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Home / I-Opener Areas / I-Opener Technical Stuff Holy Cooling solutions batman!! A lasagna for $3.25?

Holy Cooling solutions batman!! (modified 0 times) GWIZAH Profile | Email Ok, I was searching for something totally unrelated when suddenly I came across this Ok so is this what I think it is? A lasagna cooler for just $3.95??? Check it out! 04-05-2001 08:21:32

RE:Holy Cooling solutions batman!! (modified 0 times) Perplexer Profile Spinning fanblades, Robin! It's a Lasagna fan all right, but it appears to be the 12V variety. I don't know if Tennmax's 5V Lasagna fans are the same exact model just running on a lower current. You could probably get away with running that 12V fan at 5V. It would not be as effective, but would be quieter. I wish I'd known about that earlier; I needed a low-profile HSF for a tower PC and ended up using my $25 5V Lasagna. $4 is cheaper than most other regular-size socket 7 fans! Other neat stuff available from that company too... 04-05-2001 09:33:56

RE:Holy Cooling solutions batman!! (modified 0 times) JohnQPyro Profile This is how cheap I am.... Anyone know how to convert these to the 5V Variety ?? Juat a thought. JohnQ 04-05-2001 09:55:33

RE:Holy Cooling solutions batman!! (modified 0 times) BadFlash Profile | Email You can get a 5V to 12V inverter, this might work http://www.allelectronics.com/cgi-bin/category.cgi?category=200&item=DC-32&type=store, just guessing, but 10V should make it run. 04-05-2001 10:46:04

RE:Holy Cooling solutions batman!! (modified 0 times) eddavis Profile What problems might pop up if you ran it as is at 5v? 04-05-2001 12:55:42

RE:Holy Cooling solutions batman!! (modified 0 times) JohnQPyro Profile eddavis, Likely it would fun fast enough to coll properly. BadFlash, Thanks for the Idea, I might give that a try. They are pretty cheap. More money, but I may also just stick with the 5v TennMax Fan.. Less hassle. JOhnQ 04-05-2001 13:43:11

RE:Holy Cooling solutions batman!! (modified 0 times) Glitch Profile GWIZAH: Great find! MPJA also has a DC-DC converter that should work perfectly with the fan. The only thing that I don't know for sure is if the serial port can provide enough current to power this. http://www.mpja.com/product.asp?product=7821+PS This has a 200ma output. I just measured a 12v Lasagna fan at 9.3 volts. It pulls about 34ma. The fan starts consisantly at 9v. The starting threshhold is in the 5-6v range (depending on the individual fan). I would not trust running one of these fans at 5v. The best thing about running the fan at 9v is that it is about half as loud as at 12v. I've been "undervolting" fans for years without any problems. The only drawback is that you give up a bit of cooling capacity. If you plan on overclocking or running a known "hot" CPU, buy one of the Tennmax i-Opener specials. This is one of the best solutions out there. If not, you can't beat the price of this pair of parts at MPJA. Glitch Electronics run on smoke, if you let the smoke out they won't work 04-05-2001 15:45:23

RE:Holy Cooling solutions batman!! (modified 0 times) Linuxguru Profile | Email You should be able to run any DC motor at a lower voltage. It will run slower, quieter, consume less current and last longer. In the case of the Tennmax fan, its cooling capability would also be reduced. 04-05-2001 15:49:45

RE:Holy Cooling solutions batman!! (modified 0 times) eddavis Profile Glitch, regarding: 5v to 9v converter, that shows a part made by Valor, P/N PM6039. I saw this and said "that looks familiar.....". The text says it's used in LAN systems, and sure enough I have an old NIC with a 5v to 9v converter (Valor P/N PM7202) on it. It has 8 connection points on it, though from what I can tell, I can't tell much. Anyone have specs on this? I'd be interested if the io can handle it - doesn't seem like too much of a load. 04-05-2001 17:02:55

RE:Holy Cooling solutions batman!! (modified 0 times) Glitch Profile eddavis: I've done a brief websearch for documentation on the Valor 5v-9v converters and came up empty. The main website seems to be http://www.valorinc.com/ . This must be a discontinued part. All my newer NIC's have a different style device on them. I did find an old 3COM card which has a Valor PM6027. I will plug it in and probe the pins with a multimeter. It shouldn't be too hard to figure out how it works (famous last words <g>). I'm hoping that the MPJA devices have some documentation with them. If not, it's either back to the web or get on the phone and call Valor. Glitch Electronics run on smoke, if you let the smoke out they won't work 04-05-2001 17:46:04

RE:Holy Cooling solutions batman!! (modified 0 times) Glitch Profile eddavis: One more thing. I believe that most of these devices are fairly effcient from power in to power out. Since the i-Openers can handle the 5v Lasagna fan I'm pretty confident that they will be able to the DC-DC conveter/12v fan combo. I plan on measuring the the current draw on the bench just to be safe. Glitch Electronics run on smoke, if you let the smoke out they won't work 04-05-2001 17:50:01

