diff --git a/dcs/frames/__init__.py b/dcs/frames/__init__.py
index 533546c..f6aa703 100644
--- a/dcs/frames/__init__.py
+++ b/dcs/frames/__init__.py
@@ -8,11 +8,13 @@
 from . import base
 
 from .ch02_phasor import Ch02PhasorWindow
+from .ch02_fourier import Ch02FourierWindow
 
 
 def get_windows() -> List[Type[base.Window]]:
     return [
         Ch02PhasorWindow,
+        Ch02FourierWindow,
     ]
 
 
diff --git a/dcs/frames/ch02_fourier.py b/dcs/frames/ch02_fourier.py
new file mode 100644
index 0000000..b982cec
--- /dev/null
+++ b/dcs/frames/ch02_fourier.py
@@ -0,0 +1,172 @@
+#  SPDX-License-Identifier: MPL-2.0
+#    Copyright (c) 2022 Philipp Le <philipp@philipple.de>.
+#  This Source Code Form is subject to the terms of the Mozilla Public
+#  License, v. 2.0. If a copy of the MPL was not distributed with this
+#  file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+from __future__ import annotations
+
+from tkinter import ttk, LEFT, BOTH
+from pydantic import confloat
+from dcs.config import default_store, ConfigObject, ui_create, ConfigControlFrame
+import numpy as np
+from dcs.frames.base import BaseFrame, Window
+from dcs.frames.groups import Ch02Group
+from typing import List
+
+import matplotlib
+matplotlib.use('TkAgg')
+from matplotlib.figure import Figure
+from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
+
+
+class ConfigCh02FourierFrame(ConfigControlFrame):
+    wdg_abs_input: List[ttk.Spinbox]
+    wdg_phas_input: List[ttk.Spinbox]
+
+
+@ui_create
+class ConfigCh02Fourier(ConfigObject):
+    _KEY = 'ch02_fourier'
+
+    n0_abs: confloat(ge=-5.0, le=5.0, multiple_of=0.01) = 0.0
+
+    n1_abs: confloat(ge=0.0, le=5.0, multiple_of=0.01) = 1.0
+    n1_phas: confloat(ge=-180.0, le=180.0, multiple_of=0.1) = 0.0
+
+    n2_abs: confloat(ge=0.0, le=5.0, multiple_of=0.01) = 0.0
+    n2_phas: confloat(ge=-180.0, le=180.0, multiple_of=0.1) = 0.0
+
+    n3_abs: confloat(ge=0.0, le=5.0, multiple_of=0.01) = 0.0
+    n3_phas: confloat(ge=-180.0, le=180.0, multiple_of=0.1) = 0.0
+
+    n4_abs: confloat(ge=0.0, le=5.0, multiple_of=0.01) = 0.0
+    n4_phas: confloat(ge=-180.0, le=180.0, multiple_of=0.1) = 0.0
+
+    n5_abs: confloat(ge=0.0, le=5.0, multiple_of=0.01) = 0.0
+    n5_phas: confloat(ge=-180.0, le=180.0, multiple_of=0.1) = 0.0
+
+    n6_abs: confloat(ge=0.0, le=5.0, multiple_of=0.01) = 0.0
+    n6_phas: confloat(ge=-180.0, le=180.0, multiple_of=0.1) = 0.0
+
+    n7_abs: confloat(ge=0.0, le=5.0, multiple_of=0.01) = 0.0
+    n7_phas: confloat(ge=-180.0, le=180.0, multiple_of=0.1) = 0.0
+
+    n8_abs: confloat(ge=0.0, le=5.0, multiple_of=0.01) = 0.0
+    n8_phas: confloat(ge=-180.0, le=180.0, multiple_of=0.1) = 0.0
+
+    n9_abs: confloat(ge=0.0, le=5.0, multiple_of=0.01) = 0.0
+    n9_phas: confloat(ge=-180.0, le=180.0, multiple_of=0.1) = 0.0
+
+    def calc_vec(self, n: int, t: np.ndarray | int = 0) -> complex:
+        if n > 0:
+            phas = getattr(self, f'n{n}_abs') * np.exp(1j * getattr(self, f'n{n}_phas') * np.pi / 180)
+        else:
+            phas = getattr(self, f'n{n}_abs')
+        t = np.exp(1j * 2 * np.pi * n * t)
