Not too long ago I designed an integrator for a piezoelectric force transducer.
The customer wanted a rock-solid output after a step load on the transducer.
The capacitor of choice was PPS, used in surface mount form and less than 0.5uF
total capacitance. With a particular PCB material chosen fo
The problem comes if the load current on the 1.8V regulator sees significant
ups and downs. Think output regulator in particular. Might also happen with the
digital core if major rollovers align and the core spikes. Those current
changes get spread (admittedly reduced, too) by the bypass caps, r
John, I appreciate your minimalist goal, but I'll second Bill's section about
including the power supply voltage regulator and bypassing. Finding a good
regulator with wideband line regulation/rejection could prove a real search,
and such a fast chip as the Si5340 will need excellent broadband s
It might be possible to hand solder the 36-pin 0.5mm pitch QFN to this
Schmartboard product:
http://schmartboard.com/schmartboard-ez-qfn-36-pins-5mm-pitch-32-pins-65mm-pitch-2-x-2-grid-202-0043-01/
One question is would the die attach pad, which apparently needs grounding, get
enough heat sinkin
How about using a single 8-pin DIP IC that is under $2.50? The Microchip
MIC4422AYN "gate driver" takes a 3.3V signal in and produces a fast
rail-to-rail output swing, with a 4.5V to 18V supply range. Typical output
resistance is sub 1 Ohm, so not a problem driving a series back-terminated 50
O
Mark, best to use an adjustable current (current-limited) supply preset to
voltage regulate at 5V. That way you can have some control over the power
dissipated on the PCB. If you can, borrow a thermal camera and look for the
heat with that. (FYI our local library lends them out.) Without a therm
For quite some time (most of the last 10 years) Elektor magazine promoted
BASCOM-AVR as an easy to use development language for the AVR micro. They have
multiple books teaching BASCOM-AVR and a few hardware kits to go along.
BASCOM-AVR is still available at
https://www.mcselec.com/index.php?opt
>From https://www.maximintegrated.com/en/design/packaging/topmark/ the MAX3949
>is marked "AJK". I suspect BAA is some sort of date code.
> Sent: Wednesday, October 11, 2017 at 2:28 PM
> From: "Larry McDavid"
> To: teksco...@yahoogroups.com, "Time-Nuts Mail List" ,
> "HP Aglient Reflector"
> S
In my experience the term ferrite bead is used more loosely today. Most "beads"
that I've designed with were 100% machine placeable surface mount parts from
smallish 0402 chips on up to 10A rated honkers. Admittedly any tubular "bead on
wire" is not machine placeable in a surface mount oriented
Not impressed with the PCB layout, could have been much better. Input cap is
too far from regulator, connected to ground via longish (inductive) skinny
trace. Input might benefit from simple PI filter to reduce input ripple
current. Output caps should each have their own via, maybe even two each
I tear off a short piece of solder and push it up against the part (with
orangewood stick) before picking up the iron.
Bob LaJeunesse
> Sent: Sunday, November 06, 2016 at 7:17 PM
> From: "Hal Murray"
> To: "Discussion of precise time and frequency measurement"
>
> Cc: hmur...@megapathdsl.ne
Adrian,
Here's a picture of the package you have, with the TI logo on the "heatsink". I
pulled it just now from an old car stereo. The PNP Germanium GC588 crosses -
not correctly! - to a differently packaged NTE102A which is rated for 1A and
32V with some decent gain. I suspect the GC588 is clo
Another admittedly low-budget way of heating both ends is to use a heat
spreader. Solder a short piece of braid to one component end, fold it over the
top of the part, and solder it to the other end. Heat the braid in the center,
add solder until both ends are melted, and lift the combination of
One needs to be careful when generating the 32.768KHz signal. If it's used to
clock a PLL internal to the clock's microcontroller then providing a the right
pulse count, at the wrong frequency and interrupted, could result in poor or no
clock operation. If it drives the display multiplexing ther
For general group information, as SiTime datasheet is not open to the public
(yet?).
https://www.sitime.com/products/precision-super-tcxo
Actually a MEMS oscillator, comparison video against quartz TCXO is interesting.
