<https://forum.allaboutcircuits.com/threads/effective-agc-amplifier.1767/>
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"Hello,\n\nI've used a modified version of the following AGC circuit:\n\nhttp://www.elecdesign.com/Articles/Index.c...&ArticleID=6272\n\nI'm a bit rusty with my circuit analysis capabilities and am struggling to figure out how to determine the Output Resistance of this circuit.\n\nAny help would be greatly appreciated!!"
<https://forum.allaboutcircuits.com/threads/effective-agc-amplifier.1767/>