can u suggest a few design for a ramping circuit. using 741 op-amp. from 0volts to 4volts(when switched on) with the rise time 200msec. all in DC. i really need ur help coz' i can't find any circuits anywhere. i will really appreaciate it!!! thanks alot yours, john RMIT Australia ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com