Claimed Key Features:
- 30x better dynamic performance for macro cells, smal
Check with the used equipment / property disposition department of the nearest
big research university. The one near me often has big UPSs at relatively
little prices.
Bob LaJeunesse
> Sent: Thursday, September 15, 2016 at 7:12 PM
> From: "Andy ZL3AG"
> To: "Discussion of precise time and freq
The concept of track & hold was well understood in 1966 and documented in the
classic Philbrick Researches amplifier application book, now available at
http://www.analog.com/library/analogdialogue/archives/philbrick/computing_amplifiers.html
Bob LaJeunesse
> Sent: Wednesday, July 27, 2016 at 2:
> pins, and remove the whole darn thing (like Clint suggested). =P
>
> Thanks all!
>
> -Ryan Stasel
>
> > On Mar 25, 2016, at 12:52 , Robert LaJeunesse wrote:
> >
> > Personally I'd take a few minutes to look closer at the '232 chip with the
>
Personally I'd take a few minutes to look closer at the '232 chip with the
scope. Are the charge pump caps swinging 5V p-p and 10V p-p? if not swinging at
all, trash the chip. Is -V pin voltage about equal to the negative of the +V
pin? If so, that's OK. If not might have an output shorted, or a
>From the data sheet it looks like a megohm range bias resistor is needed (X1
>to X2) as well as the blocking / coupling cap.
Robert LaJeunesse
> Sent: Sunday, November 29, 2015 at 5:15 PM
> From: "Cash Olsen"
> To: time-nuts@febo.com
> Subject: Re: [time-nuts]
If the goal is to create two signals consistently spaced near 70us apart why
not use a good, fast 8-bit serial-in, parallel out shift register, clocked
cleanly at 100kHz? Using the outputs from stages 1 and 8 would result in a 70us
delay between signals. The data in would be fed 100KHz divided b
Looks like what I call a slide latch
https://www.google.com/search?rlz=1CAACAC_enUS590US590&es_sm=122&biw=1366&bih=631&tbm=isch&sa=1&q=d-sub+slide+latch&oq=d-sub+slide+latch&gs_l=img.12...0.0.0.208917.0.0.0.0.0.0.0.0..0.0.ccynfh...0...1..64.img..0.0.0.kopFXhwkvbM
Readily available parts at DigiKe
IIRC one would use a divide by 4 circuit with the final output feeding back to
an exclusive-or gate through which the (square wave) source clock passes. The
ex-or effectively adds a clock edge to the divide by four, making it divide by
three. It also changes the effective clock edge, so the fina
The Teensy 3.1 (http://www.pjrc.com/store/teensy31.html ~$20) has a Flex Timer
Module that appears to allow a single counter to be captured into independent
registers from independent inputs. Not sure, but PJRC tends to run the clock
fast (96MHz) so relative timing resolution should be much bett
One of the cheap and dirty ways to find a short is current tracing. Use a
voltage and current limited source and a matching detector to find where the
current flows. I've used a current limited DC supply as the source and, for the
detector, an old DVM with 10uV resolution. For an AC approach a s
While it may not be time-nut centric there is a great museum in Michigan that
has collections of both clocks and technology, along with a couple Stradavarius
violins and machinist tools used by Mr. Daimler. The Henry Ford Museum in
Dearborn, MI has been actively enlarging their technology collec
I use an older XP based "drag and drop freeware PDF unlocker" that strips many
PDF restrictions. It made the file below quite printable.
Bob L.
