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Power supply ground
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Old 4th February 2018, 09:26 AM   #11
emosms is offline emosms  Bulgaria
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Some modification.

1. The multicontroller is isolated with optocouplers. Do we still need to connect the microcontroller ground (PSU1) to the other ground?

2. The spdif module gets +5v digital and ground from PSU2.

3. The DAC module gets:
- i2s data
- +5v digital and ground from the spdif module
- +5v analog and ground from PSU3
- +-15v bipolar and ground from PSU4

Here all the ground comes into common ground.
The problem is down to designing the DAC pcb.
All grounds on seporate poligons and a point of connection between them.
Possibly, option for ground potential elevation of any ground to any ground...

4. The analog input selector is ommited, since it is relays. Galvanically isolated.

5. The Xover module gets:
- audio signal from dac
- +-15v from dac
- common ground from dac

6. The vol control module gets:
- audio signals from Xover
- +-15v from Xover
- gnd from Xover
Moreover, it derives +5v (or whatever necessary) from the +15v, to feed the optocoupler and digital control.
Not very clean but... do we need a seporate PSU for this??
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Is that OK architecture? Most of the interesting stuff happens in the DAC pcb and topology.
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Old 4th February 2018, 01:05 PM   #12
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by emosms View Post
1. The multicontroller is isolated with optocouplers. Do we still need to connect the microcontroller ground (PSU1) to the other ground?
No, but do you need separate PSUs for the different digital circuits? And why not have one supply for all the analogue circuits, derive the +5V from the +/-15V?
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