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Forum Index : Windmills : Need some help with mini windmill
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| Robb Senior Member  Joined: 01/08/2007 Location: AustraliaPosts: 221 |
The 4 huge diodes could be wired as a bridge rectifier most likely. You realise a bridge rectifier contains 4 diodes in a single device. http://en.wikipedia.org/wiki/Bridge_rectifier |
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| jeen Newbie  Joined: 06/07/2008 Location: Posts: 11 |
My very first home made full wave rectifiers :) She aint gonna win any beauty contests but it works and thats what counts. 
Got it all wired up with a 13 ohm resister. Not too bad, atless I can hand crack the stepper to turn the other black motor :) Im using the 220uf 35v cap. What does it do if I use 560uf 200v cap instead? |
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| Dinges Senior Member Joined: 04/01/2008 Location: AlbaniaPosts: 510 |
Looks good. I don't think the 13 ohm resistor is really needed here, you probably lose a lot of your preciously generated power in it before it gets to the little fan motor. It'll probably work better without the resistor. As far as using the 560u/200 V capacitor goes, I don't think it will make much difference, but the only way to be sure is to try it out and see for your self. Somehow, I think Radio Shack's shareholders aren't as excited though... |
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| Robb Senior Member Joined: 01/08/2007 Location: AustraliaPosts: 221 |
The bigger cap will store more energy. Thats about it. You could always use both [or more]. Its the same over here at some shops. I bet Dick Smith the man is peeved at what they'v done to the shop that bears his name. I went in to a mobile phone store and asked: Have you got a phone with an external coaxial conector for RF out. Answer from shop person: Whats RF? 
What is the world comeing too. |
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| jeen Newbie Joined: 06/07/2008 Location: Posts: 11 |
Bigger caps it is then. Looks like im gonna have trouble getting the mill to turn with what little wind i get in my area. I took the motor with the propellers on outside a couple of times, it just aint blowing hard enough to turn :( Too much cogging? Im refusing to go back to my local radio shack to pick up the battery holders  |
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| Dinges Senior Member Joined: 04/01/2008 Location: AlbaniaPosts: 510 |
There still exist some good electronics part stores, you just have to look hard for them. Try to find an old mom & pop kind of store where the owners help you. Avoid the Radio Shacks, Conrads, etc. if you can. I know of one such small store (50 km away from me in Breda). The owner is a lady in her late sixties. It's a small store but filled to the brim with goodies. What they don't have they can order. She'll gladly order a $0.50 part for you if you need it. When the other clerks see me walking into the store I see them cringe (after 30 years of scrounging parts, I now have a pretty good supply of parts. If I need to buy something it's usually an exotic part they can't simply pull out of one of their bins :) ) Needless to say, this lady and her store get all of my business. Try to find such a store if you can and you won't regret it. And enjoy them while they still exist, as they're becoming rare (at least over here). Robb: a cellular phone salesman who doesn't know what RF is. LOL. But can't say I'm surprized. Maybe you should have tried to educate him: 'you know, back when you were a kid, when you made a telephone out of 2 tin cans and a bit of string ? Well, RF is the modern string. Invisible too.'  |
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oztules Guru  Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
Peter, I'm sure we are still using a piece of wet string and a clam shell here.... at least thats what I thought last night. Tried to ring the neighbour (3kms as the crow flies) to let him know his LCD screen was fixed, and had to try three times to get a line we could actually converse over. Whats RF????... oohhh, thats what the electric fences emit to punctuate our conversation. Gonna try tom toms next time..... .......oztules Village idiot...or... just another hack out of his depth |
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