[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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