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There is a concept in temperature control called feed-forward.
In this case you would sample the supply line with an inverting
amplifier and use it to increase the oven drive signal as the
line voltage decreases. The goal is
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Surely there will be an improvement in oven temparature regulation, by using
a regulated supply, but whether or not this improvment is marginal or
significant would have to be determined either by experiment [my favourite],
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- Original Message -
From: Bruce Griffiths [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, October 26, 2007 12:36 PM
Subject: Re: [time-nuts] Parallel
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Hi Said,
Just info, yesterday I have received the Unit.
It went thru the German Customs too. No problem.
Many thanks and regards,
Ernie HG5ED
-Original Message-
From: [EMAIL PROTECTED]
To: [EMAIL
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Hi Grant,
What`s wrong with a diode and a
capacitor?.Don C.
- Original Message -
From: Grant Hodgson [EMAIL PROTECTED]
To: Discussion of precise time and frequency
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The Efratom M100 manual is now available to download at:
http://www.ko4bb.com/Manuals/5)_GPS_Timing/Efratom - M100.pdf
Regards,
Bill
af4jg
Original Message
Subject:Re: [time-nuts] M100.pdf
Date:
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Don Collie wrote:
Hi Grant,
What`s wrong with a diode and a
capacitor?.Don C.
Otherwise known as an AM detector??
Depends if just the absence of a signal is to be detected
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Don Collie wrote:
Bruce
I don`t think the higher current created when a fuse is used instead of
near-instantaneous current limiting is alleged, but rather a real problem
that can cause damage further down the line. Fast
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At 9:04 AM -0400 10/26/07, Bill Powell wrote:
The Efratom M100 manual is now available to download at:
http://www.ko4bb.com/Manuals/5)_GPS_Timing/Efratom - M100.pdf
Regards,
Bill
af4jg
Bill,
Thanks for publishing that
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Great Ernie!
BTW: we have posted the latest version (1.13) of the software on our website
which fixes some minor issues we found.
bye,
Said
** See what's new at http://www.aol.com
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I do have some experience with temperature controlled ovens. I found that a
long term plot of the temperature while using an unregulated supply on the
oven heater showed small random variations due to voltage variations.
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Considering the efficiency and easy availability of switchmode
supplies these days, I would never bother with a linear regulator
in a new design.
For instance national has a series of switch mode regulators (LM25xx)
which
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Poul-Henning Kamp wrote:
Considering the efficiency and easy availability of switchmode
supplies these days, I would never bother with a linear regulator
in a new design.
For instance national has a series of switch mode
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Poul-Henning Kamp wrote:
Considering the efficiency and easy availability of switchmode
supplies these days, I would never bother with a linear regulator
in a new design.
For instance national has a series of switch
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Switchmode regulators really are risky for use in a low
noise environment. Even if you can reduce input and
output conducted noise to acceptable levels, the
opportunity for magnetic coupling from the inductor
to adjacent
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Pete wrote:
Switchmode regulators really are risky for use in a low
noise environment. Even if you can reduce input and
output conducted noise to acceptable levels, the
opportunity for magnetic coupling from the inductor
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J.D. Bakker wrote:
Poul-Henning Kamp wrote:
Considering the efficiency and easy availability of switchmode
supplies these days, I would never bother with a linear regulator
in a new design.
For instance national
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In a message dated 10/26/2007 14:59:29 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
That is a recipe for disaster if one wants a really low noise oscillator.
This is particularly true if one is a beginner.
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Great idea!!,Don C.
- Original Message -
From: Max Robinson [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Saturday, October
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Well, there is another trick of the control trade, used to bring
batch process reactors up to the desired temperature in a hurry.
At first, you turn on full heat for an experimentally determined
time. You turn it off at the
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This has been a fascinating and educational thread! I
have always been aware of noise coming from switching
regulators - just have Argo or Speclab look at your
laptop's sound card with no input signal and there
is plenty to
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Tom Clifton wrote:
This has been a fascinating and educational thread! I
have always been aware of noise coming from switching
regulators - just have Argo or Speclab look at your
laptop's sound card with no input signal
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Don Collie wrote:
Great idea!!,Don C.
Now all you need is a current limited bypass switch to protect the load.
Such a switch is relatively easy to implement.
Bruce
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David,
Sorry about the link - not my file or website. I found the manual on
ko4bb's web site,and just copied the link that I used to download it
myself. Sorry about the confusion. Hopefully others can navigate in to
find
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I know I have not been consistent with file names. I have started converting
the directories to underscores instead of blank spaces and will work my way
through the directory structure in an attemp to rename everything in a
You can find lots of documentation at:
http://www.hpmuseum.net/exhibit.php?hwdoc=74. Much less painful to download.
- Original Message -
From: Neon John [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Saturday, October 20, 2007 11:07
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I have the ORIGINAL HP7475 Graphics Plotter SERVICE MANUAL dated June 1990.
It has complete schematics, disassembly, adjustments, parts lists.
I also have a rather extensive supply of new HP short pen style plotter pens and
I`ve always wondered about noise from batteries - please tell us more
Bruce!! [also wondered about noise from the electrolytic action of
aluminium, and tantalum electrolytic capacitors, and wondered if the
reference bypass capacitor in a 723 should be a plastic dielectric type,
rather than
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I'm a little surprise that nobody has done an extensive search. The
M100 manual has been available on the www.to-way.com Web Site for
months x(n)..
TTFN
Had, K7MLR
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Don Collie wrote:
I`ve always wondered about noise from batteries - please tell us more
Bruce!! [also wondered about noise from the electrolytic action of
aluminium, and tantalum electrolytic capacitors, and wondered
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Don Collie wrote:
I`ve always wondered about noise from batteries - please tell us more
Bruce!! [also wondered about noise from the electrolytic action of
aluminium, and tantalum electrolytic capacitors, and wondered
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