Добавил плату аттенюатора

.gitignore

@@ -1,3 +1,4 @@
 amplifier-control-panel/amplifier-control-panel-backups/*
 power-unit-5v/power-unit-5v-backups/*
-/optopair-module/optopair-module-backups/*
+/optopair-module/optopair-module-backups/*
+attenuator/attenuator-backups/*

attenuator/attenuator.kicad_prl

@@ -0,0 +1,131 @@
+{
+  "board": {
+    "active_layer": 2,
+    "active_layer_preset": "",
+    "auto_track_width": true,
+    "hidden_netclasses": [],
+    "hidden_nets": [],
+    "high_contrast_mode": 0,
+    "net_color_mode": 1,
+    "opacity": {
+      "images": 0.6,
+      "pads": 1.0,
+      "shapes": 1.0,
+      "tracks": 1.0,
+      "vias": 1.0,
+      "zones": 0.6
+    },
+    "selection_filter": {
+      "dimensions": true,
+      "footprints": true,
+      "graphics": true,
+      "keepouts": true,
+      "lockedItems": false,
+      "otherItems": true,
+      "pads": true,
+      "text": true,
+      "tracks": true,
+      "vias": true,
+      "zones": true
+    },
+    "visible_items": [
+      "vias",
+      "footprint_text",
+      "footprint_anchors",
+      "ratsnest",
+      "grid",
+      "footprints_front",
+      "footprints_back",
+      "footprint_values",
+      "footprint_references",
+      "tracks",
+      "drc_errors",
+      "drawing_sheet",
+      "bitmaps",
+      "pads",
+      "zones",
+      "drc_warnings",
+      "drc_exclusions",
+      "locked_item_shadows",
+      "conflict_shadows",
+      "shapes"
+    ],
+    "visible_layers": "ffffffff_ffffffff_ffffffff_ffffffff",
+    "zone_display_mode": 0
+  },
+  "git": {
+    "repo_type": "",
+    "repo_username": "",
+    "ssh_key": ""
+  },
+  "meta": {
+    "filename": "attenuator.kicad_prl",
+    "version": 5
+  },
+  "net_inspector_panel": {
+    "col_hidden": [
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false
+    ],
+    "col_order": [
+      0,
+      1,
+      2,
+      3,
+      4,
+      5,
+      6,
+      7,
+      8,
+      9
+    ],
+    "col_widths": [
+      0,
+      0,
+      0,
+      0,
+      0,
+      0,
+      0,
+      0,
+      0,
+      0
+    ],
+    "custom_group_rules": [],
+    "expanded_rows": [],
+    "filter_by_net_name": true,
+    "filter_by_netclass": true,
+    "filter_text": "",
+    "group_by_constraint": false,
+    "group_by_netclass": false,
+    "show_unconnected_nets": false,
+    "show_zero_pad_nets": false,
+    "sort_ascending": true,
+    "sorting_column": 0
+  },
+  "open_jobsets": [],
+  "project": {
+    "files": []
+  },
+  "schematic": {
+    "selection_filter": {
+      "graphics": true,
+      "images": true,
+      "labels": true,
+      "lockedItems": false,
+      "otherItems": true,
+      "pins": true,
+      "symbols": true,
+      "text": true,
+      "wires": true
+    }
+  }
+}

