At 08:49 AM 4/29/03 -0300, Francisco Ares wrote: >AFAIK, RS232 may have signals as high as 12 V positive *AND* negative, >so the 4066 should have its power supply of at least 24 V and its Vss >pin at -12V refered to the system ground. I see that you enjoy the sound of chips exploding like firecrackers. Do keep in mind that the absolute maximum voltage between Vdd & Vss is either 15 Vdc or 18 Vdc, depending upon manufacturer. Applying 36 Vdc between Vdd & Vss is going to cause interesting things to happen. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 19 years of Engineering Innovation (1984 - 2003) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.