[time-nuts] Anybody want a Thunderbolt power supply?

Adrian Godwin artgodwin at gmail.com
Wed Aug 31 16:52:50 EDT 2016

I'm being Devil's Advocate here because I certainly realise switchers do
generate high frequency noise. But wasn't the intention of them to make
filtering easier, with smaller filter components, exactly because they
operate at higher frequencies ?

So why do they fail ? Is it cost-cutting to make them only just good enough
for typical uses ? Shouldn't it be possible to make the best possible
supply from a switcher, if only cost and weight weren't the first
considerations ?

On Wed, Aug 31, 2016 at 9:45 PM, Mark Sims <holrum at hotmail.com> wrote:

> Yes,  at times I used a two stage linear regulator.  The first stage had
> excellent low freq rejection and the final stage too care of the high freq
> stuff.
> Some times a full linear supply is not a viable option due to power
> dissipation/size issues or the utter convenience of using a switching wall
> wart.
> --------------------
> > Precisely the reason to avoid switchers entirely and use linear-only
> voltage regulators to power noise-sensitive circuits.  As I mentioned
> before, I had to use two stages of well-designed linear regulation to
> make any switching supply acceptable (at a time-nuts level) for use with
> a Tbolt.
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