I am trying to improve my 200VDC power supply by making a simple linear regulator....nothing is ever simple... http://en.wikipedia.org/wiki/Linear_regulator Ok so I have this zener based relator with a BJT working with a 1 Meg pot across the zener, the base of the bjt is hooked up to the wiper of the pot. But the output voltage slowly creeps up. I think this may be due parts heating up... not sure. The load is 40kOhm and the output voltage of the regulator is 200VDC. Can I add negative feedback to mitigate this creeping output? How would you do it?