Two rectifiers

[raypalmer]

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).

Thanks

[audio1st]

Hi,
It should be something like this below. Colours may be different with your transformer.

[col]

This is how I usually do it:

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

col.

[Dr.X]

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

HTH.

[AndrewT]

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.

[col]

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.

col.

[AndrewT]

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?

[col]

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.

col.

[AndrewT]

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?

[col]

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.

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.

col.