Re: Computer fan noise and maintenance
That's not because of ptfe, the grease has tackifier agent added that increases stringiness. I used that kind of viscous lube to grease 12cm sleeve bearing fan.
Silicone oil is a poor lubricant, I have it here and it can't form a film that's thick enough, like mineral or synthetic oil. I wouldn't use it for fans. Actually if you try to use only silicone oil to lubricate bearings, you would still hear silent rattling sound sometimes - meaning poor lubrication.
I'd also stay away from mixing oil with grease to avoid i...
espresso
Member
Last Activity: 04-14-2020, 12:22 PM
Joined: 08-31-2008
Location: Beograd
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Re: Computer fan noise and maintenance
The power of the potentiometer is at its highest when pot's resistance is the same as load. It's my observation, try to verify this.Leave a comment:
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Re: Computer fan noise and maintenance
That pot would have to be powerfull. I use 1W resistors in series with fans to reduce rpm/noise. For 12V/150mA fans the appropriate values would be between 47-100 Ω in my experience. For 400mA you would have to go with even lower values (probably 22-47 Ω).
You should try 100Ω pot (rated at 1.5W at least).Leave a comment:
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Re: Computer fan noise and maintenance
That Mobil 1 could be similar to my "High temperature grease" on the picture. Both are lithium complex grease types. Except that Mobil 1 has a higher viscosity which you compensate by mixing with oil.
I actually do this by disassembling the fans and then cleaning the bearings and the shaft with a degreaser spray. Only then I apply grease along the entire length of the sleeve. I usually use a toothpick for this.
For worn out bearings I use higher viscosity grease (800cSt). I still haven't been able to see the final...Leave a comment:
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Re: Computer fan noise and maintenance
I've been doing some research on lubrication and came to the same conclusions as 999999999 posted a while ago. I used all kinds of greases on pc fans just for fun. The longevity seems to be better than with stock lubricant.
I'm just not sure how long can a fan run on a thin film of grease that doesn't get replenished.
There is also some difference in rpm when using grease instead of oil. It can be as high as 20-30% when the fan starts. But after 15 minutes or so, the speed settles closer to the oil's maximum speed....Leave a comment:
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Re: My HV input filter cap collection (good and bad?)
I have a bunch of these and find them to be decent despite of some people complaining they found them leaking or dead (so are Rubycons if not used properly). The thing is that Fujicon doesn't falsely advertise their capacitors like Samxon does. On paper Samxon is impressive but they proved to be utter crap.
Fujicon, on the other hand, admits that it doesn't take much ripple in standard low esr variant and should be used accordingly. There are, however, long life and high ripple series that are appropriate for mobos, PSUs...Leave a comment:
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Re: Which TVS diode for 230V AC mains?
And as for spark gap that you mention, I can obtain only one of the gas discharge tubes from this link
[url]http://www.wuhuan.com.tw/zdr/zd3r.htm[/url]
I can get [B]ZD3R 230 AW-D[/B]. Can it be used for this purpose?Re: Which TVS diode for 230V AC main... this purpose?Re: Which TVS diodeLeave a comment:
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Re: Which TVS diode for 230V AC mains?
I already bought a few with 332 - 368 V breakdown voltage. I used it in conjunction with a varistor (250VAC, 1W).Leave a comment:
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Which TVS diode for 230V AC mains?
Hello. I intend to get some TVS diodes for protecting electronic devices in my home. I don't know which one of the following two types would serve the purpose correctly. I need them for 230 V AC.
[B]1.5KE300CA[/B]
Stand-off voltage: 256 V
Breakdown voltage: 285 - 315 V
Clamping voltage: 414 V
or
[B]1.5KE350CA[/B]
Stand-off voltage: 299 V
Breakdown voltage: 332 - 368 V
Clamping voltage: 482 VHello. I intend to get some TVS diodes for protecting electronic devices in my home. I don't know which one of the following -
Panasonic AK audio series?
Hello. I bought a few of these miniature electrolytics to replace the ones on my sound card. Just for fun. I saw that they were advertised for audio applications.
But the thing is that I cannot find anything about them on the internet; they aren't even mentioned in the list of Panasonic's series chart.
Has anyone ever used them and what exactly makes them preferable for audio?
