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Old 12th June 2004, 06:06 PM   #1
hbarki is offline hbarki  Indonesia
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Default Zen V4 power supply question

Hello,

I almost finished building my Zen V4. I have a hard time understanding the Unregulated Power Supply schematics on page 5. My questions are:

1. If I run dual-mono (1 transformer per channel), do I still need 2 bridge rectifiers per channel? or, can I get rid of the bridge rectifier that's connected to "other ch"?

2. If I only need one bridge rectifier per channel, can I connect the ground leads from the electrical outlet to the chassis?

Thanks for the help!
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Old 12th June 2004, 08:28 PM   #2
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The second bridge rectifier is used as a ground loop breaker and the amplifier will work without it by by connecting the power supply ground to the chassis and earth ground to the chassis but don't go crying about hum when you connect it to your preamp.

You do not need two bridge rectifiers per channel. Your hookup should look like this:

Click the image to open in full size.
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Old 12th June 2004, 08:54 PM   #3
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Quote:
Originally posted by kilowattski
The second bridge rectifier is used as a ground loop breaker and the amplifier will work without it by by connecting the power supply ground to the chassis and earth ground to the chassis but don't go crying about hum when you connect it to your preamp.

You do not need two bridge rectifiers per channel. Your hookup should look like this:

Click the image to open in full size.
I think the connection of the capacitors to ground is not right. With the ground connections as shown the third bridge rectifier is bypassed.

George
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Old 12th June 2004, 09:03 PM   #4
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George,

If know the image is not the best but look closer at the ground symbols. One ground symbol is for chassis or earth ground and the other symbol (connected to the capacitors) is for analog ground. The drawing is schematically correct.
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Old 12th June 2004, 09:56 PM   #5
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Here is a better image, drawn a bit differently.

Click the image to open in full size.
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Old 13th June 2004, 02:29 AM   #6
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Quote:
Originally posted by Panelhead
I think the connection of the capacitors to ground is not right. With the ground connections as shown the third bridge rectifier is bypassed
Quite right. There are three grounds shown, and two look
the same, the left and right channel grounds. They are not the
same, but connect on either side of the diode bridge and of
course at the preamp.
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Old 13th June 2004, 03:32 AM   #7
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Nelson,

I took a second look and you and George are absolutely right. The two analog or power supply grounds shouled be separate. I will correct this and repost the schematic. Thanks George and Nelson for pointing this out.

Click the image to open in full size.
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