I have an extra credit problem where I need to find an AGC circuit online and modify it to meet certain design parameters. I need to show that it meets these requirements in MultiSim. So far I have been using http://www.longrope.com/circuits/new_page_2.htm (circuit II) with all the +12V changed to +9 V. From this I get my input sine wave with about half peak to peak voltage floating up around 3.5V. Is there a better AGC circuit out there that I should use (such as one where there is no DC offset on the output)? Otherwise, how would I go about modifying this one?