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Temperature control of small 12V fan | 32 comments (32 topical, 0 editorial)

Re: Temperature control of small 12V fan (3.00 / 0) (#22)
by s4w2099 (movlw0x13h@yahoo.com) on Wed Aug 6th, 2008 at 12:14:07 PM MST
(User Info) http://www.s4wsbox.com/

hmm tecker,

There is no reference connected to 7812. The reference is taken from the VREF pin generated from the tl494 itself. I think you have it all wrong. This is not supposed to boost based on voltage read from the battery.

It should boost based on the current seen into the batteries.

Read this: to clear it out a bit: http://s4wsbox.com/?q=node/32

I attempted to explain there how it works.

[ Parent ]

Re: Temperature control of small 12V fan (3.00 / 0) (#23)
by tecker on Wed Aug 6th, 2008 at 02:05:42 PM MST
(User Info)

I'll do that. http://s4wsbox.com/?q=node/32 crashes

[ Parent ]

Re: Temperature control of small 12V fan (3.00 / 0) (#24)
by tecker on Wed Aug 6th, 2008 at 02:06:45 PM MST
(User Info)

Ok I got it to work

[ Parent ]

Re: Temperature control of small 12V fan (3.00 / 0) (#28)
by tecker on Wed Aug 6th, 2008 at 08:11:46 PM MST
(User Info)

Vcc is the voltage reference no doubt there . Your error comparing that to the voltage from the allegro .That's a nice choice there . I like lean circuit designs . I'll buy one and run it through it's paces . Rather than go on as negitive input .

[ Parent ]

Re: Temperature control of small 12V fan (3.00 / 0) (#29)
by s4w2099 (movlw0x13h@yahoo.com) on Wed Aug 6th, 2008 at 09:29:32 PM MST
(User Info) http://www.s4wsbox.com/

Tecker, I ran out of them a while ago, here is a cache from google of that page with the message dated July 10th.

http://74.125.45.104/search?q=cache:m6Z7WI0vCU4J:www.s4wsbox.com/%3Fq%3Dnode/33+site:http://www.s4ws box.com/&hl=en&ct=clnk&cd=15&gl=us&client=firefox-a

If you think its so bad I invite you to put it together properly (good layout) and test it. I dont force ppl to buy it or try to convince them about it, thats the reason I give schematics. You dont want to buy it or skeptical you have the map to build it and test for yourself. I have no plans to make a business out of it either, I posted it free for all.

[ Parent ]

Re: Temperature control of small 12V fan (3.00 / 0) (#30)
by tecker on Thu Aug 7th, 2008 at 05:33:55 AM MST
(User Info)

I understand I like the idea .I'm not tring to be an a hole . I 'd like to expand this if the loops are sound .

[ Parent ]

Re: Temperature control of small 12V fan (3.00 / 0) (#31)
by s4w2099 (movlw0x13h@yahoo.com) on Thu Aug 7th, 2008 at 06:53:32 AM MST
(User Info) http://www.s4wsbox.com/

I see, This works fine but its not MPPT it was not my idea actually but Flux's. I was just the one that actually implemented the idea and got it to work after Flux.

I wont be making this one anymore, I will be replacing the tl494 with a small PIC and go MPPT all the way. Sure it will have to be more expensive as there would have to be much more protection for the micro, the 494 is a tough IC.

I have to finish older projects though.

[ Parent ]

Temperature control of small 12V fan | 32 comments (32 topical, 0 editorial)

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