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Problem after connecting case fan to 5V from PSU

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#51
i think we were taught BS at college.
Alot of those schools only teach you the tools. It's up you you to figure out how to build anything with them. Consider this, if they teach you too much, you'll become a threat.
 
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#52
In my case I learned this partially in school, the rest of it through Wikipedia and forums like this :)
 

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#53
Alot of those schools only teach you the tools. It's up you you to figure out how to build anything with them. Consider this, if they teach you too much, you'll become a threat.
umm.. its Btech engineering. but it was freshers year, im in mechanical so i guess i wasnt taught everything :p
 
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#54
EDIT: well the computer is artifacting now, I will clean the video card soot, if it still fails I will swear a lot!!!

My HD3450 video card died today. The computer started showing all strange symbols and colors on Bios POST and windows booted with tons of artifacts and BSODs. I think that the resistor blowing near killed it slowly, I ended buying a Powercolor HD5450 for €35 with emergency today and all is fine, for not using my POS onboard one.
 

brandonwh64

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#55
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#56
In my case I used Proteus :)
 
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#57
Multisim is fine for making schematics and doing simple circuit emulation like the images above. If you design anything that oscillates or switches at high frequency, it all goes to hell. "Timestamp too small" ring a bell? haha

When I do design something complicated in Multisim, like the EV controller I was developing, I'll build and test each circuit one by one then paste them all together to form a complete schematic. It'll never run in the emu but it'll run on breadboard.

Do you know of anything more powerfull then Multisim that has a very large component database?
 
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#58
Multisim is fine for making schematics and doing simple circuit emulation like the images above. If you design anything that oscillates or switches at high frequency, it all goes to hell. "Timestamp too small" ring a bell? haha

When I do design something complicated in Multisim, like the EV controller I was developing, I'll build and test each circuit one by one then paste them all together to form a complete schematic. It'll never run in the emu but it'll run on breadboard.

Do you know of anything more powerfull then Multisim that has a very large component database?
Cool I will test it, I used Proteus because we used it in class, before of it we used another basic one that I cannot remember its name (simple components like switches, lightbulbs, batteries, capacitors, resistors, multimeter, etc., none of ICs nor transistor nor anything, lol) then when we began to study logic circuits and some ICs like the famous 555 Timer then changed to Proteus :)
 
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#59
Cool I will test it, I used Proteus because we used it in class, before of it we used another basic one that I cannot remember its name (simple components like switches, lightbulbs, batteries, capacitors, resistors, multimeter, etc., none of ICs nor transistor nor anything, lol) then when we began to study logic circuits and some ICs like the famous 555 Timer then changed to Proteus :)
Was it Electronics Workbench? Looked like an old Win 3.11 app? I still use that for some things. lol



tpu.JPG
 
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brandonwh64

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#60
^^^^

AC to DC converter :)
 
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#61
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#62

de.das.dude

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#63
i use multisim too :p
 
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#64
I found, in my "junk box" a wall wart universal power supply with a selectable voltage output of 3, 4.5, 6, 7.5, 9, and 12V at 900mA and I though to use it as a "fan controller" so now I could adjust the fan speed and making the idea more reliable.

I plug that universal PSU on my strip and I connect the fan to its output, then I will be able to modify the voltage and therefore the speed, I will try to implement it soon :)

The only issue is that the fan cables must go out of the case to connect to that PSU so it could be a bit botched job lol
 
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#65
Why not just make your own fan controller with a pot and transistor?
 
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#66
Can a volume control pot from a radio be used there?
Many thanks :)
 

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#67
10Kohms is ok i guess.
 
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#68
Many thanks, I will extract it and measure it at the min volume position :)
 
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#69
Can a volume control pot from a radio be used there?
Many thanks :)
That depends on the value of the pot and the gain of the transistor you use. Just have to try it. Volume pots are not linear btw.

You can also use a dashboard dimmer from a car if it's the 3-wire type. Those are PWM and good for a few amps. They switch the low side of the fan and can goof up the tach signal. It won't hurt anything but your fan tachs might not read right.
 

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#70
That depends on the value of the pot and the gain of the transistor you use. Just have to try it. Volume pots are not linear btw.

You can also use a dashboard dimmer from a car if it's the 3-wire type. Those are PWM and good for a few amps. They switch the low side of the fan and can goof up the tach signal. It won't hurt anything but your fan tachs might not read right.
Cool I think I can find one of these! I will tell you if how my idea go :)
 
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#71
Cool I think I can find one of these! I will tell you if how my idea go :)
They are "pocket sized" and all over the junkyards. -cough cough- :D Look for older Mazdas and Suzukis. They use simple dimmers. Don't forget to cut the wires with it so you have something to connect to. Let me know what car it came from and I can tell you which wire is which.

Oh! and they even light up! :)
 
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#72
They are "pocket sized" and all over the junkyards. -cough cough- :D Look for older Mazdas and Suzukis. They use simple dimmers. Don't forget to cut the wires with it so you have something to connect to. Let me know what car it came from and I can tell you which wire is which.

Oh! and they even light up! :)
Yeah it would be great :)

I think it's a olde Mazda I will post after I confirm the model :confused:

Many thanks :)


EDIT: BTW I got a "Bad gateway" error after posting the message is the server on maintenance?
 
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#73
I was to lazy to read the hole thread but did changing "USB Wake Up from S3" to off in Bios help?
My USBs, all 5V, are still on when in S3 sleep
 
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#74
I was to lazy to read the hole thread but did changing "USB Wake Up from S3" to off in Bios help?
My USBs, all 5V, are still on when in S3 sleep
Hi, yes I've tried to disable all wake options to no avail (though I wouldn't surprise me could be related because this BIOS is a bit buggy :( )

Many thanks :)
 

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#75
how to connect 5v colling fan

sir,Im an new to serviceing of Cable tv equipments,my question is,when i was repairing a optical transmitter the power supply is working fine and it has 12v,5v and -5v output,but 5v colling fans wire is connected from main motherboard,there is no 5v voltage output from fan connecting socket,and i want to connect 5v colling fans directly from power supply board..plz anyone can guide me..