If we use a single input RC filter the output square wave voltage frequency is [math]F=\frac{V_{in}}{2.09} \frac{R_2+R_7}{R_4} \frac{1}{R_1 C_1}=0.08134 \frac{V_{in}}{R_{1n}C_{1n}}[/math] with n possible values are 0,1,2 and 3. To change the Frequency range we use the two switches to aligne each resistor with each corresponding capacitor. To maintain stability over time and temperature, observe the...