attenuator/attenuator.kicad_pro

@@ -0,0 +1,641 @@
+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "apply_defaults_to_fp_fields": false,
+        "apply_defaults_to_fp_shapes": false,
+        "apply_defaults_to_fp_text": false,
+        "board_outline_line_width": 0.05,
+        "copper_line_width": 0.2,
+        "copper_text_italic": false,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "copper_text_upright": false,
+        "courtyard_line_width": 0.05,
+        "dimension_precision": 4,
+        "dimension_units": 3,
+        "dimensions": {
+          "arrow_length": 1270000,
+          "extension_offset": 500000,
+          "keep_text_aligned": true,
+          "suppress_zeroes": true,
+          "text_position": 0,
+          "units_format": 0
+        },
+        "fab_line_width": 0.1,
+        "fab_text_italic": false,
+        "fab_text_size_h": 1.0,
+        "fab_text_size_v": 1.0,
+        "fab_text_thickness": 0.15,
+        "fab_text_upright": false,
+        "other_line_width": 0.1,
+        "other_text_italic": false,
+        "other_text_size_h": 1.0,
+        "other_text_size_v": 1.0,
+        "other_text_thickness": 0.15,
+        "other_text_upright": false,
+        "pads": {
+          "drill": 0.8,
+          "height": 1.27,
+          "width": 2.54
+        },
+        "silk_line_width": 0.1,
+        "silk_text_italic": false,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.1,
+        "silk_text_upright": false,
+        "zones": {
+          "min_clearance": 0.5
+        }
+      },
+      "diff_pair_dimensions": [
+        {
+          "gap": 0.0,
+          "via_gap": 0.0,
+          "width": 0.0
+        }
+      ],
+      "drc_exclusions": [],
+      "meta": {
+        "version": 2
+      },
+      "rule_severities": {
+        "annular_width": "error",
+        "clearance": "error",
+        "connection_width": "warning",
+        "copper_edge_clearance": "error",
+        "copper_sliver": "warning",
+        "courtyards_overlap": "error",
+        "creepage": "error",
+        "diff_pair_gap_out_of_range": "error",
+        "diff_pair_uncoupled_length_too_long": "error",
+        "drill_out_of_range": "error",
+        "duplicate_footprints": "warning",
+        "extra_footprint": "warning",
+        "footprint": "error",
+        "footprint_filters_mismatch": "ignore",
+        "footprint_symbol_mismatch": "warning",
+        "footprint_type_mismatch": "ignore",
+        "hole_clearance": "error",
+        "hole_to_hole": "warning",
+        "holes_co_located": "warning",
+        "invalid_outline": "error",
+        "isolated_copper": "warning",
+        "item_on_disabled_layer": "error",
+        "items_not_allowed": "error",
+        "length_out_of_range": "error",
+        "lib_footprint_issues": "warning",
+        "lib_footprint_mismatch": "warning",
+        "malformed_courtyard": "error",
+        "microvia_drill_out_of_range": "error",
+        "mirrored_text_on_front_layer": "warning",
+        "missing_courtyard": "ignore",
+        "missing_footprint": "warning",
+        "net_conflict": "warning",
+        "nonmirrored_text_on_back_layer": "warning",
+        "npth_inside_courtyard": "ignore",
+        "padstack": "warning",
+        "pth_inside_courtyard": "ignore",
+        "shorting_items": "error",
+        "silk_edge_clearance": "warning",
+        "silk_over_copper": "warning",
+        "silk_overlap": "warning",
+        "skew_out_of_range": "error",
+        "solder_mask_bridge": "error",
+        "starved_thermal": "error",
+        "text_height": "warning",
+        "text_on_edge_cuts": "error",
+        "text_thickness": "warning",
+        "through_hole_pad_without_hole": "error",
+        "too_many_vias": "error",
+        "track_angle": "error",
+        "track_dangling": "warning",
+        "track_segment_length": "error",
+        "track_width": "error",
+        "tracks_crossing": "error",
+        "unconnected_items": "error",
+        "unresolved_variable": "error",
+        "via_dangling": "warning",
+        "zones_intersect": "error"
+      },
+      "rules": {
+        "max_error": 0.005,
+        "min_clearance": 0.0,
+        "min_connection": 0.0,
+        "min_copper_edge_clearance": 0.5,
+        "min_groove_width": 0.0,
+        "min_hole_clearance": 0.25,
+        "min_hole_to_hole": 0.25,
+        "min_microvia_diameter": 0.2,
+        "min_microvia_drill": 0.1,
