Timeline for Opamp + NPN and MOSFET in the feedback network, how to prevent oscillations

10 events

when toggle format	what		by	license	comment
Dec 5, 2018 at 22:24	comment	added	anrieff		It is the PIC MCU built-in peripheral, so it can be either the resistor string (high-impedance, I think 200k worst-case for the mid-point value), or that, but buffered by the built-in opamp (so RRIO opamp-grade, say 20-ish ohms, but degrades near the rails).
Dec 5, 2018 at 21:40	comment	added	Glenn W9IQ		Ok, good additional information. What is the output impedance of your DAC?
Dec 5, 2018 at 21:40	history	edited	Glenn W9IQ	CC BY-SA 4.0	edited body
Dec 5, 2018 at 21:30	comment	added	anrieff		Unfortunately my device could be turned off, in which case it is desired that the pot control works as if my device didn't exist. In that case, there'd be noone generating Vlimit_in to the pot. I don't have a 5V rail in my device, too, and I don't want to use the 5V from the cable to the pot. In general, I think the "add a resistor in the signal line, and add programmable pull-down circuitry on the ESC side" is the best approach for this project for a number of reasons.
Dec 5, 2018 at 20:57	history	undeleted	Glenn W9IQ
Dec 5, 2018 at 20:57	history	edited	Glenn W9IQ	CC BY-SA 4.0	added 301 characters in body
Dec 5, 2018 at 14:21	history	deleted	Glenn W9IQ		via Vote
Dec 5, 2018 at 14:16	history	edited	Glenn W9IQ	CC BY-SA 4.0	added 220 characters in body
Dec 5, 2018 at 14:10	history	edited	Glenn W9IQ	CC BY-SA 4.0	added 220 characters in body
Dec 5, 2018 at 14:01	history	answered	Glenn W9IQ	CC BY-SA 4.0