Member • May 2, 2011
If a true UPS (Uninteruupted Power Supply) is connected, then the computer is ALWAYS on UPS. If an inverter is used it is possible that a hum from wave form distortion gets into the act.mreccentricWhen my computer runs on UPS, there is a some continues noise that comes from the speaker, even if it is not plugged to any audio. It works perfectly when it runs on Mains, why this happens?
Member • May 4, 2011
' is used it is possible that a hum from wave form distortion gets into the act'
Member • May 4, 2011
The out put wave form of most commercial inverters is not a true sine wave. This generates other frequencies riding on the main power frequency. This generates an audio hum even from tube lights, fans and such domestic equipment. I was wondering if this applies to your case also.mreccentrichi bioramani,
can please elaborate the part:
Member • May 4, 2011
Member • May 4, 2011
Member • May 4, 2011
I am talking about line conducted harmonics. In the case of tube lights it is the choke that hums.lovejeetis your speaker system too near to the ups????
Member • May 4, 2011
yes i too listened the sound because still my tube light is creating that irritating sound but as per my knowledge sound won't come from speakers because i tested it once i switched off the speakers but still i am able to listen soundbioramaniI am talking about line conducted harmonics. In the case of tube lights it is the choke that hums.
Bioramani
Member • May 4, 2011
NM Garu, If the speaker housing has the power supply of the amplifier it is possible that the transformer in that is making the noise.narayana murthyyes i too listened the sound because still my tube light is creating that irritating sound but as per my knowledge sound won't come from speakers because i tested it once i switched off the speakers but still i am able to listen sound
Member • May 5, 2011
Member • May 6, 2011
In our company we were recently setting up a video conferencing facility. We found that the SMPS in some models was leading to a hum in the audio and a waving display, while others did not. It is the Electro Magnetic Interference, which can be radiating or line conducted, which sets up this disturbance. When talking on a landline any near by cell phone getting an incoming call sets up a disturbance, even though there is no connection.mreccentricOne thing, i'm sure that the sound is from the speaker. I don't hear that from UPS(Inverter). How can Speaker's sound depend on sine wave?
So, my ques is: 'Why wont that happen to normal frequency of 50/60Hz?,(if it can happen to other frequencies)' I can even see some lines moving from up to down in my PC's monitor. As it happens when you capture it using a video camera.
