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Recommend me a pair of 120mm PWM case fans. - Page 9

post #81 of 103
well tbh there isnt really a DC signal

signal is just signal, a low level current that conveys information. signal can be anything really and doesnt carry power

DC is a current that is meant to carry power and that is pretty much your 12v and ground


why are we arguing about technicalities,
post #82 of 103
Quote:
Originally Posted by akromatic View Post

well tbh there isnt really a DC signal

signal is just signal, a low level current that conveys information. signal can be anything really and doesnt carry power

DC is a current that is meant to carry power and that is pretty much your 12v and ground


why are we arguing about technicalities,
Exactly. thumb.gif
post #83 of 103
Quote:
Originally Posted by doyll View Post

This has nothing to do with "motor" and engine"
You keep throwing "Tach signal", "control loop", "library reference", and now "tach signal is driven by DC voltage"...
The library reference you quote: "tach signal is driven by DC voltage" is not a "DC signal"... any more than it is a "tach voltage"

DC = direct current = a continuous electric current flowing in one direction.
Signal = a function that conveys information
We can have DC powered signals... but that is not a DC signal.

There is no "DC signal" going to the Phanteks hub from your MoBo fan header.. It is DC voltage. There is a tach signal coming from fan motor to your MoBo fan header.. it is not a DC signal.

Tach signal is tach receiving a signal

DC signal is not direct current receiving a signal.

Direct current / signal has no similarity to "engine / motor" or "potato / potahto, tomato / tomahto, pyjamas / pyjahmas".

As I see it you made a simple mistake when you wrote:
"I am running 10 DC fans off the Phanteks Fan Hub with one DC signal from the MoBo."
I think you were saying that you are powering 10 fans with DC voltage on the Phanteks fan hub supplied from your motherboard fan hub.

That is what I have been trying to find out.. and if you are able to adjust the fan speed using variable voltage control from MoBo header. thumb.gif

Quote:
sig·nal (sgnl)

3. Electronics An impulse or a fluctuating electric quantity, such as voltage, current, or electric field strength, whose variations represent coded information.

1. anything that serves to indicate, warn, direct, command, or the like, as a light, a gesture, an act, etc.: a traffic signal; a signal to leave.

Edited by JackNaylorPE - 1/13/14 at 3:00pm
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post #84 of 103
Quote:
Originally Posted by JackNaylorPE View Post

Quote:
sig·nal (sgnl)

3. Electronics An impulse or a fluctuating electric quantity, such as voltage, current, or electric field strength, whose variations represent coded information.

1. anything that serves to indicate, warn, direct, command, or the like, as a light, a gesture, an act, etc.: a traffic signal; a signal to leave.
Indeed! thumb.gif

Key word from your above statement are whose variations represent coded information

You have that signal (coded informaton) coming from fan on fan header 1 on Phanteks fan hub to mobo header on pin 3.. the RPM signal.

But there is no "DC signal" (coded information) going from your mobo's non-PWM fan header to your Phanteks PWM fan hub, than on to your 10 fans like you originally said. Unless it is true PWM header.. and you have lead me to believe it is not. tongue.gif
Quote:
Your exact words
"I am running 10 DC fans off the Phanteks Fan Hub with one DC signal from the MoBo."

There is variable voltage DC current from mobo fan header pin 2 to the hub and on to all 10 fans.. including the one that is sending the RPM signal back to mobo.
Edited by doyll - 1/13/14 at 3:57pm
post #85 of 103
Read the 2nd definition.

What is "commanding" or "directing" the fan to go faster / slower .... your answer is "the varying voltage from the MoBo"

So does the "varying voltage" fit the definition of "serving to command or direct" the fan to go faster ?

Better yet.... I am in FanXpert 2 ....

I select a fan control setting of "1050 rpm" .... the system responds with 3 seconds and is doing 1051 rpm ....
I select a fan control setting of "850 rpm" .... the system responds with 3 seconds and is doing 852 rpm ....
I select a fan control setting of "550 rpm" .... the system responds with 3 seconds and is doing 548 rpm ....
I select a fan control setting of "450 rpm" .... the system responds with 3 seconds and is doing 452 rpms ....

