• [VK2TPM] QJ-PS30SWI low noise switching power supply with "noise offset

    From VK2TPM via rec.radio.amateur.modera@21:1/5 to All on Wed Feb 23 05:43:28 2022
    XPost: aus.radio.amateur.misc, rec.radio.amateur.misc

    marxy's musing on technology

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    QJ-PS30SWI low noise switching power supply with "noise offset" feature

    Posted: 22 Feb 2022 09:20 PM PST http://blog.marxy.org/2022/02/qj-ps30swi-low-noise-switching-power.html

    In my pursuit of low receive noise I've been using a linear power supply
    but the one I have makes a loud audio hum sound that is a bit annoying. Searching for low noise switching power supplies I stumbled across the QJ-PS30SWI which I purchased for AU$120 from AliExpress.The supply is quite low noise, but there are lines visible on the waterfall about every
    2kHz if I turn the preamp on.Unlike

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