer programmed gizmo,
>> balancing
>> heating vs stirring power somehow would be tough...
>>
>> It's all so much easier to imagine a time slicing do this, do that, do
>> this,
>> do that kind of machine without much magic required. You'd use a
>> no-permanent
>> magnet stir bar -- just paramagnetic iron with a plastic wrap. Move that
>> for a while with
>> magnetic fields, stop that, blast with microwave energy field, stir again,
>> repeat while necessary.
>>
>> And sure, Arduino IDE can be used to develop it.
>>
>>
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--
-Nathan

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