+        "min_resolved_spokes": 2,
+        "min_silk_clearance": 0.0,
+        "min_text_height": 0.8,
+        "min_text_thickness": 0.08,
+        "min_through_hole_diameter": 0.3,
+        "min_track_width": 0.0,
+        "min_via_annular_width": 0.1,
+        "min_via_diameter": 0.5,
+        "solder_mask_to_copper_clearance": 0.0,
+        "use_height_for_length_calcs": true
+      },
+      "teardrop_options": [
+        {
+          "td_onpthpad": true,
+          "td_onroundshapesonly": false,
+          "td_onsmdpad": true,
+          "td_ontrackend": false,
+          "td_onvia": true
+        }
+      ],
+      "teardrop_parameters": [
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_round_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_rect_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_track_end",
+          "td_width_to_size_filter_ratio": 0.9
+        }
+      ],
+      "track_widths": [
+        0.0,
+        0.5,
+        1.0
+      ],
+      "tuning_pattern_settings": {
+        "diff_pair_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 1.0
+        },
+        "diff_pair_skew_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        },
+        "single_track_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        }
+      },
+      "via_dimensions": [
+        {
+          "diameter": 0.0,
+          "drill": 0.0
+        }
+      ],
+      "zones_allow_external_fillets": false
+    },
+    "ipc2581": {
+      "dist": "",
+      "distpn": "",
+      "internal_id": "",
+      "mfg": "",
+      "mpn": ""
+    },
+    "layer_pairs": [],
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "erc": {
+    "erc_exclusions": [],
+    "meta": {
+      "version": 0
+    },
+    "pin_map": [
+      [
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        2
+      ],
+      [
+        0,
+        2,
+        0,
+        1,
+        0,
+        0,
+        1,
+        0,
+        2,
+        2,
+        2,
+        2
+      ],
+      [
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        0,
+        1,
+        0,
+        1,
+        2
+      ],
+      [
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        1,
+        1,
+        2,
+        1,
+        1,
+        2
+      ],
+      [
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        2
+      ],
+      [
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        2
+      ],
+      [
+        1,
+        1,
+        1,
+        1,
+        1,
+        0,
+        1,
+        1,
+        1,
+        1,
+        1,
+        2
+      ],
+      [
+        0,
+        0,
+        0,
+        1,
+        0,
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        2
+      ],
+      [
+        0,
+        2,
+        1,
+        2,
+        0,
+        0,
+        1,
+        0,
+        2,
+        2,
+        2,
+        2
+      ],
+      [
+        0,
+        2,
+        0,
+        1,
+        0,
+        0,
+        1,
+        0,
+        2,
+        0,
+        0,
+        2
+      ],
+      [
+        0,
+        2,
+        1,
+        1,
+        0,
+        0,
+        1,
+        0,
+        2,
+        0,
+        0,
+        2
+      ],
+      [
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2
+      ]
+    ],
+    "rule_severities": {
+      "bus_definition_conflict": "error",
+      "bus_entry_needed": "error",
+      "bus_to_bus_conflict": "error",
+      "bus_to_net_conflict": "error",
+      "different_unit_footprint": "error",
+      "different_unit_net": "error",
+      "duplicate_reference": "error",
+      "duplicate_sheet_names": "error",
+      "endpoint_off_grid": "warning",
+      "extra_units": "error",
+      "footprint_filter": "ignore",
+      "footprint_link_issues": "warning",
+      "four_way_junction": "ignore",
+      "global_label_dangling": "warning",
+      "hier_label_mismatch": "error",
+      "label_dangling": "error",
+      "label_multiple_wires": "warning",
+      "lib_symbol_issues": "warning",
+      "lib_symbol_mismatch": "warning",
+      "missing_bidi_pin": "warning",
+      "missing_input_pin": "warning",
+      "missing_power_pin": "error",
+      "missing_unit": "warning",
+      "multiple_net_names": "warning",
+      "net_not_bus_member": "warning",
+      "no_connect_connected": "warning",
+      "no_connect_dangling": "warning",
+      "pin_not_connected": "error",