> Sent: Monday, November 24, 2014 at 9:05 AM
> From: "Mark Kahrs"
> To: "Discussion of precise time and frequency measurement"
>
> Subject: Re: [tim
Using 74AC parts on what I think of as a pluggable breadboard (e.g.
http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=2295705&MER=bn-me-ca-r1-best-sto-5)
is asking for trouble. The parts are RF fast and the pluggable board has not
very good contact resistance and certainly more inductance a
Sure looks like Leeds & Northrup to me.
http://www.ebay.com/itm/Leeds-and-Northrup-Light-Beam-Galvanometer-2430-C-/281460565063?pt=LH_DefaultDomain_0&hash=item41885b6447
Bob L.
> Sent: Wednesday, October 08, 2014 at 2:41 PM
> From: "Dan Veeneman"
> To: time-nuts@febo.com
> Subject: [time-nuts]
It's simple, but not obvious. The LM3900 is a Norton amplifier, and while it
has differential inputs they are current driven. (Most older op amps are
voltage driven.) The LM3900 is powered from 10V, so I think of that as just
above the maximimum output voltage. Both the upper amplifier and the s
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Details of the DCF77 project, including source code, can be seen without an
Elektor subscription / membership. The article's author has specifics posted at
http://www.marvellconsultants.com/DCF
Bob LaJeunesse
>
> From: Alexander Pummer
>To: Discussion of preci
Just a note that there will be some Time Nuts at the Dayton Hamvention this
weekend. Don't be surprised to run into one or more at Flea Market spaces FW
1902/3/4/5. We'll have shade and chairs to sit yourself in.
Bob LaJeunesse
p.s. Unless John Ackermann or Tom Holmes grabs it first I'll have
The PLCC "plug" portion for an adapter can be had from at least one
manufacturer for $36 US:
http://www.ironwoodelectronics.com/catalog/Content/Drawings/PL-PLCC044-S-01FDwg.pdf
Bob LaJeunesse
>
> From: Jason Rabel
>To: time-nuts@febo.com
>Sent: Wednesday, May
AD was comparing apples and oranges. The LTC6957-3 has CMOS outputs, which go
from 0.2V to Vdd-0.3V (with a 3mA load). Perhaps they were looking at the
LTC6957-1 which is LVPECL and would have a rather small swing. The LTC6957-3
should drive the AD9852 if its requirements are as noted below.
Bo
When there are extraneous characters and a line feed added by some word
wrapping I use this method:
1) "Forward" the email
2) delete the extra characters, getting the proper URL back
3) Copy the URL to the clipboard
4) Open browser and paste URL in
After that, trash the "forward" email.
The l
FWIW on the topic, since I've been doing some Arduino stuff of late. Bear in
mind like many of you I'm not a software person, so that part doesn't come so
easy to me.
The $3.71 ebay board looks nice, but it's not an official Arduino design, and
may not be well documented. All official Arduino b
Do you intend to use this wall wart to power the circuit as well? I hope not,
as a capacitor input rectifier scheme will result in decidedly non-sinusoidal
current on the transformer secondary. Given a low-cost transformer with
noticeable inductance and resistance the resulting waveform distorti
Must be military prices. If using 5 PPM resistors in the build a reference much
better than that isn't needed, especially if the temperature is somewhat
controlled, like time nuts do. A commercial 3 PPM/C part, the LM4140A, is $4.54
each in singles. At 2.2uV p-p it's reasonably quiet as well.
C
Jellybean resistors can have a tempco in the 100s of PPM per degree C. Some
precision resistors are as low as 25 PPM/C while really good resistors can be
had at 5 PPM/C. Better yet look for a resistor array where part tracking is
called out. Some arrays get below 5 PPM tracking so the division r
Since most of those cheapo movements are a simple single-coil motor, energized
with alternating polarity short pulses, it would seem that there is no need for
a "24 hour" movement. You can just have your micro pulse it twice the normal
period, but with the same as normal pulse width(s). Check ou
The US POTS is digitized at 8KHz sample rate, so Nyquist says the highest
frequency you can accurately digitize is 4KHz. Allow some for a (fancy digital)
filter and 3400Hz is about the best you can expect. As for T1, almost right.
