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Author Topic: Interesting paper about power supplies impact on ADSL  (Read 395 times)

konrado5

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Weaver

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Re: Interesting paper about power supplies impact on ADSL
« Reply #1 on: July 25, 2018, 10:25:06 AM »

Thank you very much indeed for that Konrado. A special interest of mine.

I would love to measure the output of my PSUs, but I suspect that my 40 year old oscilloscope is no longer to be found.

I wonder where I can get some good power supplies then :-)
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burakkucat

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Re: Interesting paper about power supplies impact on ADSL
« Reply #2 on: July 25, 2018, 04:37:17 PM »

I wonder where I can get some good power supplies then :-)

Do away with all the switching-mode PSUs and replace them with a large capacity SLA battery, which is kept charged by floating it across the output of a classical set-up of a well-regulated & smoothed transformer, bridge-rectifier and capacitive/inductive/capacitive Pi filter.
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Weaver

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Re: Interesting paper about power supplies impact on ADSL
« Reply #3 on: July 25, 2018, 05:24:35 PM »

Indeed. I seem to remember we talked about this a long time ago. Good advice.
« Last Edit: July 25, 2018, 10:06:25 PM by Weaver »
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konrado5

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Re: Interesting paper about power supplies impact on ADSL
« Reply #4 on: July 25, 2018, 05:59:11 PM »

I don't understand why battery-powered routers are not made.
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Weaver

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Re: Interesting paper about power supplies impact on ADSL
« Reply #5 on: July 25, 2018, 10:07:10 PM »

I am wondering if I could get an old friend to knock me up something suitable to battery-power four modems.
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rpdmallett

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Re: Interesting paper about power supplies impact on ADSL
« Reply #6 on: July 25, 2018, 10:50:06 PM »

Doesn’t the article refer more to the internal regulation inside the modem than the external PSU?

Replacing the internal switchers with linear regulators sounds like an interesting project.
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4candles

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Re: Interesting paper about power supplies impact on ADSL
« Reply #7 on: July 25, 2018, 10:50:31 PM »

Do away with all the switching-mode PSUs and replace them with a large capacity SLA battery, which is kept charged by floating it across the output of a classical set-up of a well-regulated & smoothed transformer, bridge-rectifier and capacitive/inductive/capacitive Pi filter.
If it's good enough for BT...   :)
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burakkucat

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Re: Interesting paper about power supplies impact on ADSL
« Reply #8 on: July 25, 2018, 11:06:12 PM »

b*cat smiles, enigmatically, and bows.  ;)

Knowing how the GPO telephone service, and then the PO telephone service, powered all its electromechanical equipment (centralised battery, constant voltage) before migration to distributed mains-powered switching-mode PSUs (constant current), at around the time of transmogrification into BT, a return to the well-tried and tested technique was deemed appropriate for Weaver:angel:
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