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dgbint · 03-09-2019, 01:29 AM

I think ( but don't know for sure ) that there's small switch mode power supply within the battery pack.
It probably runs at 10KHz or so, just in the region where humans can hear it.
Under certain load conditions, yes you can hear that 'tune'.

03-09-2019, 01:29 AM	#11
dgbint Member Join Date: Apr 2003 Location: Melbourne, VIC, Australia. Posts: 991	Swtich Mode I think ( but don't know for sure ) that there's small switch mode power supply within the battery pack. It probably runs at 10KHz or so, just in the region where humans can hear it. Under certain load conditions, yes you can hear that 'tune'.