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Old 13th November 2005, 09:37 PM   #1
kepa1 is offline kepa1  France
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Question Is it ok...

... If i connect four caps on a bridge rectifier and their pins have contact with each other?

Plus, I inserted and soldered the caps pins to the holes of the rectifier connectors, does it sound allright?

These are my newb questions!
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Old 13th November 2005, 10:45 PM   #2
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Hi Kepa1

It sounds ok, but could you post a pic or drawing so we can make sure for you?
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Old 13th November 2005, 10:54 PM   #3
Duo is offline Duo  Canada
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Sounds feasible.

You're thinking of connecting these four capacitors directly to the rectifier I take it?

Should be fine; but a picture helps us help you.
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Old 14th November 2005, 09:29 AM   #4
kepa1 is offline kepa1  France
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Thanx guys, the photo is on its way for tonight!
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Old 14th November 2005, 05:54 PM   #5
kepa1 is offline kepa1  France
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Back home, so here is the photo:

Click the image to open in full size.

You can see these four caps around the left bridge, each rectifier being bypassed and eventually all caps being connected to each other through the rectifier pins. I've seen it before on the net but it just feels curious because current should go from one cap to another, causing a short circuit or something similar, shouldn't it?

Now I feel more ashamed to ask this question...
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Old 14th November 2005, 06:04 PM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
Just to complete the picture you could add spike supression caps diagonally across the corners pins. i.e. across the AC input and across the DC output.
If you draw the schematic it is quite normal. It's just that everyone else is so used to using PCB and forgotten about hardwiring but without the wires.

Some are advocating the use of snubbers (series resistor & cap) across each of the diodes instead of just a cap. They claim it reduces the Hi. Freq. hash that would otherwise get sent to the smoothing caps and then only partially attenuated goes into the amplifier or other downstream client.
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Old 15th November 2005, 01:09 PM   #7
kepa1 is offline kepa1  France
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Thank you for the tips AndrewT, maybe there is room enough!

But does your answer mean that the set up on the photo is Ok...?
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Old 15th November 2005, 02:47 PM   #8
AndrewT is offline AndrewT  Scotland
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YES
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Old 16th November 2005, 09:57 AM   #9
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I agree!
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Old 16th November 2005, 07:10 PM   #10
kepa1 is offline kepa1  France
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Job done, thank you guys!

But it wasn't an easy one, the bridge pins don't like solder at all, I mean it's like rain drops on the window pane...

And hard wiring a potentiometer isn't funny either
I guess It's were PCB makes sense!
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