I hate to be argumentative, but you can't be low drop out and use an
emitter follower. Draw the circuit and convince yourself. You would need
a high side driver scheme to drive the base/gate, and that require some
sort of boost converter. It can be done on switchmode chips, but not in
a linear
On Mon, Feb 27, 2012 at 8:38 PM, Sam li...@digitalelectric.com.au wrote:
Netduino is the Arduino with an Ethernet interface on it.
Not quite, The Netduino is an open-source platform using the .NET Micro
Framework.
Looks like you a right. To many things with name almost the same.
There are
Is the development system for netduino cross platform?
Yes although not as strait forward as using Windows. A quote from one of the
Netduino developers says:
While we work out MonoDevelop IDE integration, we've created a Netduino C#
bootloader which will allow you to
manually compile your C#
Hi
Very cool. How much power can you run through the device? Put another way, if
you drive it with +13 dbm do all the numbers get 5 db better?
I doubt very many of us will be worrying about weather it's below -153 at 10 Hz
or not…
Bob
On Feb 28, 2012, at 5:42 AM, Bruce Griffiths wrote:
The authorized development platform is windows only. It will
run under wine. There is a linux/opensource platform in the
works based on mono. It is in pre alpha release.
In the opensource, linux world, mono is seen as an abomination
by many. Although mono has made it through the
About a year ago I built a Thunderbolt monitor using the Digilent Inc.
chipKIT Uno32 and a
4 x 20 display from Modern Device. The Digilent chipKIT is a 32-bit-
microcontroller
that is compatible with many Arduino code examples, and reference
materials and is pin
compatible with many
The Linear Technology LT3070 (150mV @ 5A) , LT3071, LT1580 , and
LT1581 (700 mV @ 10A) are examples:
http://www.linear.com/product/LT1580
For comparison:
http://www.linear.com/product/LT1584
The LT1580 (0.8V @ 7A) has the same topology as the LT1584 (1.5V @ 7A)
except everything but the pass
Hi
It's amazing how often the key element in any troubleshooting procedure is -
stop, put everything down, take a deep breath, get a cup of coffee, think
about it for a while. I've seen people go for weeks without executing this
very important step.
Bob
-Original Message-
From:
The raspberry pi linux ARM will be available RealSoon Now; about the
size of an Arduino and $35 US.
Don
Sam
Is the development system for netduino cross platform?
Yes although not as strait forward as using Windows. A quote from one of
the Netduino developers says:
While we work out
Oh yes the send button has a way of getting you to organize your thought
process.
Glad to hear bad wire though no idea how that actually happens.
Regards
Paul.
On Tue, Feb 28, 2012 at 12:14 PM, Bob Camp li...@rtty.us wrote:
Hi
It's amazing how often the key element in any troubleshooting
The datasheet indicates that an input of +13dBm should be OK albeit with
somewhat more 3rd harmonic distortion (~-65dBc) in the output.
I'll unearth the prototype single transistor (2N5943) transformer
feedback discrete buffer and use it to boost the signal before the splitter.
I'll also measure
Just a FYI, some op amps have lower distortion in inverting mode than as
a follower. This is not intuitively obvious since a follow has maximum
feedback, which would imply the best linearity. However the distortion
as a follower is due to the common mode rejection of the op amp. That is
the
Discrete amplifiers are always less noisy than integrated amplifiers.
If you want really low noise design a one with JFETs and Bipolar transistors.
I am trying to understand the contribution to phase noise by the opamps.
Perhaps the threshold is shifting and amplifier is being driven to
A lower limit to the phase noise floor of an opamp can be estimated from
its output noise and the output signal level.
Half of the output noise power contributes to PM, the other half to AM.
At low offsets modulation of internal capacitances by power supply noise
and opamp noise modulates the
I completely agree with you on this tactic. I started my working life as a
bench technician with Systron Donner testing new and customer instruments.
There would always be that odd dog unit that you couldn't fix. Hey ho, put
on one side for a couple of days and get on with the others. 99 times out
I'm ready to mount on of my 5680A in a case and looking for suggestions on
what one would consider a reasonable maximum case temp. Not being
a blood sucking cell provider, I can't replace a dead one every year.
Eventually I see locking the 5680A to GPS if that changes what one would
suggest.
