When and where you can have a common ground? In this case between 2 different transformers. The initial goal is to have:
- One Ground
- -15 V
- +15 V
- +12 V
The split 15 volt supply will be used for driving a few op amps and the 12 volt supply will be used to drive some LEDs. I like to keep the supplies for light and audio separated to reduce noise and interference.
- Can the grounds be connected together?
- Will this design result in less noise?
- Or will the LEDs still cause interference because of the common ground.
Here is a diagram to show what I mean. I have kept it simple, so no smoothing caps: