Dual Section Capacitor - Page 2

DF96 · 30th September 2012, 08:30 PM

Dual or triple (or more) capacitors were common in the valve era. Often the negative connection was the can, which was clamped to the chassis. You just connected all grounds to the nearest point on the chassis and let the currents find their own way. This was good enough for radios and amplifiers, as a little hum was regarded as normal back then.

woodrough · 30th September 2012, 08:50 PM

oh interesting! That makes some sense chronologically.
So without a doubt, being that I am interested in reducing hum as much as I can, it is wiser to separate the capacitor grounds to their individual grounds as much as possible.

I had some rough understandings with dual (or more) capacitors, but couldn't find any good literature on the subject.

AndrewT · 1st October 2012, 09:01 AM

I can see post9 pics.
Do they need to be 1920pixels wide?

AndrewT · 1st October 2012, 09:04 AM

There is nothing wrong with separate grounding of the -ve of each of the PSU capacitors.
That is exactly the same as separate the PSU Zero Volts from the Main Audio Ground.

woodrough · 1st October 2012, 11:21 AM

Andrew, your thought made me think about ground loops and how two psu's caps independant ripple variations will be so minor it shouldn't really matter at all if they are linked at ground out of the can vs at the star ground.
The bad ground loop scenario would be one with cathodes and other components at the bottom of each stage.

Are my thoughts on ground loops and star grounds somewhat right?

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30th September 2012, 08:30 PM	#11
DF96 diyAudio Member Join Date: May 2007	Dual or triple (or more) capacitors were common in the valve era. Often the negative connection was the can, which was clamped to the chassis. You just connected all grounds to the nearest point on the chassis and let the currents find their own way. This was good enough for radios and amplifiers, as a little hum was regarded as normal back then.

30th September 2012, 08:50 PM	#12
woodrough diyAudio Member Join Date: Aug 2012	oh interesting! That makes some sense chronologically. So without a doubt, being that I am interested in reducing hum as much as I can, it is wiser to separate the capacitor grounds to their individual grounds as much as possible. I had some rough understandings with dual (or more) capacitors, but couldn't find any good literature on the subject.

1st October 2012, 09:01 AM	#13
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I can see post9 pics. Do they need to be 1920pixels wide?

1st October 2012, 09:04 AM	#14
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	There is nothing wrong with separate grounding of the -ve of each of the PSU capacitors. That is exactly the same as separate the PSU Zero Volts from the Main Audio Ground.

1st October 2012, 11:21 AM	#15
woodrough diyAudio Member Join Date: Aug 2012	Andrew, your thought made me think about ground loops and how two psu's caps independant ripple variations will be so minor it shouldn't really matter at all if they are linked at ground out of the can vs at the star ground. The bad ground loop scenario would be one with cathodes and other components at the bottom of each stage. Are my thoughts on ground loops and star grounds somewhat right?