PRC as a amplifier in GPS question.

"Andy, The Real" <ihatehifitrolls@yahoo.com.au> wrote
What's the difference between a balanced and an unbalanced audio input?

I have heard of microphones that have an output which is out of phase
with
the main output. Is that the same thing?





** See http://www.sweetwater.com/insync/word.php?find=balanced


Use Google in future to find out what stuff means.
Having a bad day Phil??


*** I didn't notice you replying to the OP,were you having a bad day?
Brian
Goldsmith.
 
Hi Don

As mentioned in the discussion on this when the programmer came out, a
design involving a single micro and little else would need heaps of
I/O lines (probably in the vicinity of 40 or so) - or an ordinary
amount of I/O and a pile of latches/buffers.

How are the USB interface prices looking now? I haven't checked
recently.

Cheers
Glenn

Don McKenzie <support2003**NOSPAM**@dontronics.com> wrote:

PJ wrote:

What chips can it program? PIC16F84? AT90S8535?

No, it is only for Eproms.

I feel there are no Eprom programmer designs around today that are
really up to date.

A current one should be USB driven and powered, a single micro with
plenty of I/O, a ZIF socket, and not a lot more. A bit of voltage
doubling/regulation and switching circuitry.

--
Don McKenzie E-mail: http://www.dontronics.com/e-mail.html
Home Page: http://www.dontronics.com

Add USB to your favorite Micro. http://www.dontronics.com/dlp.html
The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software
 
On Wed, 25 Jun 2003, Andy, The Real wrote:

Unlike farnell, allison never makes mistakes...
I'm sure he thought he did once, but of course he was mistaken.

-- Dave
 
"Phil" <haxby@removethisbitandjustleave dodo.com.au> wrote in message
news:3ef8482a@news.comindico.com.au...
What's the difference between a balanced and an unbalanced audio input?

I have heard of microphones that have an output which is out of phase with
the main output. Is that the same thing?

Cheers,
Phil
Unbalanced audio lines use earth as one leg of the audio-pair. As long as
the run is short, and no earth loops develop ( a condition where local earth
and the remote earth have different absolute potentials to true earth) this
is an acceptable way of transmitting audio. Unbalanced shielded cable is
used here.

Balanced lines have both legs equi-voltage above earth. This is the
preferred way over long lines. Balanced feed is resistant to magnetic fields
as both legs pickup simultaneously thus producing no resultant difference in
voltage between the two wires/legs.

The only reference to phase I'm famiar with re: mikes, is the anti-phase
noise suppresion feature on some mikes. This takes the form of an aperture
which when opened allows the diaphragm to pick-up room sound on both of it's
sides. The reasoning being noise is omni-present and will cancel, while
desired audio is directional and will not.

Jason
 
"Craig Rodgers" <craig@student.usyd.edu.au> wrote in
news:bdcak4$fc$1@spacebar.ucc.usyd.edu.au:

I'm trying to provide network capabilities for an 8 bit micro
(AVRmega128) and was wondering what sort Ethernet controllers people had
used?



At the moment the controller I'm looking at using is the RTL8019AS (the
one with the onboard ram) made by realtek, it was designed for the ISA
bus and delivers 10Mbs. Ideally I was looking for a controller that can
deliver 100Mbs, but I can only find controllers designed for the PCI Bus
Well if you can switch cores, there's:

http://www.microcontroller.com/news/dallas_8051_ethernet.asp

Or if not, why didn't you like:

http://www.smsc.com/main/catalog/lan91c111.html

--
- Mark ->
--
 
Since the ATMega128 can't handle100mbps (ISA bus is too slow) isn't the
issue is moot?

"Craig Rodgers" <craig@student.usyd.edu.au> wrote in message
news:bdcak4$fc$1@spacebar.ucc.usyd.edu.au...
I'm trying to provide network capabilities for an 8 bit micro (AVRmega128)
and was wondering what sort Ethernet controllers people had used?



At the moment the controller I'm looking at using is the RTL8019AS (the
one
with the onboard ram) made by realtek, it was designed for the ISA bus and
delivers 10Mbs. Ideally I was looking for a controller that can deliver
100Mbs, but I can only find controllers designed for the PCI Bus,
something
I'm not game to try and drive with an 8 bit micro.



Has anyone come across an ethernet controller that is relatively easy to
interface with a microcontroller? Has anyone had any experience with the
8019?



Regards



Craig Rodgers
 
"Brett" <custserv@forums.ws> wrote in
news:bdcbjd$r4920$1@ID-184277.news.dfncis.de:

I'm trying to provide network capabilities for an 8 bit micro
(AVRmega128) and was wondering what sort Ethernet controllers people
had used?

At the moment the controller I'm looking at using is the RTL8019AS (the
one
with the onboard ram) made by realtek, it was designed for the ISA bus
and delivers 10Mbs. Ideally I was looking for a controller that can
deliver 100Mbs, but I can only find controllers designed for the PCI
Bus,
something
I'm not game to try and drive with an 8 bit micro.

Has anyone come across an ethernet controller that is relatively easy
to interface with a microcontroller? Has anyone had any experience
with the 8019?
[top post fixed]

Since the ATMega128 can't handle100mbps (ISA bus is too slow) isn't the
issue is moot?
Line rate and the CPU/bus's ability to handle this speed are not
intertwined. If the 100Mbit controller can buffer a full frame at 100Mbs
then it gives the CPU the ability to accept 100Mbs frames. Whether the CPU
and bus can keep up with large amounts of these frames is another issue. I
suspect that this design requires high line rate speed but not high data
rates. Kind of like running a serial at 115kBaud but only sending a couple
of characters per "long" unit of time.

--
- Mark ->
--
 
Has anyone come across an ethernet controller that is relatively easy to
interface with a microcontroller? Has anyone had any experience with the
8019?
Craig

The RTL8019 AS is 5 V only making it not the ideal candidate if you
have a 3.3V CPU. Another option is the Cyrrus logic cs8900a which is
also just 10Mb but available in a 3.3V variant. There is a 100MB chip
with ISA interface available from SMSC. The partnumber is something
like 9xxxx. You should easily find it if you browse their pages.

HTH

Markus
 
"Mark A. Odell" <nospam@embeddedfw.com> wrote in message
news:Xns93A56A7E318E8lkj562ghjgk1k245lbvj@130.133.1.4...
"Craig Rodgers" <craig@student.usyd.edu.au> wrote in
news:bdcak4$fc$1@spacebar.ucc.usyd.edu.au:

I'm trying to provide network capabilities for an 8 bit micro
(AVRmega128) and was wondering what sort Ethernet controllers people had
used?



At the moment the controller I'm looking at using is the RTL8019AS (the
one with the onboard ram) made by realtek, it was designed for the ISA
bus and delivers 10Mbs. Ideally I was looking for a controller that can
deliver 100Mbs, but I can only find controllers designed for the PCI Bus

Well if you can switch cores, there's:

http://www.microcontroller.com/news/dallas_8051_ethernet.asp

Or if not, why didn't you like:

http://www.smsc.com/main/catalog/lan91c111.html
For 10BASE-T, the SMSC LAN91C96 is a simpler and lower power alternative to
LAN91C111.

Tauno Voipio
tauno voipio @ iki fi
 
There is a device out there that embeds a complete 10/100 interface,
including a '186 micro, all the stacks etc into the Ethernet connector
socket. Around AUS$75, probably around US$35. pricey, but simple, and
very elegant.

the ad was in aaa local trade paper, I don't have that issue, but if you
still need it I'll post it back. I think Circuit cellar ran an article
using the same part in the last 2-3 months.

Al

Craig Rodgers wrote:
I'm trying to provide network capabilities for an 8 bit micro (AVRmega128)
and was wondering what sort Ethernet controllers people had used?

At the moment the controller I'm looking at using is the RTL8019AS (the one
with the onboard ram) made by realtek, it was designed for the ISA bus and
delivers 10Mbs. Ideally I was looking for a controller that can deliver
100Mbs, but I can only find controllers designed for the PCI Bus, something
I'm not game to try and drive with an 8 bit micro.

Has anyone come across an ethernet controller that is relatively easy to
interface with a microcontroller? Has anyone had any experience with the
8019?

Regards

Craig Rodgers
 
There is a 3.3V and 5V version of the MCU he's using.

I was looking at SMSC, however the bus looks like it's 16 bits data... is
there an 8bit mode?

