It is a factory built unit and i have been noticing this buzz or hum, low level but I can hear it at my listening position. It is independent of the input and output connections. How can I determine if it is a buzz or a hum? Would damping the transformer do something? Thanks in advance.
It is coming directly from the power transformer checked with the case open small audible hum or buzz not transferred to the speakers
see this :
Papa’s Koan (M)2 , an amp for living room | Zen Mod Blog
all you need is longer screw and some rubbery foam or similar
even eraser gums ....... in fact , softer ones are perfect for task
Papa’s Koan (M)2 , an amp for living room | Zen Mod Blog
all you need is longer screw and some rubbery foam or similar
even eraser gums ....... in fact , softer ones are perfect for task
read that as rubber eraser ........
brainfart resulted from fact that rubber is "guma" on Serbian ....... and that I'm never aware in which language I'm actually typing
It was mentioned by several posts:
If there is a small DC level at the AC power line, it will be causing buzz in the power toroids.
I was experienced this also:
I always know, when my daughter is drying her hair at upstairs above me.
In the position-switch of dryer, there are some diodes.
These are cause a little DC offset (approx. 0.4VDC) if the dryer is operating, at some switch settings.
There are many other DC sources on AC power line.
Dimmers, electro motor rev. controllers and the God knows what else.
And this little DC level causing audible difference in buzzing, by saturating toroid core.
So perhaps you would check DC level of your mains supply line.
Be careful with it!
And may be not all of the DMM's capable accurate measuring it.
BTW you all of the time hear the same level of buzz?
If yes, and you not have DC on AC, this buzzing perhaps caused by loosened toroid coils.
Kind regards:
Gyuri
If there is a small DC level at the AC power line, it will be causing buzz in the power toroids.
I was experienced this also:
I always know, when my daughter is drying her hair at upstairs above me.
In the position-switch of dryer, there are some diodes.
These are cause a little DC offset (approx. 0.4VDC) if the dryer is operating, at some switch settings.
There are many other DC sources on AC power line.
Dimmers, electro motor rev. controllers and the God knows what else.
And this little DC level causing audible difference in buzzing, by saturating toroid core.
So perhaps you would check DC level of your mains supply line.
Be careful with it!
And may be not all of the DMM's capable accurate measuring it.
BTW you all of the time hear the same level of buzz?
If yes, and you not have DC on AC, this buzzing perhaps caused by loosened toroid coils.
Kind regards:
Gyuri
And I guess all of the transformers are buzzing at a certain level, even the significantly oversized, potted transformer is buzzing somehow.
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