input: import numpy as np
  
  freq = 250
  amplitude = 1
  
  t = np.linspace(0, 1, 1000)
  voltage_signal = np.sin(2 * np.pi * freq * t) + np.random.normal(0, 0.1, 1000)
output:     
  import matplotlib.pyplot as plt
  
  plt.figure(figsize=(10, 5))
  plt.plot(t, voltage_signal)
  plt.title('Voltage Signal with Noise')
  plt.xlabel('Time (s)')
  plt.ylabel('Voltage (V)')
  plt.grid(True)
  plt.show()
  