I found them [URL=http://uk.farnell.com/panasonic/eca1eak220x/capacitor-22uf-25v/dp/8766762]here[/URL]. They have Matsushita M logo.Hello. I bought a few of these miniature electrolytics to replace -
Re: ECS P4M800Pro-M Ver 1.0A high pitched whine
Chokes are the most probable source of the noise. It might help if you poured some lacquer on the chokes. By pressing each coil with a wooden stick one can pinpoint the exact choke that's producing the noise.Leave a comment:
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6.3V caps on 5V rail - not recommended?
Would it be safe to put 6.3V capacitors on 5V rails in PC power supplies?
I read somewhere that in PC supplies one should use 10V caps on 5V rails.
And for example, National Semiconductor's datasheet for switching regulators states:
Are there any voltage spikes that can harm the capacitors in the long run?
I bought some FM Panasonics to replace the existing caps but they are 6.3V rated unlike the original ones which are 10V.
Also, Panasonics have much lower esr than the caps I used before so I hope replacing won't cause instability.... -
Re: Bad Capacitors Heat Up?
Maybe if you get the schematic diagram, you can trace the problem. What's the exact model number of that phone? Measure the output voltage of the adaptor to see if it's working correctly or try another one if you don't have a voltmeter.Leave a comment:
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Re: A few questions about recapping this particular PSU
It does have the capacitance meter (0-99999uF) with 1% accuracy. Here is the picture of the 50€ device when dissasembled:
I can inbox you the guy's email so you can try contact him. The country is Serbia.
ESR measuring capabilities are
[CODE]0,001 — 0,999 ohm with 0,001 ohm resolution
0,010 - 9,99 ohm with 0,01 ohm resolution
0,1 - 99,9 ohm with 0,1 ohm resolution[/CODE]...Code:Re: A few questions about recapping this particular PSU It
Leave a comment:
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Re: Bad Capacitors Heat Up?
It heats up because the ESR has gone high or maybe because the capacitance is too small (hence high ripple causes heating). Where is this capacitor?Leave a comment:
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Re: A few questions about recapping this particular PSU
This pic is from a russian site where they talk about constructing ESR meter:
[url]http://pro-radio.ru/measure/3288/[/url]
However, a guy in my country made a similar model and now he is selling it for 50€.
Here is something that looks like a simpler solution that one could make at home
I can get all the parts and I would make this one if there wasn't for double layer PCB.Re: A few questions about recapping ...ite where theyLeave a comment:
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Re: A few questions about recapping this particular PSU
Unfortunatelly 2200uf/16v is too big to fit inside (13x25mm). I could probably mount it but it wouldn't be close to pcb.Leave a comment:
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Re: A few questions about recapping this particular PSU
I finished the job last night and here is the summary.
I used Fujicon RK and TM serties as replacements.
All the electrolytics have been replaced with the appropriate values except for these:
[CODE]C18: [B]2200µf/6.3V 105C Low ESR[/B] instead of [B]1000µf/16V 105C Low ESR ("Saturn logo")[/B]
C32: [B]1000µf/16V 105C Low ESR[/B] instead of [B]470µf/16V 105C Low ESR ("Saturn logo")[/B]
C23: [B]2200µf/6.3V 105C Low ESR[/B] instead of [B]1000µf/10V 105C Low ESR (G-Luxon)[/B]...Last edited by espresso; 10-12-2008, 04:32 AM.Leave a comment:
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Re: A few questions about recapping this particular PSU
Please do not comment the quality of this PSU as I am completely aware what I'm dealing with. That's why I am emphasising the last sentance that I wrote in my first post:
I'm asking for an advice on recapping. So basically, I would like to know if I am safe with larger capacity on the output rails? I already have the capacitors, the question is whether I should mount them....Last edited by espresso; 10-09-2008, 09:59 AM.Leave a comment:
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Re: A few questions about recapping this particular PSU
Thank you for the reply.
My idea was to make the supply more stable by increasing the capacitance and to put less stress the motherboard caps.
I will manage to fit most of the capacitors. I already have the replacements in my stock.
As I understand there shouldn't be problems with increasing the caps which are acting as filters. The only thing that I would benefit is decreasing the ripple, right?Leave a comment:
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