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Re: Are Linear Bench Supplies Really Quieter Than Switchers?

Posted: Wed Nov 28, 2018 11:15 am
by billshurv
Let me pull mine out and have a look how its tracked. Failing that will ask Jan.

That's a point. 12V to 10V reg will only have to drop 4.5V worst case with a lead acid battery. Hardly really needs to regulate much as long as it drops a couple of volts. (13V protection zener on board 9-10V recommended as max input)

Re: Are Linear Bench Supplies Really Quieter Than Switchers?

Posted: Tue Feb 26, 2019 12:03 pm
by Jacko
mediatechnology wrote:
Wed Nov 28, 2018 10:53 am
Thanks for the update. I bet the AC-powered performance WRT leakage current and hum will vary greatly with the particular USB supply used.

Still curious to see if there's a direct galvanic path between the USB DC 0V and the Switcher output 0V.
The power supply uses the LT3471 regulator and there does not seem to be galvanic isolation (though I am certainly not an expert in power supplies!).

There is a video at https://youtu.be/0Sb2mIbpzFk which has a good close look at the pcb. There seems to be a clear connection between the input and output grounds through the top copper plane.

Closeup photo: https://linearaudio.nl/sites/linearaudi ... ropped.jpg

best regards, jacko