Hand crank generator 12v 6w,homeland security jobs new york city,camping survival backpack amazon,vehicle identification reader gratis - Tips For You

09.08.2014
You must have JavaScript enabled in your browser to utilize the functionality of this website. We've got all your Science Materials, Science Supplies, Science Supply and Kids Science on one website! We are always thinking about ways to improve our circuit boards activity set so that there are interesting components that can also survive the wear and tear of the museum floor in a semi-facilitated environment.
But yesterday I went to IKEA and saw a huge-o bin of these LJUSA hand powered emergency flashlights. I started by prying off the top of the flashlight with a utility knife and a tiny screwdriver.
While this was an interesting phenomenon to us, we thought that it would be too confusing for someone just starting out learning about electricity.
I was nervous that prying off the bottom part with the handle would wreck the device, but I went ahead and tried it anyways and was relieved to see that the handle was just press-fit on the gears with a hexagonal connection.
One thing that I was confused about was that the motor had three wires coming off of it and the circuit board somehow turned that into just two wires (labeled positive and negative). However, once we tested it with a wide variety of circuit boards, we noticed some strange things. This makes a bit of sense to us (although none of us as a solid grasp of how electricity really works) because a light could be powered with pulses in each direction, but a motor couldn't spin if it was constantly getting equal pushes in opposite directions.
The next step may be to add a diode to the system which may limit the current to only going in one direction. So, there is still potential for the LJUSA to be a part of our circuit exploration set, but more experimentation is required to make it work the way we want it to and interact well with all of the other conponents. If you want a DC source, you should just unsolder the supercap (and keep it for other things, they are not cheap). Our gallery is next to a collection of electricity exhibits designed to teach different concepts and after reading your comments a few of us went and checked out an exhibit on hand cranked generators. It would be nice to have that close by if we do have generators with hidden parts in the Tinkering Studio so that if people get interested in the idea we can show them the inner workings of the model.
The big resistor will burn about a third of the power, with the rectifier and small resistor it becomes about half the power, the rest is used by the LEDs.
If you only want the DC output without the resistors and capacitor you can remove the capacitor and short out the resistors (replace the resistors with a piece of wire). Thank you for the kind offer, we would love to field test a couple of your generators if you're willing to part with them!
CAPTCHAThis question is for testing whether or not you are a human visitor and to prevent automated spam submissions.


The Tinkering Studio is located inside the Exploratorium, the museum of science, art and human perception.
A MUST read before you purchase an RV… Q & A on the best questions to ask when buying an RV! This pistol grip style handle generator can be utilized with almost any experiment requiring up to 12-volt DC current. These are geared down motors with cranks that can subsitute for batteries and show how rotational motion can be transformed into electricity. I bought one and at $4.99 and figured it would be worth seeing if I could hack it to make a hand crank generator to try out with our circuit board set. I cut off the button and attached the two protruding wires to alligator clips to see what would happen. However, once we stopped turning the handle, the light or mechanism kept working, although dimmer and dimmer or slower and slower. So I decided to see if I could remove the circuit and find out how to make the crank directly power one of our outputs. I also discovered that there was a little circuit board with a battery (rechargable?) on it and some other components that looked like resistors and capacitors.
I color coded the wires and tested it out with a light bulb and figured out which two of the three worked together to power the bulb. I ran the two wires out little holes that I drilled in the clear cover and added alligator clips to the ends.
We're not sure how this might affect the generation of electricity but we'll find out! There is one resistor in the circuit (the gray thing behind the cap), maybe there to limit the charging current. Or just live with the fact that generators usually generate AC and develop your activities around that.
It wasn't obvious to me, but I'm glad that I could use the materials around me to come up with a similar conclusion. I think kids being surprised, playful, and excited with new ideas is part of the activity, but I agree that it's nice to have resources available to follow up if people want to continue their investigation.
But as Florian said, if you want direct feedback from the crank just remove the capacitor (and save it for something else). So a bit less than half of the "crank power" is turned into light (since generator and leds are not 100% efficient either). We usually use something like the ones above for workshops, but they tend to not be robust enough for the museum floor.


We realized that this was because the flashlight was meant to be spun and then powered on for a set period of time. It also seemed to work either way with the piezo buzzer (which usually only makes a sound when connected in one direction. I think with what we learned from experimentation and other commentators you are right, it's a super capacitor. Yeah I also wondered how robust the mechanism would be over time with the kids at the museum but I didn't think about how it would withstand different levels of current. Diodes D1 to D4 are equally obviously a classical rectifier circuit, and one of the other diodes will probably be a Zener to protect the supercap against overvoltage (they are quite sensitive to that).
Handing kids a generator that outputs DC sort of trains then not to understand generators and use them as a prefabricated magical devices instead.
I think we'll get a couple more of the IKEA generators and experiment with just de-soldering the super cap. DC is then fed into the super capacitor (5.5 v, 1 F) via the large (20 ohm) resistor, presumably to limit the current. We figured there was some sort of capacitor or other circuit board inside the bottom half making it do that. I am not quite sure what the remaining diode is for, maybe to protect the cap against reverse voltage from the output terminals. Then they will be surprised if they encounter a real, bare generator and it cannot drive a motor, like the author of a blog post I read recently. It would be nice to have a couple different types of generators available so that visitors can see that they're not all the same and test out the difference in behavior. The capacitor is then connected via a smaller 2 ohm resistor to the 3 white LEDs that are connected in parallel.
This generator can also be used as a hand generated flashlight due to the mounted lamp on the end or use the binding post to connect an outside electrical circuit. I wonder if there's some way to reconfigure the other elements so it works on DC but doesn't remain on after being spun.



Storing food in stainless steel containers wholesale
1965 ford mustang vin number search net
9 digit vin number decoder online


Comments to «Hand crank generator 12v 6w»

  1. KickBan writes:
    Food, guaranteeing meals safety, and discovering sensible, sustainable the effects of an EMP is about.
  2. KARATiSKA writes:
    Just simply add boiling and oxygen into.
  3. ell2ell writes:
    Trees (or poles) till there is enough materials to boost in, is what we consider will.