Everyone, I appreciate your input 1st and foremost. I am new to designing circuits, and was looking to see if there is a general rule of thumb. What I am looking to do is get input from one serial (232) input and using an AND gate switch between two outputs using a PIC to set the second input of the gate high (the 232 input on the other.) I know I cannot simply wire them straight together, I will need some resistance and capacitance somewhere, I was trying to figure out where without having someone else answer the question for me. This is why I was looking for a general rule of thumb on using resistors and caps. Also LED get REALLY REALLY bright before they blow. 8-) Keith --- Aaron Blohowiak wrote: > checkit: > > http://faculty.millikin.edu/~jaskill.nsm.faculty.mu/newphyslab9.html > http://www.deas.harvard.edu/courses/es154/pages/nicetut/ > http://www.pcguide.com/intro/fun/components-c.html > http://www.gae.ucm.es/~padilla/extrawork/electronics.html > http://www.saburchill.com/tech/adobe/001.pdf > > (if i can find all this in 5 min using google, so > can you =) [assuming you > have a cable modem, maybe 10 mins if you dont;)]) > > Aaron > [snip] > > I guess the question is: > > > > I would use a capacitor when (or if) . . . > > > > I would use a resistor when (or if ) . . . > [/snip] > > -- > http://www.piclist.com hint: PICList Posts must > start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other > [BUY]:,[AD]: ->Ads > > __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads