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Class D Switching Power Amplifiers and Power D/A conversion

UCD400 Power Supply mod?
UCD400 Power Supply mod?
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Old 16th June 2007, 12:30 PM   #1
ghisdal is offline ghisdal  Norway
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Join Date: Nov 2006
Default UCD400 Power Supply mod?


I am going to build 2 monoblocks using UCD400AD modules. I have ordered 2 pcs of the Hypex standard power supply.

I have 6 10000uF 80V Elna caps I wish to use. Is it hard to do this? Can I just add them in series to the print along with the others?

Please advise, I suck at electronics, but pretty handy with a soldering iron...
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Old 16th June 2007, 01:24 PM   #2
mazurek is offline mazurek  United States
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Join Date: Aug 2005
Placing the capacitors before the psu module doesn't make sense. Placing them after the psu will be overriding the fusing and the dc blocking shut off relay. At the very least, you would need to fuse again after the additional capacitor bank. You could also build your own psu, just copy the simple rectifier/cap arrangement shown in the UCD docs, of course then it won't have any dc protection.
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Old 16th June 2007, 02:12 PM   #3
ghisdal is offline ghisdal  Norway
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Join Date: Nov 2006
I mean if it is possible to take off the 2 normal caps in the psu and replace them with the three Elna's that i've got to increase the totalt amount of uF's?

If so, how would I connect them?
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Old 16th June 2007, 03:12 PM   #4
mazurek is offline mazurek  United States
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Join Date: Aug 2005
You could do that by desoldering the existing capacitors, and soldering in 16 gage wire where the terminals were. You would connect all the caps in parallel for each rail. You might also be able to find an electrically common place and drill it out to put in something like a faston.

Whether you should is another question that other people may be better qualified to answer....

Your other caps / layout may affect noise performance, current inrush, etc.

Maybe before you could setup the system sucessfully using the existing psu, verify that DC offset is not a problem in your setup. Then build your own psu on a breadboard with a rectifier bridge/schotky diodes and your elna caps, and some 1/4" fast-ons. In fact, you can visually inspect the hypex psu and copy their rectifier bypassed by small ceramic caps arrangement.
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Old 19th June 2007, 07:15 PM   #5
dmfraser is offline dmfraser  United States
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Join Date: Dec 2003
Location: Orange County, CA
Default Capacitor wiring

Just remember that you cannot add capacitors off on a branch and expect a worthwhile effect.

The power has to come from the source, go to the capacitors and then to the load. That is the source and load both connect to the capacitor terminals directly.

Both on the + and - capacitor leads..

If the capacitors are on a branch, you have the resistance of the wires effectively in series with the capacitors, reducing their effect quite a bit.
Dan Fraser
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