Hi Corona688...
No.
It is a series C loaded into 1M in the open cct O/P in the diagram. It is not a shunt C.
The series C and shunt R is a effectively a high pass filter but with a very low LF cut off frequency of around 5Hz. This is so as to maintain the shape of the SQ wave on the O/P.
An external load of 100K will make little or no difference to the O/P.
The C is effectively a short cct to AC but _infinite_ 'resistance' at DC.
The SQ wave is fed into the series C and the O/P follows the input with almost no attenuation at all. The I/P is grounded in this case through 100K.
When the DC voltage is 0V on the I/P the O/P is also 0V.
Any +ve DC voltage on the I/P is reflected on the O/P as an identical waveform to the I/P of the same amplitude BUT is now AC coupled on the O/P. Remember the C is effectively a S/C at 2KHz. In other words a 2V DC I/P will become 2V P-P centred about 0V. The peak amplitude remains the same. This makes for ultra-simple sampling and decoding through the sound card.
(Reactance); Xc=1/(2*PI*f*C) where f is in Hz C is in Farads.
So its reactance, (AC__resistance__)......
Xc=1/(2*PI*2000*(10^-6))
This is around 80 ohms. Effectively a S/C to AC but completely blocks any DC component.
However The DC component is now a copy of the I/P but centred around real 0V. That is 2V DC relative to 0V is equivalent to +1V and -1V centred on 0V.
Hope this makes sense...
I have been doing this stuff for at least 20 years on differing platforms.
Here is a GIF anim of a full application I wrote for the AMIGA and finshed in 2001:-
http://wisecracker.host22.com/public/SCOPE.GIF
It has a GUI of its own, buttons that stay depressed when _pushed_. The waveform is a real one generated from a second AMIGA. And a FULL project for anyone to build on AMINET. A fully calibrated DC - 100KHz Oscilloscope where everything inculding simple calibration gear is built. This was aimed at the more experienced constructor.
Bazza...