[time-nuts] For those that insist on using switching power supplies

Scott Stobbe scott.j.stobbe at gmail.com
Fri Oct 14 00:30:11 EDT 2016

Benchtop linear power supplies also share in some deceptive marketing
regarding noise. Some have horrible 1/f noise, others are on par to a
tl431, which isn't too bad. Some will have spurious tones 10's of dB above
the Gaussian noise spectrum. Unfortunately most linear power supplies only
spec a total rms noise over 20 Hz - 20 MHz. Whether that's a flat power
spectrum or a handful of tones, is a test it and see senario.

On Wednesday, 12 October 2016, Pete Lancashire <pete at petelancashire.com>

> Although this link
> http://www.righto.com/2012/10/a-dozen-usb-chargers-in-lab-apple-is.html
> is about the little Line to 5V USB adapters one sees everywhere now days,
> it does show how crappy the output looks when one gets a 'bargin'
> -pete
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