Said,
I can give you C code for a Silabs 8051 driving an I2C RTC in bit-banging mode
(works with ANY chip)
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: saidj...@aol.com
Sender: time-nuts-boun...@febo.com
Date: Tue, 28 Feb
On Tue, 28 Feb 2012 11:42:51 -0800
Chris Albertson albertson.ch...@gmail.com wrote:
It's clear to me from seeing all those screws that
the 5680 needs to be firmly connected to some kind of heat sink even
it only a large plate.
It could also be that those screws are used to hold the top
and
I am fitting one of these into a HP 5335A counter. The project became a bit
more involved than it first seemed and part of that is how to deal with the
cooling. The manual shows an AC fan but it had been replaced (sloppily, I might
add) with a DC fan which was terribly noisy. I found a much
Pete
I have obtain HP gear that someone snitched the power supply or regulator
boards from. Since I ultimately will use the gear for myself and not
re-sell it. I re-fabricate the functions with modern technology. 3 term adj
regs etc. What can I say it works and is reliable. Is it perfect really do
That is exactly what happened here, the board is from a much earlier S/N range.
Even if I have to spend some $'s, the total price will still be
reasonable. That is
as long as I don't charge my time :-)
And with the 5370B being a pre-make-it-small design there's plenty of room for
subsitutions
Low noise voltage at the cost of noise current which is around 1000 times that
of low noise JFETs.
The discussion suggest that opamps contribute to the sideband phase noise
of the signal. I am interested in the mechanism that adds this phase noise.
It would have to be a small shift in either
Bill wrote:
Low noise voltage at the cost of noise current which is around 1000 times that
of low noise JFETs.
Sure, but the noise resistance (input termination at which voltage
noise and current noise contribute equally to the output noise) is
still around 400 ohms -- anything lower and
System noise is the question. If the driving impedance is low, then voltage
noise is more significant than current noise.
You simply can't look at the noise of the part. The key is the noise of the
entire circuit.
-Original Message-
From: Bill Fuqua wlfuq...@uky.edu
Sender:
Hi
For a variety of reasons, you are trying to match a 50 ohm line in a
distribution amplifier. The simplest reason is that mismatch adds
reflections and can degrade timing.
You *could* use transformers or filters to transform to higher impedance,
but they add phase shift. Phase shift is a
That is one of the better uses for a 5680. I have a counter that is
non-function because some one salvd the HP OCXO from it and I'm
thinking that a 5680 would fit inside. But then I thought again and
the 5680 can fit outside.
One problem I think with your setup is that the 5680' temperature
li...@rtty.us said:
You *could* use transformers or filters to transform to higher impedance,
but they add phase shift. Phase shift is a problem if it changes (over time,
temperature, vibration, phase of the moon...). Change in phase = change in
time = signal is degraded.
Transformers are
Dunno if you have seen this on ebay:
260967834514
It's an AD9850 with a 125 MHz crystal mounted up on a .1 spacing board
with pins, for about $8 free shipping from the Old Country. I bought 4
of 'em for the in case box (in case I need one). I have some OCXO's in
the 100 MHz neighborhood that will
Don
Thanks for the heads up and it is amazing I just bought a few since I
always seem to need various signals. It is amazing board oscillator etc.
All in a handy dip style board I can actually work with.
Regards
Pual
WB8TSL
On Wed, Feb 29, 2012 at 4:42 PM, Don Latham d...@montana.com wrote:
Don
Thank you bought 2
Bert
In a message dated 2/29/2012 4:45:08 P.M. Eastern Standard Time,
d...@montana.com writes:
Dunno if you have seen this on ebay:
260967834514
It's an AD9850 with a 125 MHz crystal mounted up on a .1 spacing board
with pins, for about $8 free shipping from the
Hi
It's always a that depends sort of thing. If you are after total
perfection, then indeed any phase shift is suspect. That includes the shift
from the delay in the op amp.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Hal
On 2/29/2012 1:42 PM, Don Latham wrote:
Dunno if you have seen this on ebay:
260967834514
It's an AD9850 with a 125 MHz crystal mounted up on a .1 spacing board
There are several vendors selling similar things. I bought a couple and
have just pulled the 9850 off one for another project of
All the chip vendors sell parts in China in quantity for about 30% to 50%
less than quantity pricing in the US.
When asking distributors in China how this is possible they say we Chinese
expect this pricing, otherwise we wouldn't use these parts
This is why it's so hard to compete with
another DDS to consider is the AD9851, same boards just a few $'s more
-pete
On Wed, Feb 29, 2012 at 3:52 PM, saidj...@aol.com wrote:
All the chip vendors sell parts in China in quantity for about 30% to 50%
less than quantity pricing in the US.
When asking distributors in China how this is
Hi
They look like part of an eval kit. The docs on the kit might be out there.
Bob
On Feb 29, 2012, at 5:47 PM, Dan Rae dan...@verizon.net wrote:
On 2/29/2012 1:42 PM, Don Latham wrote:
Dunno if you have seen this on ebay:
260967834514
It's an AD9850 with a 125 MHz crystal mounted up on
Hi
If it is a normal FE it is pretty close at 15 minutes and quite good after an
hour or so. It certainly will beat the original OCXO at at hour. You might just
run it when the counter is on and forget about running it in the standby mode.
Bob
On Feb 29, 2012, at 1:15 PM, Chris Albertson
Hi
The 9851 is a bit more quiet.
Bob
On Feb 29, 2012, at 6:54 PM, Pete Lancashire p...@petelancashire.com wrote:
another DDS to consider is the AD9851, same boards just a few $'s more
-pete
On Wed, Feb 29, 2012 at 3:52 PM, saidj...@aol.com wrote:
All the chip vendors sell parts in
On 2/29/12 4:20 PM, Bob Camp wrote:
Hi
They look like part of an eval kit. The docs on the kit might be out there.
Bob
Like this
http://www.analog.com/en/content/CU_AD9850_evaluation_tools/fca.html
The part has been around a while
* AD9850 Evaluation Board Software for Windows 3.1
Sourcing parts in China is very different from the US or Europe. When I buy
parts in the US I will first go to the distributor and get their price, then I
will go to the manufacturer and get promised a better price, still through the
distributor. The distributor still gets a cut, even if the
No kidding! My complaint for some years now is that chips and such are
sold the same way as 19th century rubber goods...reps, jobbers,
distributors, wholesalers, uncle TOM cobleigh and all...
AnalogD does have a web store!
Don
Peter Gottlieb
Sourcing parts in China is very different from the US
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