Hi olegMy friend
Maybe
But I not find the connection of 47uf tantalum cap near bias transistor on yours photo
Maybe this one is old photo ?
The temperature compensation transistor next to 47uf is designed below the PCB due to its need to detect the temperature of the heat sink (chassis bottom plate). Currently, most new NAPs adopt this design.
Attachments
My friend, you have observed very carefully. The PCB in the picture is the first version (number 20230425), and I only used it for photography. I also made a finished product, but I have never sold this version. I started selling it from the second version (number 20230510), and I guarantee that the second version is very good without any problems.
Attachments
Good dayMy friend, you have observed very carefully. The PCB in the picture is the first version (number 20230425), and I only used it for photography. I also made a finished product, but I have never sold this version. I started selling it from the second version (number 20230510), and I guarantee that the second version is very good without any problems.
Mr Caowei
This design is better than 05.2023?
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End of design the NAP155XSAnywhere I draw of this model naps too ) for myself from original board
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Maybe this one but I not sure for quality
https://sl.aliexpress.ru/p?key=a27vUBR
Supplier write about original good parts
https://sl.aliexpress.ru/p?key=a27vUBR
Supplier write about original good parts
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