6-7 volts seems pretty low for PS-2 or 3 boards and winds up drawing a higher current flow. Plus you intentionally had the motor in a stall condition at that voltage. I always power up to 10V and then up to 12 once started up. It was always brown out that damaged sensitive electronics in my prior life. Not clean breaks in power. So I am leery of trying to run electronics at a marginal voltage. G
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