> To achieve proper operation of the operational amplifier I need at least
> +8V and -8V voltages.

WZab, is that really necessary ? I've several applications using +/- 5V rails

http://home.clear.net.nz/pages/joecolquitt/lo_volt_DC.gif

Vee is got from a simple diode-capacitor inverter (which gets very close
to - Vcc) and an oscillating PIC pin

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist