This program introduces various optional methods for deriving the equation of the Sallen-Key low-pass filter using Maplesoft products.

This document will introduce several methods for modeling circuit equations:

1. Impedance-based circuit equation modeling using Kirchhoff's laws.
2. Differential equation-based circuit equation modeling using Kirchhoff's laws.
   
Two methods for deriving the transfer function from the system of differential equations:
   2.1 Solving using Laplace transform.  
   2.2 Solving using built-in DynamicSystem functions.  

3. Modeling and extracting differential-algebraic equations in MapleSim.  
4. Modeling and extracting equations using the Syrup library.