![]() By contrast, the NA-FH1's signal quality improvement circuitries guarantee reliable readout and speed control, even if incoming signals may be of less-than-ideal quality. In particular, PWM based speed control may not work reliably if multiple fans are connected and RPM speed signals may be transmitted in poor quality, especially at low fan speeds, which can cause readout errors. While this helps to reduce cost, there are significant drawbacks with regards to function and safety. Many fan hubs that are available on the market use very basic PCB designs without any protection or circuitry for signal quality improvement.
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