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Old 20th November 2012, 04:03 PM   #1
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Default Looking for 48V phantom power supply DIY

I gave up.
I tried to build 48V supply for mic.
I use 12V to run my device & I need to make 48V from 12V

Any solutions?
I didn't find any reasonable solution.

Idea to build generator with NE555 + trafo + 48V stabilizer is ok?
If You have any experience, please share.
thx
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Old 20th November 2012, 04:34 PM   #2
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Rod Elliot provides details of providing a phantom PSU for mics.

I would use a simple flyback circuit to produce 48V from 12V.
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Old 20th November 2012, 04:37 PM   #3
Minion is offline Minion  Canada
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12v AC can be turned into 48v DC using a voltage tripler ......

12v AC = 17v DC x 3 = 51v DC which you can regulate to 48vDC with a LM317

I have built a few mic preamps that used this method to get 48v Phantom ......

cheers
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Old 20th November 2012, 06:36 PM   #4
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I've got only 12V DC, not AC. That's the problem.

"simple flyback circuit" - which? MC34063 or LM2585?
I need details & working solution. Please.

It's quite simple thing but I can't find good solution.
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Old 20th November 2012, 06:48 PM   #5
WSJ is offline WSJ  United States
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The PB23 is for powering phantom powered microphones with 48VDC. Since the unit uses a 100KHz switching power supply there is no audio noise generated. It has an output pull down resistors so it will work with any mixer.

Rolls Corporation - Real Sound - Products PB23 Phantom Power Adapter
Click the image to open in full size.
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Old 20th November 2012, 09:01 PM   #6
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I rather would do it myself.
I think I try to make with MC34063. Now I wait for components...

So, inside this box they put some electronics
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Old 20th November 2012, 09:32 PM   #7
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LM2587 12V to 48V diagram.JPG

I designed with LM2587 tools like this.
Your opinion will be much appriciated.

I decided to put max Iout as 70mA, but I think It would be to much.

thx for interesting
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Old 21st November 2012, 02:10 AM   #8
WSJ is offline WSJ  United States
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Quote:
Originally Posted by Steinberg View Post
I rather would do it myself.
I think I try to make with MC34063. Now I wait for components...

So, inside this box they put some electronics
The manual has a schematic. For about $25 on ebay, you could get the box with all the connectors and change the circuit to your design. Evaluate both circuits and see if you can improve the 48V converter.
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