+      "pin_not_driven": "error",
+      "pin_to_pin": "warning",
+      "power_pin_not_driven": "error",
+      "same_local_global_label": "warning",
+      "similar_label_and_power": "warning",
+      "similar_labels": "warning",
+      "similar_power": "warning",
+      "simulation_model_issue": "ignore",
+      "single_global_label": "ignore",
+      "unannotated": "error",
+      "unconnected_wire_endpoint": "warning",
+      "unit_value_mismatch": "error",
+      "unresolved_variable": "error",
+      "wire_dangling": "error"
+    }
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "attenuator.kicad_pro",
+    "version": 3
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "priority": 2147483647,
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.2,
+        "via_diameter": 0.6,
+        "via_drill": 0.3,
+        "wire_width": 6
+      }
+    ],
+    "meta": {
+      "version": 4
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": []
+  },
+  "pcbnew": {
+    "last_paths": {
+      "gencad": "",
+      "idf": "",
+      "netlist": "",
+      "plot": "",
+      "pos_files": "",
+      "specctra_dsn": "",
+      "step": "",
+      "svg": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "annotate_start_num": 0,
+    "bom_export_filename": "${PROJECTNAME}.csv",
+    "bom_fmt_presets": [],
+    "bom_fmt_settings": {
+      "field_delimiter": ",",
+      "keep_line_breaks": false,
+      "keep_tabs": false,
+      "name": "CSV",
+      "ref_delimiter": ",",
+      "ref_range_delimiter": "",
+      "string_delimiter": "\""
+    },
+    "bom_presets": [],
+    "bom_settings": {
+      "exclude_dnp": false,
+      "fields_ordered": [
+        {
+          "group_by": false,
+          "label": "Reference",
+          "name": "Reference",
+          "show": true
+        },
+        {
+          "group_by": false,
+          "label": "Qty",
+          "name": "${QUANTITY}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Value",
+          "name": "Value",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "DNP",
+          "name": "${DNP}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Exclude from BOM",
+          "name": "${EXCLUDE_FROM_BOM}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Exclude from Board",
+          "name": "${EXCLUDE_FROM_BOARD}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Footprint",
+          "name": "Footprint",
+          "show": true
+        },
+        {
+          "group_by": false,
+          "label": "Datasheet",
+          "name": "Datasheet",
+          "show": true
+        }
+      ],
+      "filter_string": "",
+      "group_symbols": true,
+      "include_excluded_from_bom": true,
+      "name": "Default Editing",
+      "sort_asc": true,
+      "sort_field": "Обозначение"
+    },
+    "connection_grid_size": 50.0,
+    "drawing": {
+      "dashed_lines_dash_length_ratio": 12.0,
+      "dashed_lines_gap_length_ratio": 3.0,
+      "default_line_thickness": 6.0,
+      "default_text_size": 50.0,
+      "field_names": [],
+      "intersheets_ref_own_page": false,
+      "intersheets_ref_prefix": "",
+      "intersheets_ref_short": false,
+      "intersheets_ref_show": false,
+      "intersheets_ref_suffix": "",
+      "junction_size_choice": 3,
+      "label_size_ratio": 0.375,
+      "operating_point_overlay_i_precision": 3,
+      "operating_point_overlay_i_range": "~A",
+      "operating_point_overlay_v_precision": 3,
+      "operating_point_overlay_v_range": "~V",
+      "overbar_offset_ratio": 1.23,
+      "pin_symbol_size": 25.0,
+      "text_offset_ratio": 0.15
+    },
+    "legacy_lib_dir": "",
+    "legacy_lib_list": [],
+    "meta": {
+      "version": 1
+    },
+    "net_format_name": "",
+    "ngspice": {
+      "fix_include_paths": true,
+      "meta": {
+        "version": 0
+      },
+      "model_mode": 4,
+      "workbook_filename": ""
+    },
+    "page_layout_descr_file": "",
+    "plot_directory": "",
+    "space_save_all_events": true,
+    "spice_current_sheet_as_root": false,
+    "spice_external_command": "spice \"%I\"",
+    "spice_model_current_sheet_as_root": true,
+    "spice_save_all_currents": false,
+    "spice_save_all_dissipations": false,
+    "spice_save_all_voltages": false,
+    "subpart_first_id": 65,
+    "subpart_id_separator": 0
+  },
+  "sheets": [
+    [
+      "87671ac2-bffd-47ec-b717-3f83ce2695d3",
+      "Root"
+    ]
+  ],
+  "text_variables": {}
+}

