You might have already come across an Electrode Input Box (EIB). In the past, the main function of the EIB was to enable the use of touch-proof (1.5 mm DIN) electrodes with either BrainAmp or actiCHamp Plus systems. If your lab already has both actiCHamp Plus and BrainAmp equipment, you might find the new EIB64-DUO from Easycap particularly interesting for your passive electrode setup!