# COMMUNITY : FORUMS : TECH

## Cheap Power Conditioning Unit (PCU)

In the video released by the windbelt creator, he mentions that his PCU only costs about a quarter. I dont know if that is his mass produced price, or his off the shelf price, but does anyone have any ideas about how to make a PCU for say, under a buck?

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guyfrom7up10 years ago
NEW PRODUCT LIST AND COST IN THE ORDER OF 10K 4x low voltage drop schottky diodes 34.8 cents 2x Ferrite Beads to be determined, probably around 10cents magnet wire a couple of cents capacitor 2 cents or less If anybody knows how to connect the 2 coils that are near the fluttering magnet in series while it's still AC the Cost of this whole thing will be about a quarter
10 years ago
> how to connect the 2 coils that are near the fluttering magnet in series . This should be easy enough to do by trial and error. One way should put out more voltage than the other way.
9 years ago
If the 2 coils have exactly the same number of turns and the magnet at rest is exactly at the centre of the coils(put 2 thin magnets on either side of the belt to allow centering) then : One way will give NO output (as the 2 voltages developed are exactly reverse) The other way will give the maximum. If there is an unbalance there will be one way giving more than the other To maximize PEEK Voltage use only one Schottky Diode(I.e. Charge a Condensor) To maximize PEEK Current use a Bridge of Sch. Diodes(Charging one NiMh) I am waiting for ordered magnets to experiment with it instead of the Hard drive system which is not as efficient due to the length seen by the assembly constantly changes ,marginally but I think (it happens) that it is significant.
10 years ago
yeah, I was talking to fafnir and we're just going to do trial and error. My biggest concern is that the AC sine waves are 180 degrees different than eachother and when you hook them together no current will flow.
chestnutc10 years ago
Does anyone know how to build the wire coils? I am building the windbelt for a research project for my science class and I am finding that making the coils is the hardest part. Any suggestions?
10 years ago
Just so you know this isn't a super simple thing. The principal is, but how everything worksisn't. right now we're trying to engineer the power supply because you can't use the voltage as is. I'm going to be just using a n old bobbin and a sewing machine so that it winds a nice compact coil.
10 years ago
What size gauge are you using?
fafnir665 (author) 10 years ago
After some research and a lot of pointing in the right directiong by guyfrom7up, my parts list is as follows:
Um, incomplete, I cant find the max1709 chip he recommended, though its priced on one site as 3.79 each for 1000
soo,
4x Diodes at \$0.65 each, \$2.60
1x Capacitor at \$1.09 each, 1.09
1x max1709 at approx \$4, \$4
so about \$7.79 which is waaaaaaay more than a quarter.
10 years ago
You might be able to get them to send you a sample eval kit: Maxim's max1709 Eval Kit sample and documentation
10 years ago
Ask for a sample of the Maxim IC. Cost == \$0

A 1N4001(50v) cost == \$.04 (25/\$1.00) here... Sure, shipping is more but that wouldn't be factored into the "quarter estimate." Just try to anticipate all your parts needs for the next couple months ;-) , and order everything at once. The 1N4001 might even be overkill for this project, look for something with < voltage drop (they have small bridge rectifiers, too.)

And you must have some junk, non-working electronics. I get almost all my caps for free.
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