Hey all
I’m modifying a Marantz CD63. It has 2 clock boards in it (Flea boards) both fed from a single additional power supply, connected to the DAC and servo chip.
The clocks have ground connections at the crystal end and the power input end. When I just had the one clock, one end’s ground was connected at the new power supply and the other end connected to the board just next to the DAC.
Now I’ve added a second clock I’m a bit confused as to how I should connect the grounds. If I connect this new one in the same way as the DAC clock then I think I’ve created a ground loop?
If I was to connect two clock boards, one feeding the servo and the other the DAC and decoder, both fed from the same external power supply, can anyone help as to where all the grounds should be going?? Obviously one from the clock board from the DAC but the rest I can’t get my head around.
TIA 😀
I’m modifying a Marantz CD63. It has 2 clock boards in it (Flea boards) both fed from a single additional power supply, connected to the DAC and servo chip.
The clocks have ground connections at the crystal end and the power input end. When I just had the one clock, one end’s ground was connected at the new power supply and the other end connected to the board just next to the DAC.
Now I’ve added a second clock I’m a bit confused as to how I should connect the grounds. If I connect this new one in the same way as the DAC clock then I think I’ve created a ground loop?
If I was to connect two clock boards, one feeding the servo and the other the DAC and decoder, both fed from the same external power supply, can anyone help as to where all the grounds should be going?? Obviously one from the clock board from the DAC but the rest I can’t get my head around.
TIA 😀
I decided to connect the DAC clock at both the new supply end and the board end, and the servo just at the board end for now, to avoid any ground loops.
For anyone else wondering I’ve been advised the best way of doing this to ensure everything has a proper ground is a separate new transformer per clock - so that’s the next job once the bits arrive to build a 2nd one.
For anyone else wondering I’ve been advised the best way of doing this to ensure everything has a proper ground is a separate new transformer per clock - so that’s the next job once the bits arrive to build a 2nd one.
Yes, but then the clock output signal has a ground and a +. Inside clock, is power ground and signal ground the same? So maybe they will be grounded togheter anyways!?
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This is true but the issue I was having was with a ground loop (player worked fine but not optimal) - with 2 separate transformers, the clocks are grounded at different points on the board and at their transformers but there’s no loop.
The clocks are grounded at the original clock ground points on the board so I don’t think the returns should be interfering with each other.
Just been advised not to do this as due to the only return path being through the DAC clock back to the power supply. Seems like the only decent way of doing it is to use 2 separate supplies - or use a divider if you need 2 different clock speeds and want to save some hassle.