Power Supply Design #5

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opened 2021-05-30 22:00:11 +00:00 by jannik · 1 comment

jannik commented

2021-05-30 22:00:11 +00:00

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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.

The electrical circuit needs some voltages to work: - [x] +15V and -15V for op-amps An off-the-shelf unit (MEAN WELL RT-65C) works just fine. (RT-50C should work, too) - [x] ~~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.

jannik added the

help wanted

requirement

labels 2021-05-30 22:00:11 +00:00

jannik commented

2022-09-17 19:03:09 +00:00

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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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