23 July 2020
Some power supply unit for the PCs have very noisy fans. The good one will come with a thermo controlled fan; the cheaper ones usually have this omitted especially when they are made for Bit-Coin mining machines. The solution is either to change the fan or have a fan speed controllers installed. This video describe how best to carry these works.
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Update:
The circuit in the video used IRF 634 which has a rated voltage of about 500V. A cheaper euivalent is IRF 744 rated at 250 V. The components are listed as shown
The veroboard layout of the component and its connection is as shown below
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