Double trace video oscilloscope

Input signal applied to the CHA: sine wave signal that varies from ~ 1 KHz to 3 KHz and then switches to triangular wave then square wave, then triangular wave to return to sinusoidal at the frequency of 1 KHz.:

Input signal applied to the CHB: sinusoidal signal that follows the same frequency as the CHA

 

 

 

 

Below: block diagram