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Re: BUZZING NOISE LIKE 60 CYCLE HUM, CHECKED CORDS AND...
When the speaker is connected only at the power line does it makes this noise?
If it does it's an internal amplifier's ploblem and you have to check out some fittings (electrolytic capacitorsat the power supply, power supply transformer, voltage stabilizers e.t.c.)
If the speaker is quiet you have to check your external wiring because there is a loop ground. That means that one "ground level" line is connected at the ground by two or more cables (e.g. the audio ground and the grond from the mains power source) In this case disconnect the second (and the 3rd e.t.c.) grounding point.
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Thanks and regards Please kindly rate this solution Stelios direct FixYa link: http://www.fixya.com/users/technical114
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call in an electrician as it may be the start/run capacitor for the motor ( indicated by motor humming but not running)
the gearing will make it very difficult to turn the blades by hand as the motor will be spinning at either 1400 rpms or 2400 rpms down to around 50 rpms for the blades
If the mixer is still running and making the buzzing noise one of the electrical contactors is making the noise and should be replaced.
If the mixer is not running and just making a buzzing noise it can be because off single phasing, check the incoming supply to the mixer and make shore you get the right voltage to the motor (test on motor connection terminals)if the voltage to the motor is right the motor might be faulty
so its a buzzing noise. are your turntables grounded? some dont have to be. the buzzing could be several things feedback from something around you or the mixer is buzzing cause of to much power. just mess around w stuff your not gonna break it. and what i mean about that is more wires check wires. dont preform open heart surgery on your equptment. sometimes the buzzing means the faders are going i own 3 vestax mixers and on my pmc 17a right before the faders went i had massive buzzing sound.
You are looking at the WRONG end of the guitar cable. You have a VERY unsafe guitar amplifier OR the mixer that is connected to that mic has an UNSAFE grounding condition.
If your guitar amp is an old one that has a two wire cord and a switch you change to reduce hum, take it in to have a three wire power cord installed IMMEDIATELY. Only plug into grounded receptacles. This is needed to reduce electrical noise and hum but MORE importantly is personel safety.
If the problem is with the mixer and the electrical service to the mixer, better get a professional in to analyze the problem before somebody is injured.
AS A START do this: VERIFY that ALL interconnected equipment INCLUDING your guitar amp iis powered from the same source or receptacle. This includes the venue power amps, mixer, any CD players, etc. Professionals run power back from the stage source to the mixer alongside their snake to avoid just the problem you are seeing. When they need more power at a venue, a power distribution box is used that conditions the building power and insures grounding.
How to Eliminate the Hum and Buzz from your Sound System
Is your sound system making noises you don't want to hear? Try these tips to clear it up!
Hum is usually the result of using electrical outlets with different grounds. To verify this, run an extension cord from the outlet that the amplifiers are plugged in, to the mixer.
Remove all the DI boxes and adapters. Connect the mixer to the amplifiers with balanced cables.
Be sure that all your cables and connectors are correctly wired:
Pin 1 shield Pin 2 + white/red Pin 3 - black
Note: If the system has an electronic crossover, equalizer, or limiter....you need to keep them in the signal chain to protect the system from damage. Just make sure all the cables are balanced and the pin-out on the connectors is correct.
If your gear doesn't have balanced connections use good shielded cables with the proper connectors.... NO ADAPTORS!!!
If the system still has noise, check each channel on the mixer by removing the input connections. There may be a DI box on stage that is also interacting and causing a ground loop. If that is the case try a different DI and make sure that all the instruments and amps on stage are also on the same dedicated ground as the mixer and amplifiers.
If the hum is gone using the extension cord you will need the have your electrician run a dedicated ground to the mixer and amplifier electrical plugs.
Simple Static Eliminationarcalian.com Is static causing problems in your reel-to-reel (web) process?
Tips & Warnings
* Removing the DI boxes, hum eliminators and bad cables may improve the sound quality...unless the DI boxes use very expensive line level transformers (Good ones are about $75 for just the raw transformer inside the box) the signal is being squished thru a $5 instrument level DI box. * DO NOT lift the grounds on any of the AC inputs to the amps or the mixer as this could result in electrocution. OUCH!
is it like a buzzing sound? is so then it would be coming from your speakers. and would possibly mean a new sound board is in order. another possibility is that their is a hum from the power supply unit. but that's the power control board on the tv. this can also cause audible humming. if it sounds like a high voltage hum from a 60 hertz cycle then it is the power modal on the board failing more then likely.
good luck with it. and get a second opinion as i can easily be wrong. thanks for using fixya
By chance have you tried making sure the laptop is not too close to the speakers? Sometime you will get feedback when the source is to close to high powered speakers. Also, check your jack cord and make sure no splits/cuts are visiable and the plugs are fully inserted.
The noise from the TV is called 60 cycle hum and it is caused by a capacitor that is open, a test for ripple voltage will confirm this The noise from the VCR is more then likely common mode noise which would not be heard but for the bad capacitors in the TV. Simply put the common mode noise is being added to the 60 cycle hum. Now for how to fix this, if you have a background in electronics you can use a schematic, multimeter and an oscilloscope and Multimeter to find the bad capacitors, and the schematic to tell you what the voltages and %ripple should be. If you do not have a background in electronics, take the set to be repaired