Let me start this thread as I was latest victim of this. I got confirmed after reading this.
In stereo setup I used to find my 200VA toroidal transformer which used to vibrate intermittently. I thought there is some problem with transformer. But used to happen sometime only. Irrespective of amplifier which is powered with this, at lowest or highest volume. It was in an DIY MOSFET amplifier.
I have 3 phase connection in house, so I moved that amp to living room. There vibrations are not present. Back to bedroom room its back. I noticed whenever our water pump starts this also starts vibrating.
According to that suggestion, I added that 50A bridge and 2 X 4700uF, 100V caps in series of toroidal mains supply. I measured DC offset across diode bridge, it was ~ 230-246mV.
See pics.
After doing the modification I found that toroidal transformer just went silent. There was very tiny hum in output. That too vanished. I find clarity increased. Now its not getting as hot as it used to be earlier.
Does anybody experienced same? Now I am more inclined towards R-Core transformers in future or add this mod to all vibrating toroidal transformers.
In stereo setup I used to find my 200VA toroidal transformer which used to vibrate intermittently. I thought there is some problem with transformer. But used to happen sometime only. Irrespective of amplifier which is powered with this, at lowest or highest volume. It was in an DIY MOSFET amplifier.
I have 3 phase connection in house, so I moved that amp to living room. There vibrations are not present. Back to bedroom room its back. I noticed whenever our water pump starts this also starts vibrating.
According to that suggestion, I added that 50A bridge and 2 X 4700uF, 100V caps in series of toroidal mains supply. I measured DC offset across diode bridge, it was ~ 230-246mV.
See pics.
After doing the modification I found that toroidal transformer just went silent. There was very tiny hum in output. That too vanished. I find clarity increased. Now its not getting as hot as it used to be earlier.
Does anybody experienced same? Now I am more inclined towards R-Core transformers in future or add this mod to all vibrating toroidal transformers.
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