diff --git a/velleman_voice_changer/docs/8950v110.pdf b/velleman_voice_changer/docs/8950v110.pdf
new file mode 100644
index 0000000..87638b2
Binary files /dev/null and b/velleman_voice_changer/docs/8950v110.pdf differ
diff --git a/velleman_voice_changer/docs/voice-modulation-circuit-ht8950.png b/velleman_voice_changer/docs/voice-modulation-circuit-ht8950.png
new file mode 100644
index 0000000..47d2b58
Binary files /dev/null and b/velleman_voice_changer/docs/voice-modulation-circuit-ht8950.png differ
diff --git a/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_pcb b/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_pcb
new file mode 100644
index 0000000..28b47a1
--- /dev/null
+++ b/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_pcb
@@ -0,0 +1,2 @@
+(kicad_pcb (version 20211014) (generator pcbnew)
+)
\ No newline at end of file
diff --git a/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_prl b/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_prl
new file mode 100644
index 0000000..78ebe43
--- /dev/null
+++ b/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_prl
@@ -0,0 +1,75 @@
+{
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+    "active_layer_preset": "",
+    "auto_track_width": true,
+    "hidden_nets": [],
+    "high_contrast_mode": 0,
+    "net_color_mode": 1,
+    "opacity": {
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+      "tracks": 1.0,
+      "vias": 1.0,
+      "zones": 0.6
+    },
+    "ratsnest_display_mode": 0,
+    "selection_filter": {
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+      "footprints": true,
+      "graphics": true,
+      "keepouts": true,
+      "lockedItems": true,
+      "otherItems": true,
+      "pads": true,
+      "text": true,
+      "tracks": true,
+      "vias": true,
+      "zones": true
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+      34,
+      35,
+      36
+    ],
+    "visible_layers": "fffffff_ffffffff",
+    "zone_display_mode": 0
+  },
+  "meta": {
+    "filename": "velleman_voice_changer.kicad_prl",
+    "version": 3
+  },
+  "project": {
+    "files": []
+  }
+}
diff --git a/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_pro b/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_pro
new file mode 100644
index 0000000..90f0f2d
--- /dev/null
+++ b/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_pro
@@ -0,0 +1,326 @@
+{
+  "board": {
+    "design_settings": {
+      "defaults": {
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+        "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": []
+    },
+    "layer_presets": []
+  },
+  "boards": [],
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "erc": {
+    "erc_exclusions": [],
+    "meta": {
+      "version": 0
+    },
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+      "bus_entry_needed": "error",
+      "bus_label_syntax": "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",
+      "extra_units": "error",
+      "global_label_dangling": "warning",
+      "hier_label_mismatch": "error",
+      "label_dangling": "error",
+      "lib_symbol_issues": "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",
+      "similar_labels": "warning",
+      "unannotated": "error",
+      "unit_value_mismatch": "error",
+      "unresolved_variable": "error",
+      "wire_dangling": "error"
+    }
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "velleman_voice_changer.kicad_pro",
+    "version": 1
+  },
+  "net_settings": {
+    "classes": [
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+        "clearance": 0.2,
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+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
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+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.25,
+        "via_diameter": 0.8,
+        "via_drill": 0.4,
+        "wire_width": 6.0
+      }
+    ],
+    "meta": {
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+    },
+    "net_colors": null
+  },
+  "pcbnew": {
+    "last_paths": {
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+      "idf": "",
+      "netlist": "",
+      "specctra_dsn": "",
+      "step": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "annotate_start_num": 0,
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+      "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,
+      "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,
+      "fix_passive_vals": false,
+      "meta": {
+        "version": 0
+      },
+      "model_mode": 0,
+      "workbook_filename": ""
+    },
+    "page_layout_descr_file": "",
+    "plot_directory": "",
+    "spice_adjust_passive_values": false,
+    "spice_external_command": "spice \"%I\"",
+    "subpart_first_id": 65,
+    "subpart_id_separator": 0
+  },
+  "sheets": [
+    [
+      "8a722f2c-d825-437e-ace6-302c5acff9a0",
+      ""
+    ]
+  ],
+  "text_variables": {}
+}
diff --git a/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_sch b/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_sch
new file mode 100644
index 0000000..4594ed4
--- /dev/null
+++ b/velleman_voice_changer/kicad/velleman_voice_changer/velleman_voice_changer.kicad_sch
@@ -0,0 +1,1533 @@
+(kicad_sch (version 20211123) (generator eeschema)
+
+  (uuid 8a722f2c-d825-437e-ace6-302c5acff9a0)
+
+  (paper "A4")
+
+  (lib_symbols
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+      (property "Reference" "U" (id 0) (at 1.27 7.62 0)
+        (effects (font (size 1.27 1.27)) (justify left))
+      )
+      (property "Value" "LM386" (id 1) (at 1.27 5.08 0)
+        (effects (font (size 1.27 1.27)) (justify left))
+      )
+      (property "Footprint" "" (id 2) (at 2.54 2.54 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "Datasheet" "http://www.ti.com/lit/ds/symlink/lm386.pdf" (id 3) (at 5.08 5.08 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_keywords" "single Power opamp" (id 4) (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_description" "Low Voltage Audio Power Amplifier, DIP-8/SOIC-8/SSOP-8" (id 5) (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_fp_filters" "SOIC*3.9x4.9mm*P1.27mm* DIP*W7.62mm* MSSOP*P0.65mm* TSSOP*3x3mm*P0.5mm*" (id 6) (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (symbol "LM386_0_1"
+        (polyline
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+            (xy -5.08 5.08)
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+            (xy 5.08 0)
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+          (stroke (width 0.254) (type default) (color 0 0 0 0))
+          (fill (type background))
+        )
+      )
+      (symbol "LM386_1_1"
+        (pin input line (at 0 -7.62 90) (length 5.08)
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+          (number "8" (effects (font (size 1.27 1.27))))
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+        (effects (font (size 1.27 1.27)))
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+      (property "Value" "AudioJack2" (id 1) (at 0 6.35 0)
+        (effects (font (size 1.27 1.27)))
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+      )
+      (property "Datasheet" "~" (id 3) (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
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+      (property "ki_keywords" "audio jack receptacle mono phone headphone TS connector" (id 4) (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_description" "Audio Jack, 2 Poles (Mono / TS)" (id 5) (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_fp_filters" "Jack*" (id 6) (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (symbol "AudioJack2_0_1"
+        (rectangle (start -3.81 0) (end -2.54 -2.54)
+          (stroke (width 0.254) (type default) (color 0 0 0 0))
+          (fill (type outline))
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+          (stroke (width 0.254) (type default) (color 0 0 0 0))
+          (fill (type none))
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+      (symbol "AudioJack2_1_1"
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+      )
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+      )
+      (property "ki_description" "DC Barrel Jack" (id 5) (at 0 0 0)
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+      (property "ki_fp_filters" "BarrelJack*" (id 6) (at 0 0 0)
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