control-panel-for-for-dac/control-panel-for-for-dac.ino

@@ -4,6 +4,10 @@
 // https://www.hackster.io/mircemk/diy-arduino-vfd-display-20x2-vu-volume-unit-meter-37898f
 // https://github.com/AlexGyver/FHTSpectrumAnalyzer/blob/master/Firmware/spertrum1602/spertrum1602.ino
 
+#include <EEPROM.h>
+#include <Wire.h>
+
+
 #define GAIN 5 // усиление 0...50
 #define STEP 20  // плавность полос 0...20
 #define RL 1    // RL - горизонт, вертикаль 0...1
@@ -55,7 +59,9 @@ double prevVolts = 100.0;
 #define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
 #define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
 
-#include <EEPROM.h>
+
+// Адрес PT2257 (0x44 в 7-битном формате, или 0x88 в 8-битном)
+#define PT2257_ADDRESS 0x44
 
 //  LiquidCrystal lcdVuMeter(2, 3, 4, 5, 6, 7);// RS,E,D4,D5,D6,D7
 LiquidCrystal_I2C lcdVuMeter(0x27, 16, 2);
@@ -64,6 +70,9 @@ LiquidCrystal_I2C lcdService(0x26, 16, 2);
 bool usb, bluetooth, mp3;
 int menu = 1;
 bool menuShow = false;
+int att_coax = 0;
+int att_spdif = 0;
+int att_bt = 0;
 
 // ------------------------------------- ПОЛОСОЧКИ -------------------------------------
 byte v1[8] = {0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b11111};
@@ -81,6 +90,13 @@ byte maxValue, maxValue_f;
 float k = 0.1;
 
 void setup() {
+  Wire.begin();
+  // Инициализация PT2257 - сброс и включение
+  writePT2257(0xFF); // Сброс
+  delay(100);
+  writePT2257(0xCE); // Включение (0xCF для выключения)
+  setVolume(79);
+  
   lcdVuMeter.init();
   lcdVuMeter.backlight();
   lcdVuMeter.clear();
@@ -114,20 +130,28 @@ void setup() {
   pinMode(A0,INPUT);// A0 - аналоговый вход R
   pinMode(A1,INPUT);// A1 - аналоговый вход L
 
-  // первый запуск и установка занчений переменных в память
+  // первый запуск и установка значений переменных в память
   if (EEPROM.read(INIT_ADDR) != INIT_KEY) {
-    EEPROM.write(INIT_ADDR, INIT_KEY);
-    usb = true;
-    bluetooth = false;
-    mp3 = false;
-    
-    EEPROM.put(10, usb);
-    EEPROM.put(12, bluetooth);
-    EEPROM.put(14, mp3);
-  } else {
+      EEPROM.write(INIT_ADDR, INIT_KEY);
+      usb = true;
+      bluetooth = false;
+      mp3 = false;
+      att_coax = 0;  // Минимальная громкость
+      att_spdif = 0; // Минимальная громкость  
+      att_bt = 0;    // Минимальная громкость
+      
+      EEPROM.put(10, usb);
+      EEPROM.put(12, bluetooth);
+      EEPROM.put(16, att_coax);
+      EEPROM.put(18, att_spdif);
+      EEPROM.put(20, att_bt);
+    } else {
     usb = EEPROM.read(10);
     bluetooth = EEPROM.read(12);
-//    mp3 = EEPROM.read(14);  
+//  mp3 = EEPROM.read(14);  
+    att_coax = EEPROM.read(16);
+    att_spdif = EEPROM.read(18);
+    att_bt = EEPROM.read(20);
   }
 
