At 17:02 29.04.02, Scott Gravenhorst wrote: >How is this powered, single supply? (LM324?) TL074 at 15/-15V. The trickery here was that the MOSFETs can be also used with swings <600mV _below_ ground, before the protection diodes would become conductive. Cheers, René -- uzs159 at uni-bonn.de http://www.uni-bonn.de/~uzs159