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Old 18th December 2008, 10:55 PM   #1
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Default Two rectifiers

I can't find it... can anyone help me, I need a diagram or explanation as to how to utilize both rectifier boards on my audiosector 3875 amp, off of my single dual-secondary toroid (non-centre tap).

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Old 19th December 2008, 08:14 AM   #2
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Hi,
It should be something like this below. Colours may be different with your transformer.
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Old 19th December 2008, 08:38 AM   #3
col is offline col  Australia
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This is how I usually do it:

http://sound.westhost.com/project04.htm

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Old 19th December 2008, 08:43 AM   #4
Dr.X is offline Dr.X  United Kingdom
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From what I have read over the last couple of weeks on this forum, I beilieve there is the potential for some hum problems with that 'paralleled' set-up and that you should ideally use one board per transformer (so two boards = two mains transformers, i.e. dual-mono).
Try Peter's specific thread... Gainclone Kit

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Old 19th December 2008, 09:57 AM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
project04 directly connects both Audio Grounds to Power Ground. This will give rise to excessive hum and buzz with multi-channel amplifiers with many setups/interconnects.

The dual rectifier gives the option to keep each channel's Audio Ground separate from all others. The down side is that a disconnecting network is required for every channel to take fault current back to Safety Earth.

Monoblock outperforms all others in my experience.
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Old 19th December 2008, 10:04 AM   #6
col is offline col  Australia
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Iv'e used the ESP project4 setup with several amps I have built using Hypex modules the audio GND doesn't go to power GND. It works fine and I have never experienced any hum.

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Old 19th December 2008, 10:14 AM   #7
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by col
Iv'e used the ESP project4 setup with several amps I have built ............................. the audio GND doesn't go to power GND.
could you define what "your" Audio GND is?
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Old 19th December 2008, 10:18 AM   #8
col is offline col  Australia
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I think you should pretty much be able to see all the connections here:

http://pix.minirig.org.au/main.php?g...geViewsIndex=1

I think my "audio GND" is the - terminal of the speaker :0

Is yours the GND of the amp module?

Haven't had any bad hums though.

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Old 19th December 2008, 10:29 AM   #9
AndrewT is offline AndrewT  Scotland
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it looks like the white wire is the centre tap to one PSU.
The black wire looks like a link from PSU1 PGnd to PSU2 Gnd.
The two Grn/Yel wires seem to connect the both PGnd1 & 2 to Safety Earth.

How do Signal GND and Speaker GND and PCB GND connect?
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Old 19th December 2008, 10:38 AM   #10
col is offline col  Australia
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Maybe because the Hypex amps have balanced inputs and the signal GND doesn't touch the case GND the project4 dual rectifier setup works?

http://pix.minirig.org.au/main.php?g...geViewsIndex=1

The black wires that are the centre tap are the module GND, this connects to the case GND/earth.


Quote:
How do Signal GND and Speaker GND and PCB GND connect?
I don't think they do, they seem all separate, unless it takes place inside the PCB.

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