Educational toys

Author Topic: Educational toys (Read 6602 times)

Vasik041	Educational toys « on: 2017-04-27, 19:30:32 »
Hero Member Posts: 915	Here I will post a few simple to build FE related projects. But it is not so simple understand how they work

Vasik041	Re: Educational toys « Reply #1 on: 2017-04-27, 19:41:39 »
Hero Member Posts: 915	How to build Kulibin's fountain (about inventor https://en.wikipedia.org/wiki/Ivan_Kulibin) kulibin.pdf (556.27 kB - downloaded 482 times.) Educational toys bottle.png (497.61 kB, 419x800 - viewed 915 times.)

Vasik041

Re: Educational toys « Reply #2 on: 2017-04-27, 19:44:14 »

Hero Member

Posts: 915

Gravity assisted battery

Quote

Under gravity influence concentration of salt in water depends on height same as air pressure
depends on height. If we insert two electrodes in the tube, one near top and one near bottom, due
to difference in ions concentration some EMF appear between electrodes and if we close circuit
there will be some electric current flow. In such buttery plus will be on top terminal and minus
on bottom terminal. If you turn it upside-down polarity will change. I think if we periodically
turn such battery upside-down, polarity will change periodically and we can control (reverse)
processes on electrodes and avoid chemical destruction. So, theoretically, such battery can have
quite long life time.

gravitybattery.pdf (73.58 kB - downloaded 435 times.)

Vasik041

Re: Educational toys « Reply #3 on: 2017-04-27, 19:46:37 »

Hero Member

Posts: 915

Flower Power – unusual battery design

Quote

Some years ago I saw an article in Nuts & Volts magazine where somebody used flowers as
power source. It said that if you connect one wire to the ground and one to the flower’s top
leaves some voltage appear and very small current can be obtained. This article puzzled me a lot.
It is not typical chemical battery like “lemon” battery which works similar to regular batteries.
I made some information search and to my surprise found that it is well known fact...

flowerpower.pdf (63.06 kB - downloaded 424 times.)

Vasik041	Re: Educational toys « Reply #4 on: 2017-04-27, 19:47:09 »
Hero Member Posts: 915	Perpetual blinker Combination of Joe Tate Ambient Power Module (http://www.rexresearch.com/tate/tate.htm) with LED flasher circuit. Educational toys aire.png (57.05 kB, 677x316 - viewed 885 times.) « Last Edit: 2017-04-27, 21:15:18 by Vasik041 »

Vasik041

Re: Educational toys « Reply #5 on: 2017-04-27, 20:32:14 »

Hero Member

Posts: 915

"Drinking" clock

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I think everyone knows about "Drinking bird" toy (https://en.wikipedia.org/wiki/Drinking_bird).
Here I would like present "modern", solid state analog
Take a Peltier element and put wet rag on one side and big heat sink on the other side.
Water will be evaporating from the rag and it will be cooling.
This creates small (about one degree) temperature difference for several hours.
Using modern DC-DC converter for energy harvesting (like LTC3108) some small electronic device can be powered e.g. clock.
I also believe that it is possible build similar system with "closed cycle" where water (or perhaps some other coolant circulate inside device).
This, however, presents much more serious engineering challenge.

Energy-Harvesting-power-supply:
http://www.ebay.com/itm/Solar-Energy-Harvesting-power-supply-w-LTC3108-and-super-capacitor-storage-/331974364829?hash=item4d4b36ce9d:g:tXwAAOSwmLlX4Osy

Peltier modules
http://www.ebay.com/itm/TEC-12706-12V-40mm-X-40mm-X-3-75mm-Thermoelectric-Cooler-Cooling-Peltier-Plate-/262034289314?hash=item3d0275f2a2:g:yHEAAOSw0JpV6aWQ

flwrclk.pdf (15.88 kB - downloaded 409 times.)

Educational toys

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Educational toys

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flwrclk.c.txt (2.95 kB - downloaded 383 times.)

Educational toys

dk.png (264.65 kB, 768x257 - viewed 938 times.)

poynt99	Re: Educational toys « Reply #6 on: 2019-02-04, 22:47:29 »
Group: Administrator Hero Member Posts: 3538 It's not as complicated as it may seem...	No telling what this kid will accomplish when his voice eventually changes. Scary kid! --------------------------- "Some scientists claim that hydrogen, because it is so plentiful, is the basic building block of the universe. I dispute that. I say there is more stupidity than hydrogen, and that is the basic building block of the universe." Frank Zappa