"Markus Zingg" <m.zingg@nct.ch> wrote in message
news:ftcjfv4nlkrbe6omj13qktts12tp8doskn@4ax.com...
Has anyone come across an ethernet controller that is relatively easy to
interface with a microcontroller? Has anyone had any experience with the
8019?

Craig

The RTL8019 AS is 5 V only making it not the ideal candidate if you
have a 3.3V CPU. Another option is the Cyrrus logic cs8900a which is
also just 10Mb but available in a 3.3V variant. There is a 100MB chip
with ISA interface available from SMSC. The partnumber is something
like 9xxxx. You should easily find it if you browse their pages.

HTH

Markus
 
In comp.arch.embedded Mark A. Odell <nospam@embeddedfw.com> wrote:
"Brett" <custserv@forums.ws> wrote in
news:bdcbjd$r4920$1@ID-184277.news.dfncis.de:

Since the ATMega128 can't handle100mbps (ISA bus is too slow) isn't the
issue is moot?

Line rate and the CPU/bus's ability to handle this speed are not
intertwined.
[...]

I would dare say they are, at least as far as dedicated point-to-point
lines are considered. Having a high-speed capable line sit unused for
the majority of the time is bound to be wasting some (costly) resource
somewhere.

Shared-medium networks would be a different issue, obviously, but I
don't quite see what could be the benefit of having that buffer to
hold one complete Ethernet frame's worth of data on the embedded
device's end of that line, instead of at the hub, switch or whatever
is on the other end, where it'd usually be quite a bit easier to
accomodate it.

The only thing that would really be improved by such a plan would be
the latency, not the bandwidth. Sending shorter packets might be a
better plan, in that case.

--
Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de)
Even if all the snow were burnt, ashes would remain.
 
Hi Craig,

If you want Rapid TCP/IP connectivity in a Micro/Module.

You may want to look at the IPsil module
http://www.ipsil.com/products/d8930.htm

Full HTTP v1.0 compliant embedded webserver
Eight general purpose I/O pins, software-configurable as input or output
Modbus TCP support
10BaseT PHY/MAC support
Support DHCP or fixed IP addressing
Secure mode available requiring password for all access
512KB non-volatile memory available for storage of web objects (over 480KB
available for developer use)
Low cost/high performance

I think Adilam Elelctronics has them in stock

JG


"Craig Rodgers" <craig@student.usyd.edu.au> wrote in message
news:bdcak4$fc$1@spacebar.ucc.usyd.edu.au...
I'm trying to provide network capabilities for an 8 bit micro (AVRmega128)
and was wondering what sort Ethernet controllers people had used?



At the moment the controller I'm looking at using is the RTL8019AS (the
one
with the onboard ram) made by realtek, it was designed for the ISA bus and
delivers 10Mbs. Ideally I was looking for a controller that can deliver
100Mbs, but I can only find controllers designed for the PCI Bus,
something
I'm not game to try and drive with an 8 bit micro.



Has anyone come across an ethernet controller that is relatively easy to
interface with a microcontroller? Has anyone had any experience with the
8019?



Regards



Craig Rodgers
 
Brett wrote:
Since the ATMega128 can't handle100mbps (ISA bus is too slow) isn't the
issue is moot?
You forget the suits.

Being able to put "100 MBit/s capable" into the glossy feature sheet may
be a sales advantage. Even though it doesn't make much sense
technically...


--
Olav Wölfelschneider usenet03q02@wosch.teratronik.com
 
Well if you can switch cores, there's:

http://www.microcontroller.com/news/dallas_8051_ethernet.asp

Or if not, why didn't you like:

http://www.smsc.com/main/catalog/lan91c111.html

--
- Mark -
--
at this stage I'd rather not switch cores simple because i don't have the
development tools to play with the 8051 you've sugested, although it does
look like a very attractive micro.

Do you have any idea who distributes the LAN91C111 in Australia?

Regards
Craig
 
"Craig Rodgers" <craig@student.usyd.edu.au> wrote in message
news:bdchsa$4be$1@spacebar.ucc.usyd.edu.au...
Well if you can switch cores, there's:

http://www.microcontroller.com/news/dallas_8051_ethernet.asp

Or if not, why didn't you like:

http://www.smsc.com/main/catalog/lan91c111.html

--
- Mark -
--

at this stage I'd rather not switch cores simple because i don't have the
development tools to play with the 8051 you've sugested, although it does
look like a very attractive micro.

