19 April 2024, 12:28 | #1 |
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Location: Manchester
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Adding Ferrite to modern replacement PSU
Hi to all,
A few years ago I bought a few of the modern switching power supplies for my A1200's from a seller in Poland. I've not been able to make use of them however due to the terrible amount of high frequency noise they produce (see the attached photo of the A1200 running the Coma demo). I'd like to try adding a ferrite to eliminate the noise. Does anyone know if the type that clip around the cable would be sufficient? I seem to recall reading some info in the past that such switching power supplies producing high frequency noise need a pretty large ferrite and perhaps coiled around the ring type? I'm hoping that the clip-on type such as the ones you commonly see on laptop power supplies will be sufficent as coiling the cable through a large ring would be pretty ugly and also would lose a lot of its length. |
19 April 2024, 14:27 | #2 |
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Location: Augusta, Georgia, USA
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I don't think ferrite will fix it, but you could try and see. The problem here is lack of proper HF filters. It should never have been sold this way.
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19 April 2024, 15:23 | #3 | |
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Location: PL?
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Quote:
Ask seller for support. Assumption is your A1200 was recapped properly so it is not problem on your side. |
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19 April 2024, 23:21 | #4 | ||
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I have an AT power supply for my main A1200 which is fine and also have my 90's towered 060 A1200. I intended to give one of them to my brother for his A1200 which now has a pistorm installed so it'd be good to resolve the noise. The seller said at the time something lame along the lines of "we can't make power supplies with the same standards today". |
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20 April 2024, 00:46 | #5 |
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Location: Stockholm
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Please mention the seller and the model so the rest of us know what to look out for.
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20 April 2024, 01:34 | #6 |
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20 April 2024, 15:37 | #7 | |||
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Location: PL?
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Quote:
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I would inspect visually PSU and search for capacitors issues... |
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