No. to discharge a capacitor you don´t need voltage steps 2.5V, 2.0V, 1.0V ....because the voltage automatically goes down because of the dicharge current.The same (or similar) is with the OPAMP output....it automatically creates the necessary voltage .No steps. Analog.I was trying to think about it last night, and think the solution in post #2 - for a 5V supply - would need the input signal from the pushbutton(s) to be limited by say a TL431 to 2.5V and fed into a non-inverting integrator biased at mid-supply to produce the input signal to the capacitor-charging op amp to get the incremental 1V, 2V, 2.5V signal from a pushbutton pulse of varying duration, wouldn't it?
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