Author Topic: Recommendations for a High Quality +/- 15V Power Supply  (Read 2499 times)

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Offline cpsmusicTopic starter

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Recommendations for a High Quality +/- 15V Power Supply
« on: November 13, 2019, 04:44:09 am »
Hi,

I'm a musician and have a small home studio. I'd like to build a high quality +/- 15V power supply to power a W492EQ. More details of the project can be found here:https://groupdiy.com/index.php?topic=28332.0

I have beginner-to-intermediate level electronics knowledge and have been researching power supplies. Problem is, the more I read, the more I'm confused about what I need. I don't want to go down the "audiophile path" and include things that aren't necessary. However, as this is a one-off project I don't mind going the extra mile in terms of quality. i'm hoping to get either a PCB or a kit.

Just wondering what people would recommend for this project?

Cheers,

Chris
 

Offline Hiemal

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Re: Recommendations for a High Quality +/- 15V Power Supply
« Reply #1 on: November 13, 2019, 06:45:36 am »
Well, you have a few different options.

The easiest, and simplest method would just to use a center tapped transformer, and two linear regulators to give you your plus and minus rails. Add some decent filter capacitance, and you have a pretty foolproof bipolar supply. Of course, this requires mains.


If your project is battery powered, then you could try a charge pump; keep in mind though most charge pumps are relatively limited in their output power capability, typically in the range of 20 mA. It's also hard to find a high voltage charge pump that can handle 15 volts, so this might be disqualified based off of that alone.


Then there's the DC-DC converters; an inverting buck/boost converter could give you your negative rail, and a normal boost converter gives you your +15 rail. Biggest downside to these is noise, and they also typically require a minimum load to prevent oscillations.


There's also AC-DC switch mode power supplies, which could also give you your plus and minus rails.


All of these options you can buy off the shelf solutions for. Meanwell makes good AC-DC converters.


As to what is "best", well.... Eeeh. I'd lean towards just a transformer since it's pretty foolproof and is probably going to be the cheapest solution too. This is my opinion though, and I'm sure there will be people who disagree.
 
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Online MarkF

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Re: Recommendations for a High Quality +/- 15V Power Supply
« Reply #2 on: November 13, 2019, 01:51:46 pm »
In case you need the simple linear regulator design (+/-15V @ 1A):

Click for larger picture.
871402-0

And a PCB layout I did for power supplies I built:

871406-1



« Last Edit: November 14, 2019, 04:15:40 am by MarkF »
 
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Offline AG6QR

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Re: Recommendations for a High Quality +/- 15V Power Supply
« Reply #3 on: November 13, 2019, 02:47:13 pm »
Check out the Elenco XP-720, available as a kit or preassembled.  The manual is online and includes detailed schematics and theory of operation.  This is a classic linear power supply with a center-tapped transformer.  If it doesn't meet your needs, it might form a starting point for something that does.

It is only rated at one amp on each rail (there is also a 5V rail rated at 3A), and it is big and heavy compared to switching supplies.

 
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Offline dom0

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Re: Recommendations for a High Quality +/- 15V Power Supply
« Reply #4 on: November 13, 2019, 04:05:24 pm »
With 8 NE5532s the circuit shouldn't need more than ~200 mA. +-15 V @ 200 mA you can do with an AC wall-wart and dual one-way rectification.
,
 
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