share DRL electrode possible?

 Hello,

 i am currently building a 4 channel eeg loosely based on the modularEEG 
 design.
 i am planning to also use it as a 2 person monitoring device.
 my question is: would i need 2 dlr circuits for that or can 2 people be
 connected to the same dlr input?

 Thanks in advance,
 yours,
 jan

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