I'm experimenting with analog switches/muxes ('4051 and '4066)--my first time. When selected, the resistance of all switches is as expected, <150 ohms, but when control signal is low R varies from 20-50K among channels, always way lower than spec. If power removed, all channels' resistance is in spec. My first thought was my meter, a garden-variety $20 job, but it seems to be working fine. Thanks all, Don =============== Don Rahmlow Ramfish Golf www.ramfish.com =============== -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist