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Old 22nd January 2006, 01:40 PM   #1
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Question DC power source connectio problem

Dear Friends,javascript:smilie('')
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Some interesting questions about my power AMP DC supply. You can find the schematic here with label “A” to “H”. I refer to this image exactly what I done. However, there would my concerning is how the load connect to which point from label “A” to “H”. Several kinds of connection I can do and will not happen serious fault and no harm.

1) Point “D” & “F” to load 1, “E” & “F” to load 2.
2) Point “D” & “B” to load 1, “E” & “B” to load 2.
3) Point “G” & “B” to load 1, “H” & “B” to load 2.
4) Point “G” & “F” to load 1, “H” & “F” to load 2.

Is all above connections have a same result respect AC ripple ?

Which case is best optimized with AC ripple control ?

Which one is best point for the main DC GND ( A or B or C or F) ?

Please help me to find the best connection points for label 1, 2 and 3.

CK
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Old 22nd January 2006, 03:03 PM   #2
MikeB is offline MikeB  Germany
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I would say option #1, then with the gnd of course at "F".

Mike
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Old 23rd January 2006, 12:19 AM   #3
Eva is offline Eva  Spain
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The bridge of the negative rail has a diode drawn backwards.
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Old 23rd January 2006, 03:55 PM   #4
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Hi Eva,

May I didn't show clear for you. This is single transformer with two separated secondary same output . So I ensure that this connection would not bring any problem, also I have tried in past.

I am still fuzzy on the GND connection. The wires +, - , GND are in straight line connected with parallel CAPs, although I pick any points along the wire should be the same....

Not sure who can tell me inside the facts ???

Thanks to Mike & Eva.

CK
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Old 23rd January 2006, 04:55 PM   #5
MikeB is offline MikeB  Germany
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I marked the reversed diode, it's likely to be a fault only on the drawing, otherwise you would have a nice short until the diodes blow, then you would have a halfwave rectifier left.

"although I pick any points along the wire should be the same...."

No, it's not ! It is very important to realize that wires have a resistance, this resistance create a voltage caused by the currents flowing. The resistance is only milliohms, but 10ampere through a wire with 1 milliohm already cause 10mv.
These resistances can be very annoying when creating a PCB-layout, a few millimeters of the wrong ground trace can cause audible hum...

Mike
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Old 24th January 2006, 01:36 AM   #6
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Hello Mike,

Thanks again for your detail checking, also I have not found the diode reversed. Of course, I never do this connection. It was my drawing mistake.

Seems your decision making is depending on the resistance of the wire. So these three DC wires must keep the same length when used on DC supply. Hence, the connection point as you said every capacitor to bear a bit resistance value and which will accumulate to maximum R at end of source. At last every resistor will have power dissipation then balance the whole system.

CK
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