I'm trying to build a device to test a proportional valve. This valve requires a 24v input and a control signal that ranges from -10v to +10v. I've read up getting an analog voltage from a pmw signal, and read up on charge pumps to get a negative voltage. But all of this is sort theory, and I don't really understand it fully..... So what attached components would I need to do something like this? Or maybe just a research topic pointer...
Any info would be great and most appreciated.