The 8K samples per second are u-law processed to 8 bits each for
If it had 4 color bands 2701 you are likely reading it backward. 1072 would be
10.7K
Bob L.
>
> From: "brucekar...@aol.com"
>To: time-nuts@febo.com
>Sent: Thursday, November 21, 2013 1:11 PM
>Subject: [time-nuts] Off-Topic Question -- German Composition Resist
Many times the 32KHz oscillator is just used for ultra-low power rudimentary
CPU timing, not so much for a "time of day" clock. The crystal gives more
reliable timing than an RC delay, and the low power works fine for a "press to
wake up" type application.
Bob LaJeunesse
>___
A couple tricks I've learned along the way: 1) If using a switching supply is
required to get a higher voltage, follow it with a good LDO to reduce the noise
level. I've done this successfully for powering handheld radio microphones with
built-in amplification, video amplifiers, and for operatin
FYI. Addresses LM317 noise in a simple implementation, how to reduce it, and
how it relates to other approaches and parts. Numerous graphs of noise voltage
versus frequency can prove enlightening.
http://www.edn.com/Home/PrintView?contentItemId=4422750
___
Actually the 5.25" drive case seemed like a better choice to me. I picked up an
Iomega external optical drive in a plastic case for a few bucks. Hard to get
open (hidden snap latches) but the plastic top was easy to machine with a
Dremel tool and knife. After making a large rectangular hole in t
Bob,
I would bump that base resistor up a lot higher, to load the FE-5680 less. The
PN has enough gain it only needs about 0.3 mA base drive to work as
intended. You'd get that with a 10K base resistor.
Bob LaJeunesse
>
> From: Bob Stewart
>To: Time Nu
Looking at the LM2596 datasheet the switch transistor saturation voltage is
1.5V max at 3A (1.16v typ). That and an educated guess of about 0.25V for
inductor loss combine to set the minimum difference between input and output.
The 1.23V reference is about +/-3% accurate, so after setting the "b
u trouble.
>The peaking of the filter gives you a steeper cutoff at harmonic frequencies.
>It rolls off just like any filter, but it starts from a higher peak.
>
>With the T you can do any Zin / Zout ratio provided the Q is high enough. If
>you want to do low power, set it up as
Bob, I need some education. For a low-pass filter I think series L and shunt C.
For two inductors that normally means 2-3 capacitors. If you use only one
shunt capacitor is the second L in series with it (as a harmonic trap)? Can you
point me to a design tool (or equation set) somewhere that sh
FYI, The MPSA18RLRAG is a stock item at Digi-Key, min beta 500 at 1 & 10mA, 45V
& 200mA rated, TO-92. $0.33 each.
http://www.digikey.com/product-detail/en/MPSA18RLRAG/MPSA18RLRAGOSCT-ND/1139919
>
> From: paul swed
>To: Discussion of precise time and frequency
Rigol, unlike most of the Asian based manufacturers, does have a support office
in the States. They have also had a noticeable presence at the Dayton
Hamvention. I'm rather pleased with the low-end Rigol scope I bought at Dayton
two years ago.
Bob LaJeunesse
>___
Marki,
I used an old thyratron filament transformer from a computer tape drive to
compensate for low line voltage in Detroit. Even though the transformer was
rated 10A it ran our old room air conditioner just fine. From the core size it
seemed more like a 200W transformer, and it never gave any
For the original Arduino Uno the $30 cost may be true, but there are lots of
other options in the Arduino family. The Pro Mini
(https://www.sparkfun.com/products/3) is only $10, being that it uses an
external serial to USB adapter (such as
the https://www.sparkfun.com/products/9718). The $1
Sorry to say the 6130A is an "all on one board" design. Not really suitable for
extracting the multipliers.
Shameless UN-plug: Another time-nutter has already taken the 6130A I was going
to have at Dayton.
