very low buzz noise
#1
The Rockpro64 boards emit a buzz noise (audible only at some centimeters), this is probably due to the converters. However. there is no noise at all on the rock64. Then, I am wondering if it is not due to 12V instead of the 5V for rock64. Is there a reason for this choice ? reduce current ?

Powering with GPIO 5V does not reduce the noise
#2
(12-12-2020, 04:21 AM)LMM Wrote: The Rockpro64 boards emit a buzz noise (audible only at some centimeters), this is probably due to the converters. However. there is no noise at all on the rock64. Then, I am wondering if it is not due to 12V instead of the 5V for rock64. Is there a reason for this choice ? reduce current ?

Powering with GPIO 5V does not reduce the noise

The buzz noise may comes from inductor vibration. You can put some glue or wax on the inductors and the noise may goes away.
#3
(12-15-2020, 12:23 AM)tllim Wrote:
(12-12-2020, 04:21 AM)LMM Wrote: The Rockpro64 boards emit a buzz noise (audible only at some centimeters), this is probably due to the converters. However. there is no noise at all on the rock64. Then, I am wondering if it is not due to 12V instead of the 5V for rock64. Is there a reason for this choice ? reduce current ?

Powering with GPIO 5V does not reduce the noise

The buzz noise may comes from inductor vibration. You can put some glue or wax on the inductors and the noise may goes away.
Thanks for your answer tllim. Just another question, where are the inductors located  Confused ?
#4
(12-15-2020, 05:04 PM)LMM Wrote:
(12-15-2020, 12:23 AM)tllim Wrote:
(12-12-2020, 04:21 AM)LMM Wrote: The Rockpro64 boards emit a buzz noise (audible only at some centimeters), this is probably due to the converters. However. there is no noise at all on the rock64. Then, I am wondering if it is not due to 12V instead of the 5V for rock64. Is there a reason for this choice ? reduce current ?

Powering with GPIO 5V does not reduce the noise

The buzz noise may comes from inductor vibration. You can put some glue or wax on the inductors and the noise may goes away.
Thanks for your answer tllim. Just another question, where are the inductors located  Confused ?

There are few on the board, ferrite material and top is round. Normally next to power regulator chip.
#5
(12-15-2020, 09:51 PM)tllim Wrote:
(12-15-2020, 05:04 PM)LMM Wrote:
(12-15-2020, 12:23 AM)tllim Wrote:
(12-12-2020, 04:21 AM)LMM Wrote: The Rockpro64 boards emit a buzz noise (audible only at some centimeters), this is probably due to the converters. However. there is no noise at all on the rock64. Then, I am wondering if it is not due to 12V instead of the 5V for rock64. Is there a reason for this choice ? reduce current ?

Powering with GPIO 5V does not reduce the noise

The buzz noise may comes from inductor vibration. You can put some glue or wax on the inductors and the noise may goes away.
Thanks for your answer tllim. Just another question, where are the inductors located  Confused ?

There are few on the board, ferrite material and top is round. Normally next to power regulator chip.
Just tried with wax ... the noise is reduced. thanks. LMM


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