Orico BTA-508 Bluetooth USB adapter

Claiming to use RTL8761BUV chip and this statement seems to be correct (USB\VID_0BDA&PID_8771&REV_0200).

Some linux dumps: https://songdongsheng.github.io/2020/11/15/realtek-rtl8761b-based-bluetooth-adapter/

While adapter was detected by Windows 7 immediately, I wasn't able to find any Bluetooth device until driver package was installed.

Cheaply looking plug using PCB pads as contacts, but I guess this is expected.

Big issue for me: when working with Linux it requires relatively new kernel version, 5.8.

Zolan ZS12 power supply

 Small stabilized power supply typically used with TV antenna amplifiers.

12V / 100mA

Bare minimum circuit and skimping on insulation on primary side and transformer itself

78L12 as voltage regulator