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Announcing the Raspberry Pi PoE+ HAT
The Raspberry Pi Foundation has just announced the Raspberry Pi PoE+ HAT compliant with 802.3at (aka PoE+) and 802.3af standards and support for up to 25.5 Watts input.
It will replace the Raspberry Pi PoE HAT introduced in 2018 which was limited to 802.3af standard with a maximum of 15.4 Watts input and will become available around mid-June for $20 plus taxes and shipping.
HAT = Hardware Attached on Top.
Here is a competing Waveshare PoE HAT for Raspberry Pi 3B+/4B.
Also at CNX Software.
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Raspberry Pi Foundation Announces a New Power Over Ethernet HAT
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(Score: 1, Interesting) by Anonymous Coward on Tuesday May 25 2021, @03:47AM (2 children)
If you look at the larger version of the picture, you will see it has a series of holes drilled in it. That is so you can use headers with longer pins to place in the Pi's header. The remaining pins are split and both the PoE HAT and the other hat you are using. It is almost 100% compatible with the boards but you do have to keep in mind the absolute potential difference that may occur because the PoE device's naturally isolated state.
(Score: 2) by JoeMerchant on Wednesday May 26 2021, @02:25AM (1 child)
As long as the DAC drivers still work this should be fine - the speaker the amp is driving also floats... Now: how much audio-band noise do the PoE circuits make?
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(Score: 0) by Anonymous Coward on Wednesday May 26 2021, @07:25AM
I can't answer that. There is quite a bit that goes into a calculation like that, but they haven't released the necessary information to figure that out that I could find. Some PoE circuits will have mains hum if the cable isn't shielded, they are improperly grounded, or built too cheaply, but these shouldn't have that problem in a way that isn't easily rectified. This means your main concern will be the switch noise and harmonics, which I cannot characterize. Some make no noise in those bands, others are partially filtered, some just don't care.