Hi, I have a problem I need to understand. Probably the question will be simple If explained in a simple way, and for this reason I chose this section. Very often it happens that the output voltage of the signal of one amplification stage is lowered once hooked to the next amp stage, even with a coupling capacitor. It often happens to me with discrete components like JFETs or transistors, and a little less with opamps. It is probably a physiological behavior of the signal chain, but I would like to understand why, otherwise I can not carry out some of my projects. Thank you for your contribution!