Netgear GS724T Switch Fan Replacement

[Jackpot17]

I have a Netgear GS724T that I just bought off eBay, however its 2 fans are extremely noisy. I have seen a few tutorials for replacing them online but the recommendations for fans are all 2 pin but the fans on my switch are 3 pin (however they never seem to change rpm).

 

So I'm asking if anyone knows of any suitable 40mm fans that are quiet and have 3 pin connectors for my switch.

 

Here is a link to a couple photos of the switch: (I tried to upload them here but its says "You are only allowed to upload 20mb" even though they are less than that)

https://drive.google.com/open?id=0B_iid8uJg1tTbXg3MXJkc202M1k

 

 

[Electronics Wizardy]

3 minutes ago, Jackpot17 said:

I have a Netgear GS724T that I just bought off eBay, however its 2 fans are extremely noisy. I have seen a few tutorials for replacing them online but the recommendations for fans are all 2 pin but the fans on my switch are 3 pin (however they never seem to change rpm).

 

So I'm asking if anyone knows of any suitable 40mm fans that are quiet and have 3 pin connectors for my switch.

 

Here is a link to a couple photos of the switch: (I tried to upload them here but its says "You are only allowed to upload 20mb" even though they are less than that)

https://drive.google.com/open?id=0B_iid8uJg1tTbXg3MXJkc202M1k

 

 

There normal 40mm fans, you can use what ever you want. If you want quite buy the little noctuas here https://www.amazon.com/40x10mm-Bearing-Premium-Cooling-NF-A4x10/dp/B009NQLT0M

[Jackpot17]

2 minutes ago, Electronics Wizardy said:

There normal 40mm fans, you can use what ever you want. If you want quite buy the little noctuas here https://www.amazon.com/40x10mm-Bearing-Premium-Cooling-NF-A4x10/dp/B009NQLT0M

I did run into these but they seem a little overkill considering I don't mind having a little noise. I would also to prefer to spend a little less

[Electronics Wizardy]

1 minute ago, Jackpot17 said:

I did run into these but they seem a little overkill considering I don't mind having a little noise. I would also to prefer to spend a little less

Well just put a 20ohm reistor in the red lead of both fans.

[Jackpot17]

1 minute ago, Electronics Wizardy said:

Well just put a 20ohm reistor in the red lead of both fans.

Do you think the rpm will be high enough to cool it if I do so?

[Electronics Wizardy]

1 minute ago, Jackpot17 said:

Do you think the rpm will be high enough to cool it if I do so?

Yea, its fine. Those switches don't make a lot of heat

[Jackpot17]

1 minute ago, Electronics Wizardy said:

Yea, its fine. Those switches don't make a lot of heat

Okay. Would it be possible to use a 2 pin fans. Looking at what the pins do could I just leave out the tachometric pin?

[Electronics Wizardy]

2 minutes ago, Jackpot17 said:

Okay. Would it be possible to use a 2 pin fans. Looking at what the pins do could I just leave out the tachometric pin?

Yep, you shouldnt need the tachometer pin. Try unplugging it and see if it starts with no fans first, it might check rpm.

[Jackpot17]

20 minutes ago, Electronics Wizardy said:

Yep, you shouldnt need the tachometer pin. Try unplugging it and see if it starts with no fans first, it might check rpm.

The fans do not come on when I disconnect the tachometer pin

[Electronics Wizardy]

2 minutes ago, Jackpot17 said:

The fans do not come on when I disconnect the tachometer pin

But the switch works? Just put a reisotor on the leads

[Jackpot17]

19 minutes ago, Electronics Wizardy said:

But the switch works? Just put a reisotor on the leads

Could I use one of these? http://www.ebay.co.uk/itm/1-100pcs-3296-Multiturn-Variable-Trimmer-Preset-Resistor-Potentiometer-Pot-/231960342000?var=&hash=item3601e9edf0:m:mJ1Fy4Brfkg9VCEQMF21qWA

[Jackpot17]

On 02/07/2016 at 10:42 PM, Electronics Wizardy said:

Well just put a 20ohm reistor in the red lead of both fans.

Update, I bought  2 22ohm resistors and soldered them in the red wire. The fans are now much quieter and I think the airflow is still more than adequate. Thank you for your solution.