I'm trying to switch high-quality audio signals using 2 serial relays like the picture below.

enter image description here I'm not sure if this is the best solution to switch between 2 inputs and 2 outputs, but here it is. In this case, I'm sure ESD protection is a must. So I'm trying to place fewest TVS diodes at the best location. I thought it would be the best to place it in between 2 relays because regardless of the input/output selected, it will go through the middle. is my thinking on the right track? Do I just have to find the right Diodes now? Any comments or suggestions are welcome on any part of my thought.

  • \$\begingroup\$ It's unlikely that the relays need ESD protection so what are you trying to achieve by using ESD diodes? \$\endgroup\$
    – Andy aka
    Jun 1, 2020 at 15:48
  • \$\begingroup\$ I think the RELAY_SWITCH_Lx pins need ESD protection more than pins 3 and 6. \$\endgroup\$
    – bobuhito
    Jun 1, 2020 at 18:13
  • \$\begingroup\$ @Andyaka I will be turning off all the signal lines when I use the switch, but I'm worried that some voltages might not get fully discharged and strikes ESD when the switch happens. Just like a simple load switch. \$\endgroup\$
    – BrianH
    Jun 2, 2020 at 0:14
  • \$\begingroup\$ @bobuhito It's not showned in the picture, but I'm using ULN2003 Should this be ok? I actually have never used the ULN2003 \$\endgroup\$
    – BrianH
    Jun 2, 2020 at 0:19
  • \$\begingroup\$ @BrianH OK, nevermind, ULN2003 should have ESD protection already on the pins. \$\endgroup\$
    – bobuhito
    Jun 2, 2020 at 2:36


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