+        return phas * t
+
+    def ui_create_abs(self, n: int, frm):
+        ui_create = getattr(self, f'ui_create_n{n}_abs')
+        return ui_create(frm)
+
+    def ui_create_phas(self, n: int, frm):
+        ui_create = getattr(self, f'ui_create_n{n}_phas')
+        return ui_create(frm)
+
+    def make_config_widget(self, parent: ttk.Widget) -> ConfigControlFrame:
+        frm = ConfigCh02FourierFrame(parent, borderwidth=1, relief='raised')
+
+        frm.wdg_abs_input = []
+        frm.wdg_phas_input = []
+
+        for idx in range(10):
+            ttk.Label(frm, text=f'n = {idx}:').grid(row=idx, column=0)
+
+            wdg_abs = self.ui_create_abs(idx, frm)
+            wdg_abs.grid(row=idx, column=1)
+            frm.wdg_abs_input.append(wdg_abs)
+
+            if idx > 0:
+                ttk.Label(frm, text='Phase:').grid(row=idx, column=2)
+
+                wdg_phas = self.ui_create_phas(idx, frm)
+                wdg_phas.grid(row=idx, column=3)
+                frm.wdg_phas_input.append(wdg_phas)
+
+                ttk.Label(frm, text='°').grid(row=idx, column=4)
+
+        return frm
+
+
+class Ch02FourierFrame(BaseFrame):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        self._config = default_store().get_config(ConfigCh02Fourier)
+
+        self.ctrl_frm = self._create_control()
+        self.ctrl_frm.pack(side=LEFT)
+
+        signal_frm = self._create_signal_canvas()
+        signal_frm.pack(expand=True, fill=BOTH)
+
+    def _create_control(self) -> ConfigCh02FourierFrame:
+        frm = self._config.make_config_widget(self)
+        for wdg in frm.wdg_abs_input:
+            wdg.listen_change(self._on_change)
+        for wdg in frm.wdg_phas_input:
+            wdg.listen_change(self._on_change)
+        return frm
+
+    def _on_change(self, _, __, ___):
+        default_store().save()
+        self.draw_signal()
+
+    def _create_signal_canvas(self) -> ttk.Widget:
+        frm = ttk.Frame(self)
+
+        self._signal_fig = Figure(figsize=(12, 6), dpi=100)
+
+        self._signal_canvas = FigureCanvasTkAgg(self._signal_fig, frm)
+        self._signal_canvas.get_tk_widget().pack(expand=True, fill=BOTH)
+
+        self.draw_signal()
+
+        return frm
+
+    def draw_signal(self):
+        LENGTH = 200
+
+        self._signal_fig.clear()
+        ax = self._signal_fig.add_subplot(1, 1, 1)
+        ax.set_xlim(-1.2, 1.2)
+        ax.set_xlabel('time')
+        ax.set_ylabel('value')
+        ax.set_title('Signal')
+
+        t = np.linspace(-1.0, 1.0, LENGTH)
+
+        x = np.zeros((10, LENGTH))
+        for n in range(10):
+            x[n, :] = self._config.calc_vec(n, t)
+
+        s = np.sum(x, axis=0)
+
+        ax.plot(t, s, label='Sum', linestyle='solid', linewidth=3)
+        for n in range(10):
+            ax.plot(t, x[n, :], label=f'n = {n}', linestyle='solid', linewidth=1)
+        ax.legend()
+
+        self._signal_canvas.draw()
+
+
+class Ch02FourierWindow(Window):
+    GROUP = Ch02Group
+    TITLE = 'Fourier Series'
+    FRAME = Ch02FourierFrame
+
+
+if __name__ == '__main__':
+    Ch02FourierWindow.main()
+