I need a cheap signal generator, and, if I am not mistaken, the ATMEGA8 based projects(here) always use only positive rail, with that resistor thing (many resistors)...
My doubts are:
1 - If I buy stand-alone resistors, can I build them to do the same effect of that component(that is not available in my region)?
2 - Is there a way to build that kind of project with full rail-to-rail signal(-5; 0 ;+5)? Any OPAMP, maybe?
Thank You guys!