[sdiy] Using switching power supplies in series to get bipolar outputs?

Mikko Helin maohelin at gmail.com
Sat Nov 18 21:05:04 CET 2023


I use the IMR series modules in my small rack, two 12V and single 5V modules.
https://www.meanwell-web.com/en-gb/ac-dc-single-output-encapsulated-power-supply-irm--30--12st

On Sat, Nov 18, 2023 at 9:21 PM Shawn Rakestraw via Synth-diy
<synth-diy at synth-diy.org> wrote:
>
> I have 2 of the RS-75 12V supplies connected together with the center grounded and it works fine. My only concern with these power supplies is that they may be a little noisy. If you really crank the gain up (I mean a lot!) you will hear the whiney switching sounds that they make. It's not a complete deal breaker because I have not replaced them, but something to consider. Also, so few modules use the 5V, it's easy to just plug a 5V converter into a busboard if you have a module that needs that.
>
> Shawn
>
> On Sat, Nov 18, 2023 at 12:37 PM Oren Leavitt via Synth-diy <synth-diy at synth-diy.org> wrote:
>>
>> That will work as long as the + and - outputs are floating, isolated from ground. The center tap can be grounded in your system.
>>
>> On 11/18/23 8:08 AM, Scott Bernardi via Synth-diy wrote:
>>
>> I've noticed that most switching power supplies that offer bipolar outputs(i.e., to get +/-12v) have less current capability on the negative supply than the positive.  For example, the Meanwell 65B which has +/-12v and +5v, great for Eurorack, has
>> +5v max 8 amps
>> +12v max 3.5 amps
>> -12v max 1 amp
>> What about buying two +12v supplies, or maybe one that has +12v and +5v with another with just +12v, and hooking them in series with a center tap to get +/- 12v?
>>
>> This article https://www.mouser.com/pdfDocs/blog_how-to-operate-parallel-and-series-connection.pdf looks like it's possible, although they only talk about hooking them up in series to increase the output voltage rather than bipolar.
>> Has anybody done this?
>>
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at synth-diy.org
>> http://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at synth-diy.org
>> http://synth-diy.org/mailman/listinfo/synth-diy
>> Selling or trading? Use marketplace at synth-diy.org
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org



More information about the Synth-diy mailing list