Hi, Get the app note. One of the best I´ve seen. http://www.national.com/an/AN/AN-72.pdf (the 2900 and 3301 are discontinued, but the LM359 is still on the road) Edu Silva Scott Gravenhorst wrote: > > Anyone care to give a short disertation on "dos and don'ts", > what are they the best thing for and what are they the > worst thing for ?