Bob LaJeunesse
From: Dave M
To: time-nuts@febo.com
S
If easy means a temporary lashup, takes but one piece of gear. The Ballantine
6130A time mark generator takes in 10 MHz, produces from it a synchronous 1Hz
to
500MHz selectable in 1-2-5 steps. I've not tested mine for phase noise,
probably
not the best performer... but for $35 not a big concer
NB Note Bene literally "note well" per http://en.wikipedia.org/wiki/Nota_bene
I think of NB as "keep in mind"
From: Sarah White
To: Discussion of precise time and frequency measurement
Sent: Wed, May 1, 2013 6:14:56 PM
Subject: Re: [time-nuts] Atomic Watch.
One needs to think of better resolution here. How about a mirror galvanometer?
http://www.ebay.com/itm/Leeds-Northrup-Mirror-Galvanometer-/121086073505?pt=LH_DefaultDomain_0&hash=item1c314adaa1
http://www.ebay.com/itm/Cambridge-Technology-6810P-517-Moving-Magnet-Optical-Scanner-Galvanometer-/1907
Maybe I'm jaded a bit, but in this town the sub-10GHz optical stuff is
considered kinda slow. The guys down the street, Picometrix, have been doing
40+GHz optical receivers for over 15 years. They claim "1.5G to 100G and from
400nm to 1650nm" so probably they can help. http://www.picometrix.com/
FYI: Yet another use for GPS timing signals is proposed:
http://bits.blogs.nytimes.com/2013/03/28/a-marshall-mcluhan-approach-to-weather-forecasting/
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I've been known to just stack a 150 Ohm 1% chip resistor on top of a 75 Ohm
chip
resistor to bring the result down to 50 Ohms. Beats having to 1) remove the old
part, 2) clean up the pads, then 3) get the new one soldered down.
Bob L.
From: Arthur Dent
To: "
Hi Ed,
Thanks, your explanation of single PLL helps. I see it now somewhat in the
sense
of "only have to BUILD a single PLL" to make things work. I can appreciate the
simplified effort greatly. I also now think of the PLO as an oscillator locked
to a tuned harmonic that (probably) comes from s
Ed, busy weekend happening, delayed my response. Bob Camp's reply regarding the
DFF was spot on, and your connections below are just what to do. When feeding a
DFF with non-synchronous signals it's likely setup and hold times will be
violated. When that happens oscillation is possible, but usual
Ed,
A DUH! (i.e. "why didn't I see it") moment. I'm too used to thinking with an
analog RF hat when I follow Time Nuts. The DFF mix-down makes perfect sense,
and
clarifies to me some key points of your design. I would hope that for the
down-mixer you are using two DFFs cascaded with the same c
Ed,
Please forgive me for commenting, but I can't seem to follow your math. I
suspect there may be additional details you have not related, no big deal
there.
It doesn't help that I'm not familiar with the 8566B, and the manual I grabbed
from Didier's site doesn't give me numbers that match up
you are happy with.
Bob
- Original Message
> From: Fabio Eboli
> To: Robert LaJeunesse ; Discussion of precise time and
>frequency measurement
> Sent: Tue, January 15, 2013 10:04:37 AM
> Subject: Re: [time-nuts] Counter OCXO behaviour
>
> Robert,
> I asked the
re ebay #251211816860 the seller is one I've dealt with a few times before, and
had excellent service. I would not hesitate to deal with them again.
FWIW according to the US Post Office web site a 1 pound package to Italy ships
for $11.60.
Bob L.
- Original Message
> From: Fabio Eb
Take a look at the COM Express standard, designed for embedded x86 computing:
http://www.picmg.org/v2internal/specifications2.cfm?thetype=One&thebusid=3
Additionally there is a huge amount of design support literature from Intel,
Adlink, Ampro, Congatec, Kontron, Radisys, etc. COM Express boards
FWIW I've combined all 3 parts into one PDF and put them on KO4BB's great
website. Look in Manuals 10) Recent Uploads for "Reference na na Other-EDN
article SuccessfulPCBgrounding". Since my PDF did not have working links I used
a zip file with a Word doc for the links.