Now if there is nothing "commanding or directing" the fan to change its speed to the exact setting I set in the computer than what magic is taking place ? I input it using my keyboard .... the KB is plugged into the MoBo ..... who / what told, directed, commanded ..... or "signaled" the fan to go 1050 / 850 / 550 / 450.
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post #86 of 103
Quote:
Originally Posted by JackNaylorPE View Post

Read the 2nd definition.

What is "commanding" or "directing" the fan to go faster / slower .... your answer is "the varying voltage from the MoBo"

So does the "varying voltage" fit the definition of "serving to command or direct" the fan to go faster ?

Better yet.... I am in FanXpert 2 ....

I select a fan control setting of "1050 rpm" .... the system responds with 3 seconds and is doing 1051 rpm ....
I select a fan control setting of "850 rpm" .... the system responds with 3 seconds and is doing 852 rpm ....
I select a fan control setting of "550 rpm" .... the system responds with 3 seconds and is doing 548 rpm ....
I select a fan control setting of "450 rpm" .... the system responds with 3 seconds and is doing 452 rpms ....

Now if there is nothing "commanding or directing" the fan to change its speed to the exact setting I set in the computer than what magic is taking place ? I input it using my keyboard .... the KB is plugged into the MoBo ..... who / what told, directed, commanded ..... or "signaled" the fan to go 1050 / 850 / 550 / 450.

FanXpert 1 is doing the "commanding" or "directing" of the motherboard to increase or decrease voltage.

"Variable voltage" is only voltage, and is not "serving to command or direct" the fan. Increase voltage and fan speed up, decrease voltage and fan slows down.
Keyboard / mouse send "signals" to motherboard / FanXpert2. FanXpert2 commands motherboard to send X% of 12Volt power gtom fan header and to fan. Fan returns RPM signal to motherboard / FanXpert2 and you see an RPM reading on monitor.

Fan has no ability to to respond to commands of any sort. Motor receives power (voltage) and runs at whatever speed that voltage spins it at. (If fan is PWM than PWM signal commands 12v power pulses to motor).


Changing subject; Does FanXpert2 actually using fan speed / RPM setting to control fan speed or is it using fan power percentage setting and RPM is just a reading of the power percentage? Most of the software I've check out is power percentage controlled and the RPM is a reading of what the fan is running at that power percentage setting. IE if I plug in a resistor/diode like many fans and/or coolers come with the same power percentage setting give a lower RPM reading.
Edited by doyll - 1/13/14 at 7:14pm
post #87 of 103
Thread Starter 
Gentlemen may I introduce to you my 2 friends (Click to show)
"Let it go" and "Hijacked"

I understand it is purely academic and info is for all to see and learn, but... Well I've already posted about this yesterday.
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post #88 of 103
Such is the nature of OCN ... Can't give a answer? Change the topic ...

Anyway, you got my PM neo, please tell us what do you think of them wink.gif
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post #89 of 103
topics been derailed

anyway neo, do have a look at those arctic fans, you might like them.

they support PWM sharing too so you can share a header to control multiple fans which saves you trouble from buying PWM y cables/ splitters.


i believe the CO (continuous operation) version uses a different bearing type so IMO get the F12 non CO for the fluid bearing but ether way they have 6years warranty and available at a good price
post #90 of 103
Thread Starter 
Quote:
Originally Posted by akromatic View Post

topics been derailed

anyway neo, do have a look at those arctic fans, you might like them.

they support PWM sharing too so you can share a header to control multiple fans which saves you trouble from buying PWM y cables/ splitters.


i believe the CO (continuous operation) version uses a different bearing type so IMO get the F12 non CO for the fluid bearing but ether way they have 6years warranty and available at a good price

I have my man. Their price certainly looks attractive, and they look (aesthetically) decent as well. The only downfall is that there are reported typical PWM clicking, which is strange as it prides itself on the function. BUT the shared PWM remains a VERY attractive function.

DaveLT there has PMed me about Cooler Master's JetFlo 120 and aside from the slightly high price, they look VERY good. No PWM-clicking, airflow optimized blades (I mean look at them.) , led OR no LED version, PWM 4 pin, AND they also look VERY good.

Safe to say no more Corsair for consideration when I have the above two. So thanks guys! thumb.gif Made some progress! Just as I was about to give up and live with my current fans... thumb.gif
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