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JE Adams Combo Vac silver button high failure rate

I use E-Switch's red ring LED switches for Nayax external stop. Nayax outputs ~5vdc. I install a 330-350ohm resistor in series to prevent LED burnout.

I checked the illumination voltage output on a Cryptopay swiper and it was right at 2VDC. The red illuminated ring E-Switch buttons are rated at 1.8V so I'm going to let that go without a resistor. Someday I'll check the voltage of the JE Adams board output to see if it is too high for the Bulgin buttons.
 
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