I'm design a PCB with a Mic Pre, a 3 band EQ, Balanced I/O, Headphones out, LED Vu meter and USB DAC/ADC
As the op amp uses +ve and -ve. Should I use a design a 4 Layer PCB with
- signal plane
-2 Different power planes for +ve and -ve
- GND plane
OR use a 2 Layer PCB design and just route power using traces.
(FYI my design uses - 3 NE5532 IC
- 2 TL 072
- 2 LED Led controller IC
- 1Usb DAC IC )
As the op amp uses +ve and -ve. Should I use a design a 4 Layer PCB with
- signal plane
-2 Different power planes for +ve and -ve
- GND plane
OR use a 2 Layer PCB design and just route power using traces.
(FYI my design uses - 3 NE5532 IC
- 2 TL 072
- 2 LED Led controller IC
- 1Usb DAC IC )
Your first post, so first of all: Welcome!
A few questions:
Do you only have two supply rails for all your circuitry?
How much time are you willing to invest for PCB design?
One-off DIY project or high volume?
With four layers, you likely have better signal integrity and easier PCB design, but higher cost.
The op-amp power supplies could be routed from amp to amp - better keep them close together. The analog part may be fine with two layers only.
Not so sure about the DAC you are using and the complexity and constraints associated.
In any case, make sure to not put the digital circuitry on the same branch the analog circuitry is connected to. This should have its own branch and meet the analog branch at a star point at the power supply.
Do you have a placement already?
A few questions:
Do you only have two supply rails for all your circuitry?
How much time are you willing to invest for PCB design?
One-off DIY project or high volume?
With four layers, you likely have better signal integrity and easier PCB design, but higher cost.
The op-amp power supplies could be routed from amp to amp - better keep them close together. The analog part may be fine with two layers only.
Not so sure about the DAC you are using and the complexity and constraints associated.
In any case, make sure to not put the digital circuitry on the same branch the analog circuitry is connected to. This should have its own branch and meet the analog branch at a star point at the power supply.
Do you have a placement already?
Thank you.
Yes I only have 2 supply rails +15 and -15 for the pre amp.
This will also provide power to led VU meter. I am planning to make 7- 10 of these units that will act as a mixing deck and a master channel that will have the DAC(PCM2704) that will connect to a pc.
So the digital part will be in a different board all together.
I am planning to keep the PCB in a very small form factor.
I have not yet started the PCB design but I have designed the full schematics for this project.
Yes I only have 2 supply rails +15 and -15 for the pre amp.
This will also provide power to led VU meter. I am planning to make 7- 10 of these units that will act as a mixing deck and a master channel that will have the DAC(PCM2704) that will connect to a pc.
So the digital part will be in a different board all together.
I am planning to keep the PCB in a very small form factor.
I have not yet started the PCB design but I have designed the full schematics for this project.
Ah, so you are designing two separate PCBs.
I would say that you can save some money on the analog PCBs by designing a two layer PCB.
Take care that the VU meter does not mess up the analog ground or supplies. Not sure how the VU meter would look like and whether this is a potential issue.
Even the digital PCB could be using two layers only. This DAC is not that complex anyway.
You will likely need rather unusual trace width for correct impedance of the USB signals due to the board thickness.
I've seen a commercial DAC on a two layer board that is way more complex.
I would say that you can save some money on the analog PCBs by designing a two layer PCB.
Take care that the VU meter does not mess up the analog ground or supplies. Not sure how the VU meter would look like and whether this is a potential issue.
Even the digital PCB could be using two layers only. This DAC is not that complex anyway.
You will likely need rather unusual trace width for correct impedance of the USB signals due to the board thickness.
I've seen a commercial DAC on a two layer board that is way more complex.