I have been having a problem with my computer speakers. They, for no apparent reason, start buzzing very loudly. I've determined that, if the speakers are powered with a slightly high power line voltage, they will indeed buzz. I tested this by plugging the wall wart into a Variac and monitoring the voltage with a DMM, not true RMS, actually a Fluke 8020A.. At about 126 volts, the buzzing starts. Today I came into the house and noticed beeping from my computer's UPS. It was definitely in the "power out of range, use the batteries" mode. The inverter was humming and there was some heat coming from the heat vents on the UPS. After checking around I measured the line voltage at 127 volts. I thought this was a bit high so I called the power company. They indicated that this was NOT considered high, but are sending out a tech anyway. So, my question to all you experts out there, what is considered high? My UPS thinks it's high. My speakers don't work, but, I know they are cheapies.
- posted
13 years ago