PIC
Microcontroller
Output
Methods
for
Digital to Analog Conversion
Analog Output with jumper settings for voltage and current ranges
See:
PWM
See also:
http://www.edtn.com/embapps/emba057.htm
Digital Frequency Synthesis
http://www.bytecraft.com/addaconv.html
ByteCraft:Software A/D and D/A Converters,