9Vs and Fan

[aeioa]

Hi, I'm new to the Hardforum, and new to hardware in general, also T-T.

Yesterday I wanted to undergo an "experiment", per say.
I have a Nidec TA350DC, model M33503 (which doesn't happen to be on there ), and two 9V batteries.

I figured that since the fan took 12VDC, I could just connect the two 9V batteries to get 18V, and then connect the fan's hot and ground to their respective terminals on the battery. However, that wasn't the case.

When I test the two batteries connected to together, I am getting just about 16V from it. When I connect the fan to it, I get 2V.

Also, when I connect the fan to only one of the 9V's, I see the fan move a little, and it sounds like it's trying to spin, but it can't because I assumed it wasn't getting enough voltage...however, when I connect the batteries together, and connect the fan, I get nothing. No movement of the fan, or sound, or anything.

Just looking for some general help as to why this little experiment isn't going the way I planned

Thanks

 

[Spewn]

I would imagine that the fan is trying to draw way too many amps when compared to the number that a pair of 9v batteries can put out.

 

[aeioa]

You are right about that, I didn't even bother to check the current; the 9V is only giving me 40mA, and the fan needs .4A.

I don't understand why, when I connect both the batteries together, the current _drops_, instead of rising, though (it drops to around 3mA).

 

[Mad_Pyro]

Wire the batteries in parallel and tell us what you find.

 

[aeioa]

I wired them in parallel to find that the voltage was about 9V, and the current is around 50mA, as opposed to 40, or dropping to 3, but the fan still doesn't spin.

Mad_Pyro: were you telling me to do this to show me that the currents will add, or were you planning on the fan working?

 

[wayne]

Also, when I connect the fan to only one of the 9V's, I see the fan move a little, and it sounds like it's trying to spin, but it can't because I assumed it wasn't getting enough voltage...however, when I connect the batteries together, and connect the fan, I get nothing. No movement of the fan, or sound, or anything.

ive tried wiring one fan to a 9v battery... it looks like its trying to spin, but stops suddenly, rite?
if so, just give it a little push/spin in the right direction and it should spin

but if u plan to run fans off 9v batteries for a long period of time, its not going to last long and its expensive because u have to pay for a lotta batteries

 

[aeioa]

wayne: no, I wasn't planning on running this at all except for a few minutes, just to see if it worked

 

[defcom_1]

the current draw is way too high for what the batteries can supply. Dig for more information at www.dansdata.com, he goes into some detail about current draw and battery life in his led flashlight articles.. (mostly the little watch battery ones)

 

[Format _C:]

if you just want to it. Be care not to short out the psu take the red wire and put it in the yellow slot on a free molex and the black wire in the black slot on a free molex

 

[wayne]

wayne: no, I wasn't planning on running this at all except for a few minutes, just to see if it worked

so just give it a little push...it should run after that

i ve done it before so i know
and then i connected a 1.8v red LED just to see if it can take that high voltage.... after trying 1.5v, 3v, and 4.5v
R.I.P. my first led....