Single capacitor for both rails.

Alexontherocks · 7th October 2011, 04:14 PM

Hopefully someone can shed light on a questions which as been bugging me since starting my last build...

Let us say I intend to use 2x 45v rails. I have a board which has 4x 80v capacitors wired in series (so theoretically good for a total voltage differential of 160v)...at the end of the path I originally intended to use 2 large 40,000uf caps in series rated 100vdc each.

Now the question I have is: Can the capcitors be wired in parallel thus effectively doubling the capacitance to 80000uf?

Is there any sonic/electrical disadvantage to having capacitors in parallel rather than in series?

Thanks
Alex

Andrew Eckhardt · 04:22 PM

In a single supply full bridge amp yes, in a half bridge no. In the half bridge supply the caps are not really in series, but filter two separate supplies that alternately get loaded to common. You need two separate caps (banks).

Alexontherocks · 7th October 2011, 04:23 PM

I have a full wave rectifier board with a +/- 45v rails

Could you please elaborate as to why this cannot be done with a full wave amp?

Thanks!

Andrew Eckhardt · 7th October 2011, 04:28 PM

You can't confuse the power supply configuration with the amp configuration.

If your amplifier output returns to common/ground you need two filter capacitors, two handle changing currents in both supplies.

7th October 2011, 04:14 PM	#1
Alexontherocks diyAudio Member Join Date: Jul 2009	Single capacitor for both rails. Hopefully someone can shed light on a questions which as been bugging me since starting my last build... Let us say I intend to use 2x 45v rails. I have a board which has 4x 80v capacitors wired in series (so theoretically good for a total voltage differential of 160v)...at the end of the path I originally intended to use 2 large 40,000uf caps in series rated 100vdc each. Now the question I have is: Can the capcitors be wired in parallel thus effectively doubling the capacitance to 80000uf? Is there any sonic/electrical disadvantage to having capacitors in parallel rather than in series? Thanks Alex

7th October 2011, 04:19 PM	#2
Andrew Eckhardt diyAudio Member Join Date: Nov 2005 Location: PA	In a single supply full bridge amp yes, in a half bridge no. In the half bridge supply the caps are not really in series, but filter two separate supplies that alternately get loaded to common. You need two separate caps (banks). Last edited by Andrew Eckhardt; 7th October 2011 at 04:22 PM.

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7th October 2011, 04:23 PM	#3
Alexontherocks diyAudio Member Join Date: Jul 2009	I have a full wave rectifier board with a +/- 45v rails Could you please elaborate as to why this cannot be done with a full wave amp? Thanks!

7th October 2011, 04:28 PM	#4
Andrew Eckhardt diyAudio Member Join Date: Nov 2005 Location: PA	You can't confuse the power supply configuration with the amp configuration. If your amplifier output returns to common/ground you need two filter capacitors, two handle changing currents in both supplies.

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