Your X-reg is a regulator like many other. If you have a look at the schematic from RJM, his version has caps at the output (C6 on his schematic).
It's a lot easier to control the currents and the sense points (where r6 connect in your schematic) if you're using tracks rather than planes for your regulators. That's how most super-regs are layed out, for a reason.
It's a lot easier to control the currents and the sense points (where r6 connect in your schematic) if you're using tracks rather than planes for your regulators. That's how most super-regs are layed out, for a reason.
i was under the impression that C6 were smoothing caps. if you have a look at the x-reg board layout in Eagle you will see the RJM uses 1 ground plane for everything on his x-reg demo boards, this includes input from the rectification and output to device. the top layer is split into 4. V++/V-- for input and V+/V- for output after transistors.
Bibio, why do you not use COM and COM1 in your layout? Does the x-reg ground plane look like yours? Where is the 0V point in the circuit? How does it work?
COM-COM1 in my layout?
i think it might be possible that people are not seeing the DIP rectifiers on my board, the DIP rectifiers are creating the split supply for the X-Reg circuit.
the X-Reg board that i posted above is a stand alone supply and does not show the rectification. with regards to the rectification it makes no difference if i join the COM at the rectifiers or at the board the X-Reg board that i posted above has them tied at the rectifiers and a single COM lead to the board, it could just as well have two input COM through holes on the board instead of the one. the above creates the 0V.
the output COM on the X-Reg board above is where you would connect a device GND.
now lets look at my board. all i have done is incorporate the X-Reg and the rectification onto my board. there was no room for me to create the X-Reg COM/GND (same thing) on my main COM/GND plane due to the exit point being blocked by caps of the audio section so i decided to create the X-Reg COM/GND on the top Layer 1 and use a through hole as the tie in point to connect it to the main audio section COM/GND plane on layer 2. layer 2 has restriction around all the pins of the devices for the X-Reg to keep them separate. this in my view is just like having the X-Reg off board.
layer 3 on my board is V- plane
layer 4 on my board is V+ plane
i might look into splitting layers 3-4 for V++ and V-- as well just like the X-Reg that Richard designed as at the moment they are traces.
i think it might be possible that people are not seeing the DIP rectifiers on my board, the DIP rectifiers are creating the split supply for the X-Reg circuit.
the X-Reg board that i posted above is a stand alone supply and does not show the rectification. with regards to the rectification it makes no difference if i join the COM at the rectifiers or at the board the X-Reg board that i posted above has them tied at the rectifiers and a single COM lead to the board, it could just as well have two input COM through holes on the board instead of the one. the above creates the 0V.
the output COM on the X-Reg board above is where you would connect a device GND.
now lets look at my board. all i have done is incorporate the X-Reg and the rectification onto my board. there was no room for me to create the X-Reg COM/GND (same thing) on my main COM/GND plane due to the exit point being blocked by caps of the audio section so i decided to create the X-Reg COM/GND on the top Layer 1 and use a through hole as the tie in point to connect it to the main audio section COM/GND plane on layer 2. layer 2 has restriction around all the pins of the devices for the X-Reg to keep them separate. this in my view is just like having the X-Reg off board.
layer 3 on my board is V- plane
layer 4 on my board is V+ plane
i might look into splitting layers 3-4 for V++ and V-- as well just like the X-Reg that Richard designed as at the moment they are traces.
yes for the input rectification part of the circuit which is split on the top as regards to the type of voltage. Richard uses what he likes to call V++/V-- and V+/V-. all V++/V-- voltages are 'raw/unregulated' and all V+/V- voltages are 'smoothed/regulated' to which he creates separate planes for each one.
Perhaps connecting OPA-1 pin3 and pin6 to both ground planes could replace the output COM. This would then be the 0V point.
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could do, but there is a whole ground plane to work with. only reason i'm using the through holes is it will have a connector on it in case i need to connect to the case, dont think it will though and should be fine floating.
He calls that whatever he wants. It doesn't change the fact that it is a good idea to have caps at the output of your regulators (from the regulated output to gnd) to establish a low impedance output at all frequencies (and sink the return of the headphones). For now, this role is served by the decoupling caps.
Have a look at how the super-regulators in the diyaudio audio store have been drawn.
Really, there's no need for 4 layers. Post 94 was a good starting point, as the current loops were more clearly defined by the placement of the parts on the pcb.
A ground plane does not have a single voltage (0V). The voltage at COM is not the same as at COM1 or at any other location on the ground plane.
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