Hi all, Any one know how to build a simple valley peak detector using a zener or schottky diode? I can build a peak detector with either fine. But can't seem to get the valleys? For peak detector, I've used something like show here, http://www.allaboutcircuits.com/vol_3/chpt_3/5.html I also place a resistor parallel to the cap for discharging. Again I can't seem to get a valley detector.