On Tue, Feb 28, 2012 at 11:24 AM, Pete Lancashire
p...@petelancashire.com wrote:
I'm ready to mount on of my 5680A in a case and looking for suggestions on
what one would consider a reasonable maximum case temp. Not being
a blood sucking cell provider, I can't replace a dead one every year.
I
You need to look at the driving impedance before you declare one
technology quieter than another. That is, you have voltage noise and
current noise. For low driving impedance, bipolar will be quieter since
current noise will not be significant, plus a bipolar will have lower
thermal noise. For
From: Chris Albertson albertson.ch...@gmail.com
I'm ready to mount on of my 5680A in a case and looking for suggestions on
what one would consider a reasonable maximum case temp.
With the FE-5680A mounted to a 4x6x1 finned aluminum heatsink as shown here:
On 2/28/2012 1:09 PM, saidj...@aol.com wrote:
Hello troops,
been looking for a modern 8051 with low power standby (0.5mA) and an
internal RTC (hardware RTC).
Does anyone have any ideas?
Yes, I know there are other parts (PIC, AVR, ARM, etc etc etc), but I would
like to stay with the 8051.
Silicon labs might have what you are looking for:
http://www.silabs.com/products/mcu/lowpower/Pages/C8051F96x.aspx
-Eric
On Tue, Feb 28, 2012 at 1:09 PM, saidj...@aol.com wrote:
Hello troops,
been looking for a modern 8051 with low power standby (0.5mA) and an
internal RTC (hardware RTC).
Hi
I think the tradeoff of harmonics still better than -60dbc is fine if the
floor does indeed drop a few more db. For time nut applications, it's going
to be the phase noise close to carrier that matters. Harmonics with
reasonable terminations would not be the big issue.
It will be interesting
Hi Pete;
I saw a paper from on of the Blood Suckers that said the cooler the better,
and the effect of temp on life was huge. I looked on my computer and couldn't
find the paper again. I now think that data may have been in the hard copy of a
manual for one of the telecom shelves I have worked
At what frequency do you have 1 nv per square root Hz with opamp and
what opamp ?
The 1/f region is the killer and if it is a low frequency shift in the
input
effectively changing the threshold then you have to be concerned about the
1/f region.
Discrete embedded JFETs have the best 1/f
Hi
The data sheet is A bit easier to find at
http://www.interfet.com/datasheet/IF3601/
Bob
On Feb 28, 2012, at 6:06 PM, Bill Fuqua wlfuq...@uky.edu wrote:
At what frequency do you have 1 nv per square root Hz with opamp and
what opamp ?
The 1/f region is the killer and if it is a low
On 2/28/12 3:40 PM, Chuck Forsberg WA7KGX N2469R wrote:
Does this mean your GPS is safe? Who knows.
http://dailycaller.com/2012/02/28/lightsquared-ceo-resigns-amid-revelations-of-companys-proximity-to-obama-white-house/
well, L2 did just announce they're laying off half their staff (of some
Cool!
That part looks like it will do the job, thanks very much Eric.
On the I2C driver, I ported the NXP I2C library from 8051 to NXP ARM a
very long time ago, it was quite a bit of work to make it work properly. Lot's
of bugs I had to fix.. and could only do that with a Philips I2C
Bill wrote:
At what frequency do you have 1 nv per square root Hz with opamp and
what opamp ?
With most op-amps suitable for a 10 MHz distribution amp, the input
voltage noise is specified at 100 kHz or greater. For example, the
OPA653 that Bruce tested is specified for 6.1 nV/rtHz
That is a good part, but generally for higher frequency circuita, the
BF862 is used.
http://www.nxp.com/documents/data_sheet/BF862.pdf
Note the lower capacitance. Noise is higher, but you can parallel the
devices. They are quite cheap since it is a common part.
You will note LTC plops them
I've finally got around to taking a look at the two $50 5370B I got last winter.
One is missing the power supply control board.
The other said board is an old version -60006 instead of -60081, and
it's -15V is dead.
Add to that someone who should never be allowed to use a soldering
iron has had
Yes, there will be no set rule. You would need to try both inverting and
not inverting for each op amp.
On 2/28/2012 10:22 PM, Bruce Griffiths wrote:
For the OPA653 the noninverting configuration has lower distortion at
least for 2V pp outputs.
Bruce
gary wrote:
Just a FYI, some op amps
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