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| Thread ID: 69280 | 2006-05-27 22:29:00 | Fan Cool Down Timer. | The_End_Of_Reality (334) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 458369 | 2006-05-29 05:08:00 | Wow... Mad scientists and geniuses the lot of you o.O | mejobloggs (264) | ||
| 458370 | 2006-05-29 05:10:00 | Wow... Mad scientists and geniuses the lot of you o.OLOL!! thats us :horrified :xmouth: :D | The_End_Of_Reality (334) | ||
| 458371 | 2006-05-29 05:27:00 | How're you gonna get them to co-exist on the same rails without some sort of interplay and cross-purposes? Breadboarding a circuit might be a poor idea. Isolation diodes come to mind, but we are not dealing with just sloppy guesswork..the voltages on the rails is very clean, purified and can cause all sorts of troubles with switching, diode gating and thru-leakage and then there's the danger of smoking the whole thing anyway. As stated in my first thread, we are using CMOS integrated circuits and a Opto Coupler to monitor the computer power supply, therefore any thru-leakage will be negligible. Our rough circuit currently shows power transistor output to the fans through a diode OR-Gate but in the final circuit these will be replaced with power Mosfets and CMOS OR Gates. Again isolation will not be a problem. BURNZEE |
Burnzee (6950) | ||
| 458372 | 2006-06-03 08:00:00 | I just thought I would update all who wanted... We have made a ONE-SHOT timer using a 7555 CMOS as Burnzee said, we are just testing the values out now. Also, when each stage is completed, I am going to put the circuit diagrams up on my server for all to see :) |
The_End_Of_Reality (334) | ||
| 458373 | 2006-08-12 03:45:00 | I'm pretty interested in the work that you guys did on this . I have a new cabinet that I stuck all my home theater equipment in that needs to be cooled while it is on and 10 or 15 mins after it is shut down . I figure I would stick a couple 12v fans in the top with some sort of timing circuit that could be triggered off of my Rotel processor . It sends out a 12v pulse as a "trigger" when it is turned on or turned off . I would probably use an AC to DC 12v adaptor that I have that is rated at 1500ma . Do you guys have a schematic of what you put together? Thanks!! |
Opoc (10464) | ||
| 458374 | 2006-08-12 05:09:00 | We have got a fairly sound idea, using an opto-coupler tio sense the 12VDC rail of the PC, logic gates, 7555 timers, and MOSFETS, to give the actual timing and supply enough current and an external PSU. But it is still in its 'testing' phase and once we are fully happy with it and there are not issues and problems with it, we will let everyone know the design and diagram. So untill then you will have to wait... |
The_End_Of_Reality (334) | ||
| 458375 | 2006-08-12 07:51:00 | Just like to add the circuit we have developed works great on the test bench but as we have not actually installed it in a computer we are not releasing the circuit until the final testing. Rest assured, the development has increased my skills in circuit design as we had quite a few problems to over-come. We also wanted the circuit to be universal, (hence the external power supply) so it would work in any computer or any other equipment as OPOC has said. I personally, are designing a laptop cooler using this circuit to drive the fan/s after the laptop goes into standby or is switched off. This will be released on the net when finished. Keep yah informed. OPOC, one thing that amazes me, is we often put the fans on top hopefully blowing cool air down. I seem to recall that hot air rises. Would it not be more effective and efficient to put the fans at the bottom (assuming there is an air intake) blowing the cool air up. As this air heats up it will naturally rise to the top, creating a chimney effect. Could you not do this in your setup? Food for thought!! BURNZEE |
Burnzee (6950) | ||
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