Power Supply Design
The electrical circuit needs some voltages to work:
- +15V and -15V for op-amps
An off-the-shelf unit (MEAN WELL RT-65C) works just fine. (RT-50C should work, too)
5V for VU meter LEDs(didn't work out as planned)
- 48V for phantom power (if this feature is wanted/ needed)
The required amperage for the +15 and -15 V rails quite low (< 100 mA) for the audio circuitry + about 100 mA max for all the LEDs. I need to acutally measure it in the future.
Idea for 48 V phantom power: Use a boost converter to get 50 V or so from the +15 V rail of the off-the-shelf switching power supply. Then use a linear regulator to get a cleaner 48 V DC (e.g. like here: https://www.eeweb.com/48v-phantom-microphone-power-supply/ using a TL783 IC).
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