Zap Pulse 700XE received today

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#241
Lars Clausen said:
Aaaaaaaaaa ok, you are talking about LC audio, ok, well then i would have to agree with you. But i have nothing to do with them anymore, except i worked there 8 months ago.
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Hi Lars
That's amazing. I can't believe that its been 8 months, since you left LCaudio :cannotbe: Well life certainly does go by, and, then there's another day :bigeyes:
All the best to you from down under 😎
:cheers:
 
#242
I got a technical question regarding the earth connections of Zap pulse SE and 700XE. Anyone interested may take a look at www.lcaudio.dk/zpactionpackwiring.pdf.
I have learned never to earth the psu (the middle of the capacitors) straighto to the chassie but as far away as possible,preferably earthing to the chassie at the input contacts.Here the psu is earthed to the the middle of the chassie and also from there is a wire connected to and parallelling the inputs ground.Iappears to me as that could cause ground loops.
On the pcb there is a resistor at 2.2 ohms separating input ground from output ground and that resistor will be shorted if following the directions of the groundin scheme.
That's as it appears to me....guess I'm wrong but please convince me 😀
:violin:
 
#244
Anzgar: Sorry i am not at liberty to offer you the support you need for LC Audio's product or documentation, but i am sure Lars Nielsen will do that soon.

Furthermore i am working on my own projects now, with a brand new technology. So it would be wrong of me to interfere with other people's stuff. 🙂

All the best from

Lars
 
#245
Anzgar said:
I got a technical question regarding the earth connections of Zap pulse SE and 700XE. Anyone interested may take a look at www.lcaudio.dk/zpactionpackwiring.pdf.
I have learned never to earth the psu (the middle of the capacitors) straighto to the chassie but as far away as possible,preferably earthing to the chassie at the input contacts.Here the psu is earthed to the the middle of the chassie and also from there is a wire connected to and parallelling the inputs ground.Iappears to me as that could cause ground loops.
On the pcb there is a resistor at 2.2 ohms separating input ground from output ground and that resistor will be shorted if following the directions of the groundin scheme.
That's as it appears to me....guess I'm wrong but please convince me 😀
:violin:
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Hello All!! - Espec. kurt..:

The link you are referring to is aparently not present right now, but i believe it is page two 0f this..:

http://www.lcaudio.dk/zp2iv.pdf

If problems ( Hummm ) occur, please wire gnd. as follows..:
Connect both modules input GND to eachother by as short wire as possible
Connect herefrom, to the center of the power capacitors ( Power Gnd )
Connect herefrom ( Power Gnd ) to chassis via a 2.2 / 2W resistors
Connect Center pin of 220V filter to chassis.
Experiment with earth connected all places / some places / not at all
Twist Speaker cables pairwise to minimize RF radiation
Twist input cables pairwise to minimize RF sensitivity
Keep input cables as far away from output cables as possible
Keep all cables as F****** short as possible!!!

I might later post a picture of an nicely trimmed amp...

As a lot of other things in life, there is no sincere rules about ground and earth connection regarding incomming noise, but i'll try to explain my experinences' with the above..:

When the input ground is isolated from power ground via a 2.2 Ohms resistor on the pulse board, it is possible to direct incomming gnd noise to amplifier gnd. outside the sensitive preamp stage in the modules, instead of through the gnd signal path of the input stage. - Not easy for me to explain in english...

Chassis connection..: To shield form incomming / outgoing noise. But via a 2.2 Ohms or so in order to separate it from the signal path.

Chassis / Earth..: Mains filters make 110V on the centre pin, when not connected to earth. If connected to Chassis --> power gnd via 2.2 Ohm., then the "psychic level" of the chassis is levelled to the power ground, thus removing possibility of thwe 50hz making airborne transformation into the audio circuitry.

The connection of the Centre Pin to chassis can be experimented to which gives the better result, as it depends a lot upon the connected periferals, and whether the earth is connected to the filter. But be aware, that most mains filters in metal automaticly connects center pin to chassis when mounted, unles mounted in a plastic or rubber surround, or so...

Sincerely, Lars / Viborg - Tech Support for LC Audio
 
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