Another article that may
Corby,
FWIW many power rectifiers can be used as decent varactor diodes. The MV840 is
nominal 100pF at 4V with at least a 2:1 ratio (2.18 typ) from 4 to 25V. The
Vishay FGP50D-E3/54 is typically 100pF at 4V and drops to a shade below 50pF at
25V, or just over 2:1. Good news, it is in stock for
David,
Any chance you can buy it in your name and have it shipped somewhere in the
States? That person then can forward it without losing their chance to get one
as well. I have no experience shipping overseas but will second Bert's
suggestion plus volunteer myself to do it, if need be. How can
The indicated delay box is an unpowered device intended for timing composite
video and fine-tuning for color burst phase match. As such they are analog in
and out, require / expect defined source and load impedances (typically 75
Ohms), are slightly lossy, and 100% passive. I suspect they are pu
31 bits is just a convenient word size that comes out of the on-chip filter,
and
does not really relate to performance. Better to look at SNR which, at worst
case, is 120dB in high-res mode. That indicates performance just under 20 bits,
typical for better monolithic sigma-delta converters. Non
It could be done cheaply with a small micro that is clocked by the device's
TCXO
and uses an internal timer to measure the external clock frequency (or external
frequency divided by 10 or 16 if that better suits the timer capabilities). The
micro, when satisfied the frequency is close enough fo
The SR620 I worked on was unused for a long time, and would not turn on. Seems
the power switch was oxidized and would not self-clean. Had to unmount it so I
could use chemical cleaners without getting any residue on the case or PCB.
IIRC the whole front panel needed to be pulled to do that (not
That article is still alive:
www.tinaja.com/glib/WWVBexps.pdf
From: David McGaw
To: Discussion of precise time and frequency measurement
Sent: Wed, September 26, 2012 10:58:00 AM
Subject: Re: [time-nuts] WWVB PM Receiver
It's not a commercial unit. As it s
If I recall correctly it was in RF Design magazine many years ago that a
short article included a schematic for using an ultrasonic sensor and selective
amplifier (narrowband PLL?) to pick up the 32KHz vibration and convert it to a
measurable signal. I'd expect a normal microphone to pick up way
A part like any the Cypress PSoC family is much more flexible (but potentially
harder to program) than the PIC because it has hardware blocks that can be
made to do very useful work independent of the processor. The processor can run
on its internal RC oscillator while one digital block would ta
Mine are not handy, so I'm not sure it has 50% output duty, but the Ballantine
6130A Time Mark Generator is a potential candidate. It's not much more than a
chain of 7490 dividers fed from a 10MHz source, and has a (non-nut) ovenized
oscilltor built in. Even has synchronized multipliers that go
Those of you going to the Dayton Hamvention next weekend should be aware that
there will be other Time Nuts (and a Volt Nut or two) to be found there. Don't
be surprised if you see the Febo administrator himself relaxing in the flea
market beside the trailer in spaces 1901-1904. If you go past,
Previous link did not seem to work, sorry. Look in:
http://www.ko4bb.com/manuals/index.php?dir=05)_GPS_Timing/SRS
And many thanks to KO4BB for his collection!
Bob
From: Антон Ботвинёнок
To: time-nuts@febo.com
Sent: Wed, May 9, 2012 12:49:34 PM
Subject: [time-
http://www.ko4bb.com/Manuals/05)_GPS_Timing/SRS/SRS_SR620_Universal_Time_Interval_Counter_Schematics.pdf
From: Антон Ботвинёнок
To: time-nuts@febo.com
Sent: Wed, May 9, 2012 12:49:34 PM
Subject: [time-nuts] SR-620 circuit schematic diagrams
Hello! I have got
Ed, nice pix, thanks.
