3. Board Design

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HILO edited this page Apr 6, 2026 · 2 revisions

Board Design

Main Board Design Concept

193mm x 130mm dimensions. All-in-one board solution for a Powered Speaker System.
The main board has the following features

Features:

Double Differential ADC Input Circuit
Balanced-XLR Input or Differential RCA-pin Analog Input
Optical or Coaxial S/PDIF Input
Amanero Combo384/YORK pico or XIAO RP2040 USB-Audio Input
Raspberry-pi ZERO 2W Slot with control buttons
TL-232R-3V3 USB-UART Cable Connection Pin-Header
AUX-ADC pin-header
Onboard two Trimmer-POTs
Optional Toggle Switch for DSP control
External Front Panel Control PCB connectivity
DC24V Single Power

Optional Board

Add a capability to access from the Front Panel

Front Panel Control Board

For standalone use, a front panel board can be used.

Connected via 8-pin cable
4 LED Source indicator shows the selected input source
Selective Parts mount (Mainboard or Front Panel Board)
Through-hole Lead parts for easy hand-mount building

Schematic Circuit Diagram of the Front Panel Control Board

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