   // поднимаем частоту опроса аналогового порта до 38.4 кГц, по теореме
@@ -143,28 +167,23 @@ void setup() {
   analogReference(EXTERNAL);
 
  
-  if (usb) {
-    digitalWrite(RELAY_POWER_BT,HIGH);
-//    digitalWrite(RELAY_POWER_MP3,HIGH);
-    digitalWrite(RELAY_POWER_USB,HIGH);
-    delay(500);
-    digitalWrite(RELAY_OUT_USB,HIGH);
-    digitalWrite(RELAY_OUT_BT,LOW);
-//    digitalWrite(RELAY_OUT_MP3_LEFT,HIGH);
-//    digitalWrite(RELAY_OUT_MP3_RIGHT,HIGH);
-  }
+if (usb) {
+  digitalWrite(RELAY_POWER_BT,HIGH);
+  digitalWrite(RELAY_POWER_USB,HIGH);
+  delay(500);
+  digitalWrite(RELAY_OUT_USB,HIGH);
+  digitalWrite(RELAY_OUT_BT,LOW);
+  applyCurrentVolume(); // Применить громкость после инициализации
+}
 
-  if (bluetooth) {
-    digitalWrite(RELAY_POWER_USB,HIGH);
-//    digitalWrite(RELAY_POWER_MP3,HIGH);
-    delay(500);
-//    digitalWrite(RELAY_OUT_MP3_LEFT,HIGH);
-//    digitalWrite(RELAY_OUT_MP3_RIGHT,HIGH);
-    delay(1000);
-    digitalWrite(RELAY_OUT_USB,LOW);
-    digitalWrite(RELAY_OUT_BT,HIGH);
-    digitalWrite(RELAY_POWER_BT,LOW);
-  }
+if (bluetooth) {
+  digitalWrite(RELAY_POWER_USB,HIGH);
+  delay(500);
+  digitalWrite(RELAY_OUT_USB,LOW);
+  digitalWrite(RELAY_OUT_BT,HIGH);
+  digitalWrite(RELAY_POWER_BT,LOW);
+  applyCurrentVolume(); // Применить громкость после инициализации
+}
   if (mp3) {
      }
   lcdChars();   // подхватить коды полосочек 
@@ -210,9 +229,10 @@ void updateMenu() {
     case 1:
       lcdService.clear();
       lcdService.print("> USB DAC");
-      lcdService.setCursor(2, 1);
+      lcdService.setCursor(0, 1);
       if(usb){
-        lcdService.print("On");
+        lcdService.print("On  Vol: ");
+        lcdService.print(getVolumeLabel(usb ? (att_spdif) : 0));
       }else{
         lcdService.print("Off");
       }
@@ -220,24 +240,36 @@ void updateMenu() {
     case 2:
       lcdService.clear();
       lcdService.print("> Bluetooth");
-      lcdService.setCursor(2, 1);
+      lcdService.setCursor(0, 1);
       if(bluetooth){
-        lcdService.print("On");
+        lcdService.print("On  Vol: ");
+        lcdService.print(getVolumeLabel(bluetooth ? att_bt : 0));
       }else{
         lcdService.print("Off");
       }
       break;
-//    case 3:
-//      lcdService.clear();
-//      lcdService.print(">MP3 module");
-//      lcdService.setCursor(2, 1);
-//      if(mp3){
-//        lcdService.print("On");
-//      }else{
-//        lcdService.print("Off");
-//      }
-//      break;
-    case 3:
+    case 4:
+      lcdService.clear();
+      lcdService.print("> Att S/PDIF");
+      lcdService.setCursor(0, 1);
+      lcdService.print("Level: ");
+      lcdService.print(getVolumeLabel(att_spdif));
+      break;
+    case 5:
+      lcdService.clear();
+      lcdService.print("> Att Coax");
+      lcdService.setCursor(0, 1);
+      lcdService.print("Level: ");
+      lcdService.print(getVolumeLabel(att_coax));
+      break;
+    case 6:
+      lcdService.clear();
+      lcdService.print("> Att BlueTooth");
+      lcdService.setCursor(0, 1);
+      lcdService.print("Level: ");
+      lcdService.print(getVolumeLabel(att_bt));
+      break;
+    case 7:
       menu = 0;
       menuShow = false;
       lcdService.clear();
@@ -245,23 +277,78 @@ void updateMenu() {
   }
 }
 
