Magnus,
Why not just clock a good DDS (AD9854) with the reference frequency, and
run its
I & Q outputs into the motor via suitable LP filters and some power gain?
You might
need to periodically alternate between two different output frequencies to
get the desired
rotation speed (as with a
Something like this? (see image)
On Wed, Dec 25, 2019 at 1:02 AM Magnus Danielson wrote:
>
> Hi,
>
> I realize that I lack a microstepper. Consider that I have a stable and
> low-noise 5 or 10 MHz but I want to resynthesize to correct frequency
> and do phase-steps, and doing so without too much
Hi,
I realize that I lack a microstepper. Consider that I have a stable and
low-noise 5 or 10 MHz but I want to resynthesize to correct frequency
and do phase-steps, and doing so without too much loss of noise.
This has traditionally been done using a variation of techniques, but if
we would use
I do not see any transformer in the outputs. Common mode noise is never
your friend in any kind of distribution amplifier. That would be my biggest
complaint.
Otherwise it looks each output has its own filter but there are two outputs
per amplifier, so isolation may not be great between shared
I just found something funny. I have been thinking "clean" power supplies that
connects to AC mains. Then I thought, what about lead acid batteries?? So I
went to my lab and took some measurement. This is a 12V 7A lead acid sealed
battery, the kind commonly found on UPS devices.
The result?
Hi
Well, given the 10:1 price difference, I’d say it’s safe to guess the 58502A is
a bit better
piece of gear. The BG7TL is quite adequate for normal 10 MHz distribution
around the
lab / shack. None of these gizmos (including the 58502) are “good enough” if
you plan
on direct multiplication
Hi
> On Dec 24, 2019, at 6:40 AM, Poul-Henning Kamp wrote:
>
>
>
>> That again depends on topology and control type. The canned converters
>> are almost always optimized to have the lowest number of switches and
>> work with cheap magnetics (single coil) without easily entering
Hi
Since the devices may sit for a *long* time on the shelf, humidity can soak
into parts. Adsorption / desorption rates normally are very different so a brief
soak in may mean a *long* soak out.
Bob
> On Dec 23, 2019, at 4:01 PM, Hal Murray wrote:
>
>
> kb...@n1k.org said:
>> Like all
Gerard
Thanks for the cornucopia of information, much appreciated.
Cheers - John
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>That again depends on topology and control type. The canned converters
>are almost always optimized to have the lowest number of switches and
>work with cheap magnetics (single coil) without easily entering
>problematic operation modes, noise is only a secondary concern.
That
Am 23.12.2019 um 16:03 schrieb jimlux:
It is tough to build a "small" input filter that has good rejection at
low frequencies (<100kHz?)
Yes if you want a passive filter, but you can view an LDO as an active
low-pass in some sense. Again you need to take care that noise cannot
bypass it,
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