RE:Holy Cooling solutions batman!! (modified 0 times) 02U2 Profile Great find on these GWIZAH...I ordered 5 today. Plan on using them as spares for i-Opener ala mobile GPS. A hot summer may take it's toll on these fans... Unless I'm mistaken there is no 12v on the i-Opener so I'm going to install and tap a 7812 V reg in line with 18v input voltage connector on the i-Opener and run fan from the 7812 output. Thinking about using a transistor switching curcuit inline w/7812 to sense +5v on i-Opener when powered up. i-Opener powered down switches power to 7812 off thus fan off. 04-05-2001 20:47:07

RE:Holy Cooling solutions batman!! (modified 0 times) 02U2 Profile Hmmmm,Sorry guys It's late for meeee....been up since 2am.... 04-05-2001 20:49:38

RE:Holy Cooling solutions batman!! (modified 0 times) WanneBe Profile I tried a standard 486 12V fan on the serial port 5V. There's wasn't enough current to break the static friction and start the fans turning. A flick with my finger and the fan would turn. It looked like it needed about 7v to get started. Two fans in series off the input 19V works. The second fan could be used to blow air on Q16. I finally got rid of the thermal shutdown (or at least pushed it beyond the previous 1 hour limit ) with a K6-3 AFK at 300MHZ. I got tired of spending money so I used 2 pairs of surplus fans in parallel. Two blow on the stock heat sink through the vents on the plastic case and two blow air through the memory door. A manual switch turns them on/off. Looks like crap; but, as long as I'm in front of the screen, I don't have to see it :). 04-05-2001 22:17:31

12 Volts on board (modified 0 times) KneuB_2 Profile | Email There are several threads mentioning that there is 12V on board. Here is one that talks about running these 12V fans from a 12V source already on board. 04-05-2001 22:17:46

RE:Holy Cooling solutions batman!! (modified 0 times) 02U2 Profile Thanks KneuB_2,I remember that thread now. Ok I think will just connect the 5v "sense" of the transistor switching circuit to cn12. This way there will be a switched 12v source for the fan. Glad it's FRIDAY! Didn't get much sleep last night...Started with a noisey Police helicopter circling overhead my block for quite awhile while ground troops with K-9's going door to door, yard to yard looking for a nasty burglary suspect. Was kinda interesting to listen to them carry out there sweep on the 800Mhz uniden "Trunk tracker" scanner. 04-06-2001 04:04:06

RE:Holy Cooling solutions batman!! (modified 0 times) humanoid Profile They also have them at All Electronics http://www.allelectronics.com/cgi-bin/category.cgi?category=search&item=CF-100&type=store $4.50 each with a flat $5.00 shipping fee. Might be cheaper if you're getting a few of them or need other parts. Dumb question - what would be wrong (other than the aesthetics of having another wire running to your iopener) with just running 12V from another AC-DC transformer to power the thing? Sean 04-06-2001 07:54:00

RE:Holy Cooling solutions batman!! (modified 0 times) Steve Profile | Email O2U2, could you give more details on how to have the 12V only come on when the unit is turned on. 04-06-2001 08:02:26

RE:Holy Cooling solutions batman!! (modified 0 times) Epsilon1 Profile Here, From 02u2 http://www.ednmag.com/ednmag/reg/1997/092597/20di_04.htm#Figure 1 04-06-2001 08:40:36

RE:Holy Cooling solutions batman!! (modified 0 times) BadFlash Profile | Email If you feel like really hacking and going cheap, get a 555 timer set up in astable mode and hook the output up to a simple diode-capacitor voltage doubler. This will give you 10 Volts and will run the fan. Cost would be about $2 for parts from rat shack. If you really want to go nuts you could make it a trippler and add a 12V regulator to it, but that would be overkill. 04-06-2001 09:27:46

RE:Holy Cooling solutions batman!! (modified 0 times) mp3boombox Profile | Email In case any of you guys are intrested I'v got 2 more of them 1"x1"x1cmhig 5v fans for laptop's they are VERY low power using and do an exelent job. You can put it on the inside of the case of the IOPENER below the speaker like i have done. OR you can put the fan over a heat synk like the tennmax. I suggest my method because its both VERY quite AND EXTREAMLY effective!!! 525mhz OC with q16 chip stil and My cpu is only runnin 119f and mother board is running 138f WITH a speical heat synk on the q16 BUT in any case it works AUSOM!!! WANT PICTURE I'll send you some. 04-06-2001 14:21:14

RE:Holy Cooling solutions batman!! (modified 0 times) GWIZAH Profile | Email How exactly does that mod work? The fan is not on a heat sink according to your post, then how is it cooling the processor? I'd like to see some pictures of that. could you send em or post them up?? Thanks! BTW, I wish the board had a spell checker too 04-06-2001 14:27:35

RE:Holy Cooling solutions batman!! (modified 0 times) mp3boombox Profile | Email basicly the fan is on the side and the air is channeld onto the processor, and KEPT ON the heat synk via a cover over the TOP and sides of the heat synk. thus all air must travle thew the ehat synk. and thats who know's how many little heat synk rods at about 1.2cm tall where the tennmax heatsink/fan setup only has heat synk parts around the outside. of the fan, basicly my setup has about 20x the amount of surface contact that the tennmax has. ;) 04-08-2001 08:08:18

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