Re: [time-nuts] measuring noise of power supplies (was: For those that insist on using switching power supplies)

2016-10-18 Thread Scott Stobbe
Reinforcing your first point. It is also worth noting that the sweet spot for switching regulators is about the same frequency as the AM band. Cars have had both switching regulators and AM radio for a while now. On Sun, Oct 16, 2016 at 12:06 AM, Perry Sandeen via time-nuts < time-nuts@febo.com>

Re: [time-nuts] measuring noise of power supplies (was: For those that insist on using switching power supplies)

2016-10-18 Thread David
On Tue, 18 Oct 2016 11:27:05 +0200, you wrote: >On Fri, 14 Oct 2016 22:25:55 -0500 >David wrote: > >> I have done this and it works great; the breakpoint between the >> chopper amplifier and the low noise amplifier can be adjusted to >> combine the wideband noise from the

Re: [time-nuts] measuring noise of power supplies (was: For those that insist on using switching power supplies)

2016-10-18 Thread Attila Kinali
On Fri, 14 Oct 2016 22:25:55 -0500 David wrote: > I have done this and it works great; the breakpoint between the > chopper amplifier and the low noise amplifier can be adjusted to > combine the wideband noise from the low noise amplifier and the 1/f > noise and drift of

[time-nuts] measuring noise of power supplies (was: For those that insist on using switching power supplies)

2016-10-15 Thread Perry Sandeen via time-nuts
List, Two Points 1. Switching regulator power supplies are here to stay and will replace most transformer types as the are cheaper, smaller, and more energy efficient. They have improved to the point of being used in medical equipment for patient monitoring equipment that picks up milli-volt

Re: [time-nuts] measuring noise of power supplies (was: For those that insist on using switching power supplies)

2016-10-14 Thread David
I have done this and it works great; the breakpoint between the chopper amplifier and the low noise amplifier can be adjusted to combine the wideband noise from the low noise amplifier and the 1/f noise and drift of the chopper amplifier. Jim Williams wrote a couple of different application notes

[time-nuts] measuring noise of power supplies (was: For those that insist on using switching power supplies)

2016-10-14 Thread Attila Kinali
On Fri, 14 Oct 2016 12:00:08 -0600 "Cube Central" wrote: > How would one go about testing power supplies and seeing how noisy they > are? I have the standard suite of tools, an oscilloscope and a little > (dangerous) know-how. I am just not sure what to look for or how