I know that opamps can be unstable when driving capacitive loads. The input to the opamp is more complicated than the schematic shows, but an unfiltered full wave bridge rectifier is the proper waveform. The waveform varies between 0Vpp to 15Vpp. Other circuits need the rectifier waveform. My Voltage to Current chip needs a smoother signal, so the current is more consistent. The opamp is an LM358 built as a buffer so the rectifier waveform doesn't get filtered. The LM358 is powered by 24Vdc.
The issue I am having is the rectified waveform increases its voltage linearly at its own slope. while the smoothed opamp output increases its voltage linearly on another slope. The two slopes intersect at some value determined by the resister and capacitor. How can I get the slopes to be parallel or the same slope?
Is there another circuit that will smooth out a rectified waveform into a DC voltage?