Discussion in 'Article Discussion' started by Koolvin, 20 Sep 2001.
LOL.............like the trousers dood !!!!
Seriously though, good article. If I'd had more common sense I'd have built a rheobus when doing my case.................still at least my uni room this year is very cold anyway hence less need for collance and NOISE!!
TBH the best bit is the relatively cheap price, good to see at least one place not trying to rip modders off!!!
Do you guys think that this thing can handle a YS-Tech 120mm 135cfm fan? Excellent write-up by the way!
these are rated to 5W, on each rheo so I guess that they should work with some 120mm fans ...
the 120 Panaflo H1A is rated at 5.25W so they might blow the rheo ...
the 120 Panaflo L1A is rated at 2.16W so thats ok.....
the YS Tech 120 mm Fans (25mm thick) are rated at 5.25
Spike, I'm looking at a YS-Tech 120x25 now and it's definetely 3.48W - I think you must mean the 38mm thick version.
I really want to put a rheobus in my next case, but I want to do it completely DIY - that is I wann buy all the separate components from RS or maplin and whack it together myself...but I can't find any rheo's at maplin...could someone tell me where I can find them ?
Search for 'potentiometer' in their keyword search..
Maplin code FX97F good for upto 10-12Watts of fan.
yeah ... thats what i meant
doh, I tried that before but spelt it 'potentiohmeter' and it found nothing...silly me
Is that what you used ?
most of the rheo's at maplins seem to be rated around 0.4W - but that's for 500V - how can you calculate what they could handle at 12V ?
I tried messing around with power laws but got a silly answer
Yes I have used them before. They will run slightly warm with some fans such as the 80mm Delta screamer.
As a rule of thumb, for typical 12V dc. axial fans, the maximum power dissapated in the rheostat will be 1/4 of the fan power.
The above pot is rated at 3.5W therefore 10-12 W fan load is a reasonable maximum load.
The power in a dc circuit = V x I. Remember as the pots resistance is increased so the voltage to the fan is reduced, (slowing the fan), thus decreasing the current. This is often overlooked when trying to find suitable pots to control fan speed.
Hope this helps.
my 120*38mm YS-Tech's was rated at 8.52w
the ys tech web site wasn't very easy to understand .... your prolly right
If you want your custom made rheostats baybus to handle more load without overheating you might consider using an LM317 voltage regulator. Here is a full write up for those of you who might be interested without the restrictions that the CaseETC kit provides:
Bit-Tech's new writer ::nox|silicon:: has already written a guide on how to build a Rheobus using LM317's
Cheers pveale! here's the link : http://www.bit-tech.net/?page=article&id=80
Glad you like my trousers (shorts actually, but ne'er mind )
If it's any help (I know nothing about fans, power etc) I've got a Sunon Low Noise 120mm on the Rheobus with no problems at all. The only thing is, you have to turn the rheo up to a certain level to get it to turn on, but you can then turn it back down again once it's started (presumably bigger fans need more power to start up than they do to run??!)
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