+String getVolumeLabel(int level) {
+  switch(level) {
+    case 0: return "Max";
+    case 1: return "Med";
+    case 2: return "Min";
+    default: return "Err";
+  }
+}
+int attenuationVolume(int i) {
+  // Циклическое переключение между 0,1,2
+  return (i + 1) % 3;
+}
+int convertAttToVolume(int att) {
+  // PT2257: 0 = максимум громкости, 79 = минимум громкости
+  // Нам нужно: 0 = максимум, 1 = среднее, 2 = минимум
+  switch(att) {
+    case 0: return 0;   // Максимальная громкость (0 dB)
+    case 1: return 1;  // Средняя громкость (40 dB)  
+    case 2: return 2;  // Минимальная громкость (79 dB)
+    default: return 0;
+  }
+}
 void executeMenuAction() {
   switch (menu) {
     case 1:
       actionUSB();
+      // При переключении на USB установите соответствующую громкость
+      applyCurrentVolume();
       break;
     case 2:
       actionBT();
+      // При переключении на Bluetooth установите соответствующую громкость
+      applyCurrentVolume();
+      break;
+    case 4:
+      att_spdif = attenuationVolume(att_spdif);
+      EEPROM.put(18, att_spdif);
+      if (usb && !digitalRead(OPTOCOUPLE_USB)) {
+        setVolume(convertAttToVolume(att_spdif));
+      }
+      break;
+    case 5:
+      att_coax = attenuationVolume(att_coax);
+      EEPROM.put(16, att_coax);
+      if (usb && !digitalRead(OPTOCOUPLE_COAX)) {
+        setVolume(convertAttToVolume(att_coax));
+      }
+      break;
+    case 6:
+      att_bt = attenuationVolume(att_bt);
+      EEPROM.put(20, att_bt);
+      if (bluetooth) {
+        setVolume(convertAttToVolume(att_bt));
+      }
       break;
-//    case 3:
-//      actionMP3();
-//      break;
   }
   EEPROM.put(10, usb);
   EEPROM.put(12, bluetooth);
-//  EEPROM.put(14, mp3);
+  updateMenu(); // Обновляем отображение меню
 }
 
+void applyCurrentVolume() {
+  if (usb) {
+    if (!digitalRead(OPTOCOUPLE_USB)) {
+      setVolume(convertAttToVolume(att_spdif));
+    } else if (!digitalRead(OPTOCOUPLE_COAX)) {
+      setVolume(convertAttToVolume(att_coax));
+    }
+  } else if (bluetooth) {
+    setVolume(convertAttToVolume(att_bt));
+  }
+}
 void actionUSB() {
 //  lcdService.clear();
   lcdService.setCursor(2,1);
@@ -301,25 +388,55 @@ void actionBT() {
 //  delay(1500);
 }
 
