Omer, If you just want to switch high voltage ON or OFF I would use a FET ckt to do that. I would only use the analog switches if you have an analog signal that needs to be switched without loosing too much of the signal. I would check the specs closely, the current draw of whatever you're switching too and the voltage level might be too much. Steve >>> oyalhi@TEKSAN.COM.TR 4/22/2004 12:33:23 PM >>> The analog switches that I have recently found, opened a new window for me. Could I use the analog switches, like MAX323, like a relay? To better explain what I am thinking, if I have circuit that works with 3V, could I use the switch to close and open a 24V line coming from outside world, thus imititating the SPST relay? Thanks in advance, Omer -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics