[sdiy] ROLAND PSA-120S 9VDC switching supply filtering components..

[Oren Leavitt]

They're called "common mode" chokes. There are many ready made ones out 
there for SMPS filtering from various sources.

You may want to try some with your SMPS's and see you get good results.


On 6/23/24 12:40 PM, Jean-Pierre Desrochers via Synth-diy wrote:
>
> Is there anybody who made some researches on the type of inductors
>
> used in the new Roland 9VDC switching supplies ?
>
> The actual filtering circuit placed in series with the walwart supply 
> block output is shown here
>
> Inductor L1 and the toroid T1 are of unknown values.
>
> I can measure them with my meters but they are mounted
>
> On solid ferrite cores. So making them more difficult to reproduce..
>
> I ask because I already have a bunch of surplus 9vdc at 1A SMPS blocks
>
> acquired in the past and would like to use them to supply
>
> some of my guitar pedals..
>
> Using them with their ‘raw’ unfiltered 9vdc output makes an annoying
>
> background noise in the audio signal path..
>
> The ‘possible’ values of these 2 components, or a similar schematic
>
> That would do the same job would be appreciated.
>
> Thanks.
>
>
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