Passive multiples, and more

[ADR.eletronics]

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AC/DC Circuit Protection After Jacks

Hi guys! I was encouraged to create this topic to answer a question thought of the end consumer or any uninformed person who plugs anything into any jack… >.< I’m developing this Opto VCA with 3 switchable modes (HPG / Full Range / LPG), and the questions are: 1- Is the connection of the diodes after the Jacks protecting against negative voltages and excessive voltages? 2- Are the diodes after the switch isolating the 2 positions that use the same Op-amp? 3- This Op-Amp from the question ab…