hey guyz, can you help me in my project. we are required to present a working adc circuit in our class. The adc circuit that i choose was a delta-sigma adc. i found a circuit on the web (http://www.allaboutcircuits.com/vol_4/chpt_13/9.html) but i'm having a hard time making it work. Do know any delta-sigma adc circuit that actually work.