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

Roman Sowa modular at go2.pl
Wed Jun 26 12:00:52 CEST 2024


The simple answer is - the biggest you can find that will fit in the 
case you plan to put them in. Watch out for maximum working current and 
DC resistance of the coils.

Roman

W dniu 2024-06-23 o 19:40, Jean-Pierre Desrochers via Synth-diy pisze:
> 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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