Solar 20'' Box Fan

[Basil]

Ok I am trying to post in my diaries for the first time on the new board. So if it's in the wrong place. Fill free to move it.
I am in the process of taking an older model Toyota car apart to get the motor and other parts to play with.
It ran good but smoked a little when you first started it. This was years ago when I parked it down by the lake in the woods.
 
Any way, I did get the motor out and on the ground. I ran out of time so I did not have much to bring home on the first day at it.
I did get the radiator fan. It had broken blades ( From years ago I would drive it in the woods) The fan motor still ran good.
I have a 20'' box fan that the motor went out in. Well, that car fan motor fit right in where the 120 volt motor was in the box fan. With a little work I got the box fan blades on the DC Motor.
The guards when back in place so you can't tell it's a DC Motor. The bad part is it pulled 8 amps at full speed. The good part it would blow your shirt off.
I have been using a heater coil to adjust the speed of my solar ceiling fan but I have advanced some since then. I have been studying how to build a PWM for my HHO project ( That's what the car motor is for) I had build a simple PWM to replace the heater coil on my ceiling fan but never put it on.
I tried it on the NEW Solar box fan. It is working great. I used a mosfet out of a TV and other parts out of anything I could get my hands on. PWM is really simple if you study them. I will try to add some photos if I can.

[hiker]

thought about building a hho canister for my f150-not sure on how many plates im going to use yet....
built a small hho canister a while back--just two small plates--pluged that into my batt charger..makes gas!!--about 7-10 amp draw..
watched a few u tube vids --they claimed anywhere from 20-50percent incress in mpg..
all depends on the number of plates you use--or some even use spiral wire-interlaced..some use plain water-others add bakin soda..
be careful if you do make one--damm things are dangerouse !! never new just how explosive plain water could be-and a little goes a long way........................................

[ghurd]

What circuit did you use?

I would be a little concerned about a TV fet with 8A.  Most are rated for high voltage and low amps.
At least put a heat sink on it?
G-

[Basil]

Hiker
I have built several types and sizes of HHO units. Different count plates and so on.
I tired different neutral plates count also.
It comes down to you have to play with it to get it at it's best with what you have. One is in a 5 gallon bucket. (Testing)
The plates are like 1 ft by 16 inches. It has seven plates + - + - + - +. It pulls around 100 amps.
Man It makes the gas. Yes, HHO is very explosive.
I am going to set the motor up with a Vapor / Woodgas crab. Two valves is all it is.
You can use that crab with HHO, gas vapor or Woodgas. I built a Woodgas gen out of a 55 gallon drum.
It works great. My plan is to run the motor with gas vapor and HHO mix.
I can't say anything about one in the f150 except. I heard that you can tune it down enough to damage the motor.

ghurd
 Yes, You are right but it was what I had to work with, and My first try at building a PWM.
2 resistors, 1 pot, 1 five volt (thing) 1 mosfet
I run it at 3 amps max continuously. Plus, I put at fan on it. I ran it several hours last night. ( 2 amps )
The bottom of the box was just warn. I have it laying on the bottom of the box.

[wooferhound]

This will be my next project too. I have an old fan with burnt out motor and was planning to use a treadmill motor like CmeBREW did.
(I can't seem to be able to find that story)
 He was claiming a really low current draw with the treadmill motor.

I was planning to build a PWM speed controller like samoapower posted
http://fieldlines.com/board/index.php/topic,128905.0.html
but you guys seem to be talking about an even simpler controller.

I also know of these other PWM speed control circuits . . .
http://www.aaroncake.net/circuits/motorcon.asp?showcomments=all
http://www.sentex.ca/~mec1995/circ/pwm555.html

[ghurd]

This will be my next project too. I have an old fan with burnt out motor and was planning to use a treadmill motor like CmeBREW did.
(I can't seem to be able to find that story)
 He was claiming a really low current draw with the treadmill motor.

I was planning to build a PWM speed controller like samoapower posted
http://fieldlines.com/board/index.php/topic,128905.0.html
but you guys seem to be talking about an even simpler controller.

I also know of these other PWM speed control circuits . . .
http://www.aaroncake.net/circuits/motorcon.asp?showcomments=all
http://www.sentex.ca/~mec1995/circ/pwm555.html

Hey woof,

Google "5000% efficient fan cmebrew".  Google sees it, but it must be semi-lost.  Which is strange because I looked at it a week or 2 ago.

I was at the shop a month ago tinkering with something unrelated to fans, but used the breadboarded PWM circuit for the box fan I posted.
It is not Samoa's circuit.
It is Tony van Roon's in the link above (sentex-pwm555), except MBR1645 was changed to a 3A 60V Schottky, and BUZ11 was changed to IRFZ44N.

Anyway.  Go for it!  Almost unimaginable the treadmill motor can turn itself with that drop of power, let alone spin the blades.
G-

Edit / PS-  It will not show up, but here is where cmebrew's fan "was"-
http://www.fieldlines.com/story/2007/3/10/23942/1876

[ghurd]

 Yes, You are right but it was what I had to work with, and My first try at building a PWM.
2 resistors, 1 pot, 1 five volt (thing) 1 mosfet

Basil,
I am not sure I follow what you did, but it sounds like some sort of linear regulator.
Best I can figure is the circuit runs the fet linearly.
G-

[Basil]

WOLF
If thats the story with the white fan on a stand made with a treadmill motor,
It was nice and did not use much power at all like Ghurd said.

Ghurd
I used a ( I think ) a 5k pot, 2 1k resistors, A 5 volt power ( thingey ) and the 8 amp mosfet.
All I know is it works.
I will sent you a lay out of how it's wire / made. Then you can let me know what it is.

[ghurd]

Please do!
The curiosity is killing me.
G-