Looking at the Elko Varicon I have in hand (DXX455-1000-3) the contacts are
essentially hermaphroditic. This chassis mount housing gives up its contacts
fairly easily, just unbend a tab to release. Turn them 90 degrees and you have
something that works like the mating PCB
>From http://www.ti.com/tool/cc4000gpsem "GNS TC6000GN module and EM board"
At the GNS site I was able to get a TC6000GN-P1 data sheet and design guide.
Bob LaJeunesse
From: Attila Kinali
To: armstr...@sedsystems.ca; Discussion of precise time and frequency
HP once made a kit with DIP logic clip, logic probe, logic pulser, and current
tracer. Pulser and tracer made finding shorts pretty easy. For the SR-620 you
could disconnect the regulator and inject current pulses there, follow them
around with current tracer. The same basic trick works given a
See: http://softsolder.files.wordpress.com/2010/05/dsc00211-naked-crystals.jpg
From: Attila Kinali
To: time-nuts@febo.com
Sent: Tue, March 13, 2012 1:26:17 PM
Subject: [time-nuts] quartz crystal configuration in small cases
Hi,
I have been reading up on quart
Figure 8 on page 7 of H-P app note 200-2 (www.leapsecond.com/pdf/an200-2.pdf)
gives an idea for how HC-49/U strap-type parts are built, just with a smaller
blank than you mention. Not sure what's in SMT parts, but they have used
rectangular beam and fork structures for lower frequencies, at leas
Bruce,
You are not alone. After 20 years of OrCAD, currently using 9.1, I agree
completely. Eagle just seemed...weird. (I should add that I'm a RPN calculator
fan - where one chooses data before selecting the operator.)
That said, I will probably learn to use Eagle, as that seems to be the dar
FWIW Rigol pushes their 40MHz Analog Devices part to 100 MHz without any
problem
(seen in eevblog teardown). Yes it's sort of cheating, but if the part works
fine because all of the suppliers parts now yeild that fast due to an improved
process well, it saves a few dollars / quid / drachma...
Looks interesting, but...
1) The probe connectors are not the usual BNC. Are they anything common?
2) No mating cables or connectors provided for channels 3,4, and function
generator output.
3) Function generator output will have significant DC bias and no anti-aliasing.
4) Does not appear to be
Try searching for "thermally conductive adhesive gap filler" to get a good
selection of manufacturers like Bergquist, Chomerics, Masterbond, etc.
From: John Ackermann N8UR
To: Discussion of precise time and frequency measurement
Sent: Sat, February 11, 2012 1
I've used WD-40 to soften adhesive gunk such that a paper towel can be used to
wipe it off.
From: John Ackermann N8UR
To: Discussion of precise time and frequency measurement
Cc: Time-Nuts
Sent: Sat, February 11, 2012 11:56:01 AM
Subject: Re: [time-nuts] Rem
You don't. That's why the HC4046 has 3 phase comparators. Different strokes for
different folks...
From: Hal Murray
To: Discussion of precise time and frequency measurement
Sent: Fri, February 10, 2012 9:35:01 PM
Subject: Re: [time-nuts] GPS lock of the FE568
Sampling unsychronized signals with a DFF is problematic, since if setup and
hold times are not met the output could oscillate and maybe settle to some
noise
driven value. I can't help thinking that if you are sampling the 10MHz
signal at
1Hz the only way to get reasonable resolution is to sam
One can do many things with a small micro having programmable logic cells, such
as the Cypress PSOC. For grins I worked out (via spreadsheet) how to use the
PSOC digital divider blocks and the built-in clock PLL to get from 10MHz to
2.048MHz in a fairly precise manner. The scheme uses a divider
Specifying the digit scan transistor is a bit tricky, and often power
dissipation is just not a concern. Why? Consider the duty cycle. A transistor
switching one amp (a LOT for 7+1 segments) with a 0.6V saturation dissipates
600mW, but only when on. Given a 1/8 duty cycle that's 75mW average. An
http://www.tvtechnology.com/article/lightsquared-says-government-gps-tests-%E2%80%98rigged/211388
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