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

Jean-Pierre Desrochers jpdesroc at oricom.ca
Sun Jun 23 19:40:14 CEST 2024


 

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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