Nexo - in Latin connection - BT - Bluetooth. is a bluetooth receiver born from the need to connect a bluetooth audio receiver to a professional audio system with XLR outputs; something that is not very common on the market and so I decided to create it myself.
The project is governed by an ESP32 module (ESP32-WROOM-32UE-N8) which, as A2DP Sink, receives music from a device via Bluetooth and sends it via the I2S protocol to an DAC PCM5102APWR which returns two stereo audio signals.
To obtain the balanced audio signal, a differential driver such as DRV135UA/2K5, After that the signal is sent to the XLR connector (in this case hybrid because a 6mm TRS connector can also be used)
- ESP32-WROOM-32UE-N8
- DAC PCM5102APW
- Differntial driver DRV135UA/2K5
- predisposition for an i2c OLED display
- 2 LEDs to report the state of nutrition (dual in order to isolate the analogous part from the digital part)
- 1 RGB LED
- Barrel-Jack connector and a switch to choose whether to use the USB-C or the Jack as a power supply.
- A negative voltage generator (ICL7660m/TR) for differential drivers
- A connector to use the remaining pins of the ESP 32 module in the future
- EXTERNAL 2.4GHZ ANTENNA
- protection from static electric discharges on XLR outputs
The software is available on Github in code file I edit one of lybriry that i use. Also I set the partition scheme to HUGE APP.
#Render - and photos:
- 3D render from the top
- 3D render from the bottom
- schematich (Digital parts)
- schematich (Analogic parts)
