Three actually ;-)
Come to think of it, I don't think Ian made the cut..?
Tim
-- In the immortal words of Ned Flanders: "No foot longs!" Website @
Three actually ;-)
Come to think of it, I don't think Ian made the cut..?
Tim
-- In the immortal words of Ned Flanders: "No foot longs!" Website @
That's me, and Rich Grise. If you don't shape up, you're gonna have to ship out! :-)
See below.
-- ----------------(from OED Mini-Dictionary)----------------- PUNCTUATION - Apostrophe
The solar engine illustrates the use of sub-microamp techniques. You could use it to drive a step-up inductor in place of the motor, or to gate the V-boost circuit. Feed the solar engine from a small solar pannel coupled to a tritium light source using clear silicone. (120uH is correct)
sIn article , snipped-for-privacy@outerspace.org mentioned...
Yeah! That's the one! I remember seeing that quite a while ago, but I didn't have the URL bookmarked.
This is what I'm trying to make. I didn't realize that he used only a .1 F capacitor. I was going to use a whole farad, maybe more. The 1F
5V supercaps are $2.79 at Mouser, which is more than a dollar cheaper than Digi-Key. I could use a couple in parallel.I'm not sure why the guy used and inductror in his Infini-Flasher. I didn't, and my flasher works just fine, and only draws 100 uA average.
My guesstimate is that it will run for a couple hours per charge. But that assumes no leakage in the 1F capacitor. But I don't know if that's true. From what I find about regular electrolytics, large ones in the 100,000 uF range have several milliamps leakage, so that would be much greater than the flasher current, and so, might reduce the running time greatly. Knowing this leakage would help me plan on how many caps to order and use. Saves my time, too, since I wouldn't have to cut and try over a period of days to find out.
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In article , snipped-for-privacy@hotmail.com mentioned...
But how long do you have to wait between motor operations? At that rate, it might take a lifetime to move the robot across the room!
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WAIT TIME IS DERERMINED BY THE SIZE OF THE CHARGE COLLECTION CAPACITOR. fOR led APPLICATION THE CAPACITOR WOULD BE SMALL. SINCE WE DON'T WANT TO DELIVER TOO MUCH POWER TO THE LED.
Apparently a crystal radio receiver with a very long antenna can supply enough power to run transistor circuits and therefore an LED using a boost circuit. See:
Stepan
I used to live near an AM radio station. A long wire, an LED, and a ground was all that was needed.
People who live under high tension power lines could probably drive several LEDs from two sheets of aluminum foil on their roof :)
How about during a lightning storm? Warren
Wow, now that's pretty bizarre. Tin foil caps for a house. :-P
[snip]A neon bulb between the spokes of an umbrella and the main shaft works well too, when you are walking under power lines.
Stepan
Earlier, I was coming back from lunch at work, and right next door is a local radio station with two large transmission towers. Lightning was flashing through the sky, and twice I heard the telltale crackling of electrostatic ionization... I think the charge must have been jumping across the insulators used on the guy-wires holding up the towers. First time I heard it, I shrugged it off. Isn't those things grounded? Second time, I knew it was coming from the towers.
Brazzzap-crackle-crackle... :)
Certainly. A power company in northern Arizona sued some indians who ran an insulated fence along the ground under some high tension transmission lines. They powered lights from the fence for free Ghost.
Some nice tritium light sources that could be coupled to a solar cell using optical gel.
A thesis on the conversion of mechanical vibration to electricity. I suppose this means that the old "sound powered" naval microphones would work if a step-up transformer is used. Here the thesis:
You can use a peltier junction array out of a 12volt electric camping cooler. These seem to have a higher output than most thermocouples: See this link for an example product that uses a peltier junction:
In article , snipped-for-privacy@hotmail.com mentioned... [snip]
From what I've read, the thermocouples require a difference in heat to work. You have to have one end cooled by a heatsink. So part of the problem is to connect a couple of them in series to get a higher voltage, but still insulate them so they don't short.
And then there's the problem of getting a hot enough source of heat to give the needed voltage. I was checking for efficiency and found this. I assume that this efficiency is more than a standard thermocouple found in commercial appliances.
RTG Module Fuel mass 250WT Voltage 28V Power 20.5W Mass 2.2kg Specific power 9.4W/kg Thermocouple type Silicon-Germanium Thermocouple efficiency 7.6% Number of thermocouples 8 Fuel pile PuO2/Iridium/Graphite
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I remember Lucas in the UK developing a thermopile system for car battery charging where the thermopile fitted round the car exhaust, they never produced it because a significant market was alternators / dynamoes and the business case didn't add up. Probably wouldn't work now becasue of the need for a hot exhaust with catalytic converters.
Silicon-Germanium? Thats a Peltier device more than a thermocouple:
Quote from above URL:
------------------------ Narrow band-gap semiconductors are generally used for cooling and for power-generation applications.(9) Most Peltier coolers are made with alloys of bismuth telluride (Bi2Te3), antimony telluride (Sb2Te3), and/or bismuth selenide (Bi2Se3), the best materials to date for near-room-temperature operation. At higher temperatures, lead telluride (PbTe) is used. For power generation systems, which typically operate at still higher temperatures, silicon-germanium (Si-Ge) alloys are often used.
Real tree-hugger bait that, not to mention a bit difficult to get :-)
Try asking for PuO2 and the force *will* be with you!
-- Then there's duct tape ... (Garrison Keillor)
In message , Mjolinor writes
I would have thought it would work post cat.
-- Clint
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