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Old 19th January 2013, 02:01 PM   #1151
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For grounding less is more
as using to many cables introduce a loop as cables lengths and resistances different this will cause a small difference in voltages that can be amplified
so one cable to one common point is the solution.
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Old 19th January 2013, 02:14 PM   #1152
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Add turntable and pre amplifier

For the turn Table this is normally double insulated same as to say it does not have a ground on the mains plug
so the screen wire for the arm is connected to the grounding lug on the chassis
This make a really convenient place where to connect the ground cables from the phono boards
Attached Files
File Type: pdf Buss of stars0001.PDF (7.0 KB, 43 views)
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Old 19th January 2013, 02:26 PM   #1153
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Same cartridges use the left cold wire as ground as well but this is as far as I know for MM cart so no problems
And is your TT got a ground cable on the mains plug you don't need the connection to the ground lug (main rule for avoiding ground loops is use only one cable to each point)

So use insulated plugs or if those are not get your snips and cut the screen cable as the metal enclosure will became your wire.
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Old 19th January 2013, 02:33 PM   #1154
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Lets see what happens with normal cables when you connect Paradise to pre amplifier.

You get 2 relay nice and juicy ground loops

As normal cables have a signal wire (hot) and a screen connected to both plugs

so again snip snip the screen at the pre amplifier end as this is connected to the mains with the ground cable on the plug

Do not disconnect the mains earth cable on the plug as this is there for your own safety

One can go further and squiggle the amplifiers on the drawings but I think I bored you already so ....
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File Type: pdf Buss of stars0002.PDF (9.6 KB, 38 views)
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Old 19th January 2013, 03:06 PM   #1155
FdW is offline FdW  Netherlands
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Location: Both feet on the ground (near Gouda)
Quote:
Originally Posted by Bksabath View Post
Here is Sketch of bus of stars
this is if you use 2 box set up
the input and output cables sockets must be isolated from the enclosure as those are grounded on the PCB

This means that 4 wires came from cartridge and all 4 are isolated from the ground
Mains ground to star/chassis-ground connection needs to be decoupled (DDCR) otherwise the mains-ground in the player connected to the player chassis will form a ground-loop via the common-wire that connects RIAA-signal-ground with player-signal-ground. If needed (preferred it is) a separate signal-ground and chassis-ground should also be created in the player, and then you will have the proposed 6-wire RIAA to player connection.
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Old 19th January 2013, 04:23 PM   #1156
miepa is offline miepa  Austria
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the bill of materials says
POWER RESISTOR 3W
for R27, R29 R104, R204
does this mean MOX Resistors or what is exactly meant by Power Resistor?

thanks.
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Old 19th January 2013, 04:29 PM   #1157
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by miepa View Post
the bill of materials says
POWER RESISTOR 3W
for R27, R29 R104, R204
does this mean MOX Resistors or what is exactly meant by Power Resistor?

thanks.
A resistor with a fixed value capable of dissipating 3 watts.

Any of these Resistors | Mouser (I do prefere metal film )
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Old 19th January 2013, 04:42 PM   #1158
miepa is offline miepa  Austria
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Old 19th January 2013, 05:46 PM   #1159
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Quote:
Originally Posted by FdW View Post
Mains ground to star/chassis-ground connection needs to be decoupled (DDCR) otherwise the mains-ground in the player connected to the player chassis will form a ground-loop via the common-wire that connects RIAA-signal-ground with player-signal-ground. If needed (preferred it is) a separate signal-ground and chassis-ground should also be created in the player, and then you will have the proposed 6-wire RIAA to player connection.
Correct if you have a player with a chassis
Mine and most budgets are double insulated (mains plug has only live and neutral conductors) as mentioned and body is made of MDF
So I only need to ground the arm
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Old 19th January 2013, 05:52 PM   #1160
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Bksabath View Post
Correct if you have a player with a chassis
Mine and most budgets are double insulated (mains plug has only live and neutral conductors) as mentioned and body is made of MDF
So I only need to ground the arm
And you are totaly correct In this case, go to a 5 wire connection.
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