EQMOD does not require minimum 4V, if that information is on the website then it is incorrect. The mount requires the correct logic conversion whether it is 1.8, 3.3 or 5V. (1.8V is experimental ATM)
EQ5 and 6 mounts require a minimum 4 V to make it work not the other way around.
I would check the specs properly on the EQ8 if it is 3.3V then many people have it connected wrong. It may work OK for a period of time but may fail very early voiding any warranty.
3.3V is also a high speed logic level so running at 5V will limit the speed of communications as well.
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