-//void actionMP3() {
-////  lcdService.clear();
-//  lcdService.setCursor(2,1);
-//  lcdService.print("On ");
-//  digitalWrite(RELAY_POWER_USB,HIGH);
-//  digitalWrite(RELAY_POWER_BT,HIGH);
-//  delay(500);
-//  digitalWrite(RELAY_OUT_USB,HIGH);
-//  digitalWrite(RELAY_OUT_BT,HIGH);
-//  delay(1000);
-//  digitalWrite(RELAY_OUT_MP3_LEFT,LOW);  
-//  digitalWrite(RELAY_OUT_MP3_RIGHT,LOW);
-//  digitalWrite(RELAY_POWER_MP3,LOW);
-//  usb = false;
-//  bluetooth = false;
-//  mp3 = true;
-//  delay(1500);
-//}
 
+///================== Аттенюатор ===========================
+
+void writePT2257(byte command) {
+  Wire.beginTransmission(PT2257_ADDRESS);
+  Wire.write(command);
+  Wire.endTransmission();
+}
+
+void setVolume(int volume) {
+  // PT2257 принимает ослабление от 0 до 79 dB
+  volume = constrain(volume, 0, 79);
+  
+  // Разделяем на десятки и единицы
+  int tens = volume / 10;
+  int units = volume % 10;
+  
+  // Устанавливаем громкость для левого канала
+  writePT2257(0xD0 + tens);   // Десятки для левого канала
+  writePT2257(0xE0 + units);  // Единицы для левого канала
+  
+  // Устанавливаем громкость для правого канала
+  writePT2257(0x50 + tens);   // Десятки для правого канала
+  writePT2257(0x60 + units);  // Единицы для правого канала
+}
+
+void setVolumeLeft(int volume) {
+  volume = constrain(volume, 0, 79);
+  int tens = volume / 10;
+  int units = volume % 10;
+  
+  writePT2257(0xD0 + tens);
+  writePT2257(0xE0 + units);
+}
+
+void setVolumeRight(int volume) {
+  volume = constrain(volume, 0, 79);
+  int tens = volume / 10;
+  int units = volume % 10;
+  
+  writePT2257(0x50 + tens);
+  writePT2257(0x60 + units);
+}
+
+void mute(bool muteOn) {
+  writePT2257(muteOn ? 0x7D : 0x7E); // Mute/unmute
+}
+
+///=============================================================
 
 uint32_t btnTimer = 0;
 
@@ -398,6 +515,7 @@ void loop() {
       gainTimer = millis();
     }
   }
+//    setVolume(2);
 }
 void analyzeAudio() {
   for (int i = 0 ; i < FHT_N ; i++) {

usb-spdif-output/usb-spdif-output.kicad_pcb

@@ -0,0 +1,2 @@
+(kicad_pcb (version 20211014) (generator pcbnew)
+)

usb-spdif-output/usb-spdif-output.kicad_pro

@@ -0,0 +1,61 @@
+{
+  "board": {
+    "design_settings": {
+      "defaults": {
+        "board_outline_line_width": 0.1,
+        "copper_line_width": 0.2,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "other_line_width": 0.15,
+        "silk_line_width": 0.15,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.15
+      },
+      "diff_pair_dimensions": [],
+      "drc_exclusions": [],
+      "rules": {
+        "min_copper_edge_clearance": 0.0,
+        "solder_mask_clearance": 0.0,
+        "solder_mask_min_width": 0.0
+      },
+      "track_widths": [],
+      "via_dimensions": []
+    }
+  },
+  "boards": [],
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "kicad.kicad_pro",
+    "version": 1
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "nets": [],
+        "track_width": 0.25,
+        "via_diameter": 0.8,
+        "via_drill": 0.4
+      }
+    ],
+    "meta": {
+      "version": 0
+    }
+  },
+  "pcbnew": {
+    "page_layout_descr_file": ""
+  },
+  "sheets": [],
+  "text_variables": {}
+}

usb-spdif-output/usb-spdif-output.kicad_sch

@@ -0,0 +1,5 @@
+(kicad_sch (version 20211123) (generator eeschema)
+  (paper "A4")
+  (lib_symbols)
+  (symbol_instances)
+)