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.
-- On Sat, Jul 6, 2013 at 4:35 PM, John Griessen <john@industromatic.com> wrote:
On 07/06/2013 06:00 PM, jarlemag wrote:Magic might be required, but you can kinda sort of imagine a tortuous path
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..
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.To view this discussion on the web visit https://groups.google.com/d/msgid/diybio/51D8A9CD.5090904%40industromatic.com.
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