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Old 18th May 2004, 12:05 PM   #51
Electrons are yellow and more is better!
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Is it soft 50 Hz hum or hard 100 Hz with harmonics?

100 Hz, which I'll guess you have => how have you connected the center tap, smoothing caps, speaker ground, signal ground?


Think like this:

signal ground
speaker ground
caps ground
transformer ground (center tap)

This is the order you must connect the ground in.


The thing which causes the hum is charging currents in the smoothing caps. A couple of milliohms and 1 A in the charging peaks (just an example) => millivolts in hum!

Can you take a photo or do a simple sketch?
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Old 18th May 2004, 12:16 PM   #52
Nuuk is offline Nuuk  United Kingdom
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Quote:
Actually my torroid is 500VA, 2X 25V, 220V Nuvotem Talema one. The circuit was for Peter Danial's circuit, the rectifier bridge used MUR860. Did checked the circuit a few times and seemed to be dandy, plugged into the powerline and the smoothing caps (polarised BG 4.7uF) fried. Is my VA rating way too high? I am really lost friend. Please help....
Tops, you seem to be confused if you are using 4.7's for smoothing caps!

Please post your complete circuit (including PSU) for us to have a look at and see if we can help you!.
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Old 18th May 2004, 12:28 PM   #53
Electrons are yellow and more is better!
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tops, if 4.7 uF is the only capacitance, you have a small problem! 1000 uF at least!

tops, your sig "Less is more", but sometimes more is more.....
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Old 18th May 2004, 03:06 PM   #54
Herman is offline Herman  Germany
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Default GC Pwr supply

Hello P-A,
thanks for the quick response.
I attach a picture of the (2 channel) setup. I use a star ground. The big filter caps are removed at the moment and therefore not in the picture.

Herman
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Old 18th May 2004, 03:07 PM   #55
Herman is offline Herman  Germany
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Sorry, forgot to attach the picture...
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