By "noise canceling", my crazy idea was something like this:
Attach a microphone on the transformer, apply a band-width filter at 900Hz,
phase delay 180 degrees and output the amplified out-of-phase signal via a
transducer or speaker mounted on the chassis.
Complete overkill, but could it possi
l Message -
From: neonixie-l@googlegroups.com
To:
Cc:
Sent:Tue, 15 Jul 2014 06:36:39 -0700
Subject:Re: [neonixie-l] Sperry radar clock now working!
The 900 Hz noise of which Morris is mentioning is 'most likely' being
caused by physical vibration of the lamination's within one or mo
The 900 Hz noise of which Morris is mentioning is 'most likely' being
caused by physical vibration of the lamination's within one or more of
the transformers, and there is not much that can be done about it, if I
am correct. But I'll wait and see along with the rest of us as to what
Morris has
Morris that is truly awesome. I admit to having no clue how this could work
after all, and to having to go back and re-read your "Saga of the Sperry part
3" article - and I suspect I'll do so several times more before I "get it"!
Would a simple noise-canceling unit tuned to the transformer frequ
Thanks Tom,
The E1T clock is at:
https://www.youtube.com/watch?v=J5I_L4KY4Qo
The video doesn't show it well but there's a little IN-17 nixie on the
front that displays the number of satellites seen by the internal GPS
receiver. It was a nice technical challenge but to be honest I don't think
-l@googlegroups.com
Subject: Re: [neonixie-l] Sperry radar clock now working!
Thanks for the comment. It's hard to make the hands much thicker. It's
radially scanned from the centre out so adding more scan lines makes the
hand wider at the tip than at the base - the opposite of what&#
and I'll give you two bob for it.
John K
- Original Message -
From: neonixie-l@googlegroups.com
To:
Cc:
Sent:Mon, 14 Jul 2014 19:58:06 -0700 (PDT)
Subject:Re: [neonixie-l] Sperry radar clock now working!
Thanks for the comment. It's hard to make the hands much thi
Hi Morris,
Yes I do, I follow you achievments with interest, where can I see pics of
the E1T clock?
Your display sounds complex, a thee phase scanning yoke! Why not just have
an X-Y vector display and drive that directly by the micro?
I do have a mate with a vacuum chamber (actually a commercial
Thanks Tom,
No it's a static yoke which is 3 phase delta wound and excited with
suitable waveforms generated by a micro. It's the original 900 Hz radar
power tranny that's the culprit.
BTW you may remember me as the fellow who once bought a E1T chassis from
you for experimentation. That ended
Morris Odell
> *Sent:* maandag 14 juli 2014 11:03
> *To:* neoni...@googlegroups.com
> *Subject:* [neonixie-l] Sperry radar clock now working!
>
> Hi all,
>
> I've got the clock displaying time now. The video shows it upside down on
> the bench so it's at a few minute
@googlegroups.com
Subject: [neonixie-l] Sperry radar clock now working!
Hi all,
I've got the clock displaying time now. The video shows it upside down on
the bench so it's at a few minutes past 12. That howling power transformer
is a distraction, I'll have to wrap it in some sound abs
Very nice Morris. The last display like this I saw had a rotating yoke with
slip rings, so if yours has one the power transformer must be a real
howler. It sounds like 400Hz too.
Can't wait to see it completed.
Tom Harris
On 14 July 2014 19:02, Morris Odell wrote:
> Hi all,
>
> I've got th
Hi all,
I've got the clock displaying time now. The video shows it upside down on
the bench so it's at a few minutes past 12. That howling power transformer
is a distraction, I'll have to wrap it in some sound absorbing material
especially as I like to add Westminster chimes to my clocks :-).
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