How to remove the buzz from the power amplifier

It is normal for the assembled ampifier to make a buzzing sound when it is turned on. This is normal, but that doesn't mean it doesn't need to be addressed; because of course it does not make us comfortable as people who assemble it. Dealing with an assembled ampifier buzzing “hummm” can be tricky at times, as this can involve several factors including grounding and voltage stability. Grounding itself includes a matter of wiring and circuit layout of components that emit induction such as transformers and coils. Well, to overcome this, then you need to make sure everything is laid out properly and correctly.
Content table
Causes and How to solve the assembled amplifier buzzing Grounding Unstable voltage and less cleanOthers
Causes and How to solve a buzzing assembled amplifier
Before talking about "how to fix", of course we need to know what things can make our amps emit a hummm or hum sound.
How to Assemble Multiple Elcos for Power Supply Power Amplifier
Many questions are circulating about Elco for power supply for power amplifiers, especially medium watts…
Grounding
Good grounding can reduce or dampen stray frequencies that can enter and affect the sound signal so that it becomes dirty and audible in the speakers and eventually causes buzzing. Pre-amp is a signal amplification circuit, which is generally applied to tone control devices in order to get sufficient amplification. Well, the sensitive input of this pre-amp is prone to include wild frequencies that are around it, including sometimes being able to emit radio sound. So, so that these stray frequencies can be muffled and prevented, the ground amp must be good, here's how:
Arrange the cables in such a way that they look neat. Don't be too long, and try not to use a cable for the potentiometer (attached to the PCB), but if you can't, try to be as short as possible and use a good pre-amp/skerem cable. grounded - this is especially true if you are using a non-metallic box. And if you use a metal box, then the box body must be connected to ground or 0 voltage from the power supply. Try if you can use a metal box ampifier, because the frequency of interference from outside such as radio frequencies will not be able to penetrate the metal box that is grounded.
voltage that is less stable and less clean
Unstable voltage is a voltage that is not steady, aka changing like a wave. This greatly affects the sound quality of your sound system, including causing a buzzing sound. The uneven DC voltage also greatly affects the sound quality. For that, here's how to solve it: Use elco as a voltage filter that matches the voltage from the power supply used. For example, if you use a 12 volt stun, then the Elco has a voltage capacity of at least 16 volts. Less than that can cause hum. On the power supply, use a good rectifier for example using the Kiprox model.
Another cause that can generally cause hum is the transformer. A transformer made of poor quality can cause hum, for example loose and less dense windings, or leakage of primary voltage to secondary. Although this leakage is very small, it is enough to create a loud hum in the loudspeaker. Also, keep the transformer away from pre-amp circuits such as tone control, equalizer, mic amplifier, and power amp. If the circuit is separate between power and tone control or other circuits such as bass reinforcement etc., then try to be as close as possible and as short as possible using the cable. If necessary, combine it into one ground. The transformer, at least use 2 amperes for tone control, so that the voltage is stronger and easily stabilized so that it does not have the potential to cause a buzzing sound. If necessary, the voltage is included with the power voltage (assuming the power voltage is not too large). But usually the OCL 150 watt power amp uses a minimum voltage of 20v, while the tone control uses a voltage of 12 volts? Just use IC 7812 series for voltage + and 7912 for voltage -. Keep cables or audio circuits / circuits away from transformers, because transformer induction will cause hum. If you need a pre-amp circuit such as Tone control, a special box is made for the microphone, which is separate from the power amp, which certainly uses a large transformer of 10 amperes and above.
Those are the main causes of buzzing in assembled amps and how to overcome them. But remember, hum is not noise so it can't be silenced using an anti-noise circuit. Noise itself is a side effect of high frequency audio amplification, while hum is a sound defect / interference. Meanwhile, if buzzing occurs in the power amp (when the tone control is released), it is most likely the result of a defect that can be caused by an under or excessive bias voltage, as well as a transistor / diode in the power amp that is incorrect / half short.

[@zaxi0]

Just casually soldering while plugged in

[@MujikoProject]

yes, it assembles the power amplifier

[@Smelter57]

In the UK we have 3 pin dedicated LNE mains so your 1st solution would require a transformer rewire. I have a 4 band eq bass amp that has noise on just one of the band's, so I'll try out your 2nd solution. Thanks for the tip.

[@chinhchinh6265]

None worked. Still buzz, huming

[@zakirshaik925]

Hello bro.. I have a philips 8000B 5.1 home theater . Giving humming sound in standby mode . .humming is only in right rear speaker

[@MujikoProject]

try to check the cable and speaker socket

[@jazzyed3509]

Brother actually I have 5.1 channel system but my speakers make buzz when they are in standby mode.
What should I do?

[@rabarebra]

Buy new ones.

[@aroratraders3181]

​@@rabarebra😂😂😂😂

[@rabarebra]

It is most probably just a $1 capacitor in the power area that is blown. These faults makes a tiny buzz coming out from your tweeter.

[@zakirshaik925]

Please give me some idea

[@MujikoProject]

what's wrong with your amplifier?

[@yukkireina]

Huh man, i was afraid your capasitor will be blow up after seen that center connection is disconnected from the transformer

[@romeoj387]

I hear the buzzing also from your microphone you use😅