3 ms·
I've tested this device and that works. Nice clean power on the microphones whilst running over POE. https://thepihut.com/products/power-filter-board-for-raspb
by hcfman 2y ago
I've tested this device and that works. Nice clean power on the microphones whilst running over POE.
https://thepihut.com/products/power-filter-board-for-raspberry-pi https://thepihut.com/products/power-filter-board-for-raspber...
The chip you point to suggests a much simpler approach. Is it really that simple? There are a great many more bits on the board I point to. Why would they take a hard way if one simple chip can do it ?
- 15155 2y agoThe board you linked isn't a galvanic isolator, it's just a capacitor bank covering a bunch of different frequency ranges. The ADUM isolator I linked as well as flyback converters use transformers to provide a high-voltage isolation barrier between the source and device being supplied. Transformers are generally larger, more expensive, and less efficient than non-isolated DC circuits. The POE supply itself is isolated (with a transformer) and doesn't need to be noisy necessarily - but if you want even more quiet, another level of isolation can't hurt.
- hcfman 2y agoInteresting. Do you know of any built products that use the approach you are suggesting ?