Do you have any idea who distributes the LAN91C111 in Australia?
You have to build a byte cross-over buffer between the 8051 and 91C111 to
bridge the bus-width gap. LAN91C111 does not support 8 bit bus.

Think twice if 100 Mbit/s is really needed - for a 8051 even 10 Mbit/s is an
overkill.

Tauno Voipio
tauno voipio @ iki fi
 
Hans-Bernhard Broeker wrote:
In comp.arch.embedded Mark A. Odell <nospam@embeddedfw.com> wrote:
"Brett" <custserv@forums.ws> wrote in
news:bdcbjd$r4920$1@ID-184277.news.dfncis.de:

Since the ATMega128 can't handle100mbps (ISA bus is too slow) isn't the
issue is moot?

Line rate and the CPU/bus's ability to handle this speed are not
intertwined.
[...]

I would dare say they are, at least as far as dedicated point-to-point
lines are considered. Having a high-speed capable line sit unused for
the majority of the time is bound to be wasting some (costly) resource
somewhere.
And how exactly will a point to point environment be improved by
changing the ethernet from 100 Mbps to 10 Mbps? What costly resource
does 100 Mbps Ethernet have that a 10 Mbps Ethernet does not have?


Shared-medium networks would be a different issue, obviously, but I
don't quite see what could be the benefit of having that buffer to
hold one complete Ethernet frame's worth of data on the embedded
device's end of that line, instead of at the hub, switch or whatever
is on the other end, where it'd usually be quite a bit easier to
accomodate it.
Yes, I can see that you don't understand. If you do all the math, you
will find that data going to the embedded target can travel at the full
rate and reach the target in less time. So the target can start working
on the data sooner. Likewise data being sent by the embedded target
will take less time if it travels at the higher rate freeing up the
buffer more quickly.


The only thing that would really be improved by such a plan would be
the latency, not the bandwidth. Sending shorter packets might be a
better plan, in that case.
Shorter packets may make some number smaller that is reported by
software and you are equating with latency. But the real latency does
not change, and in fact may get worse. No one cares how quickly a part
of a buffer is sent. If the entire buffer needs to be sent before
processing can begin, breaking it into smaller packets buys you
nothing.

--

Rick "rickman" Collins

rick.collins@XYarius.com
Ignore the reply address. To email me use the above address with the XY
removed.

Arius - A Signal Processing Solutions Company
Specializing in DSP and FPGA design URL http://www.arius.com
4 King Ave 301-682-7772 Voice
Frederick, MD 21701-3110 301-682-7666 FAX
 
Craig Rodgers wrote:

Has anyone come across an ethernet controller that is relatively easy to
interface with a microcontroller?
Projec Systems ETHERNET Controlled Web Server at:
http://www.dontronics.com/projecsystems.html
may be of interest.

--
Don McKenzie E-mail: http://www.dontronics.com/e-mail.html
Home Page: http://www.dontronics.com

Add USB to your favorite Micro. http://www.dontronics.com/dlp.html
The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software
 
"Dave Horsfall" <daveh@ci.com.au> wrote in message
news:20030625231246.G16682@mippet.ci.com.au...
On Wed, 25 Jun 2003, Phil Allison wrote:

** You insult me for fun - I tell the NG the facts about you.
The deal is that simple.

Rule #2 is that Allison will always try and have the last word, even unto
fantasising where necessary. <pavlov> It's also followed by abuse, as
you'll see </pavlov>.

** Calling you a horse's arse is an insult to horses.

BTW That killfile of yours it not working.


.............. Phil
 
I am looking for some information on wireless lan interfacing to micro
controllers, other than PC PCI or PCMCIA cards, is there any easy off
the shelf product, i am thinking of wireless access point and micro
controller with 10 base T interface.
I've no idea how much they cost, but these guys make embedded java
microcontrollers with built in ethernet:
http://www.ibutton.com/TINI/index.html

They have a complete solution on a board here:
http://www.ibutton.com/TINI/hardware/index.html
at the fairly reasonable cost of $50 (click on the sales and marketing link
to buy one). Although it seems there's an 8-12 week wait t get hold of one.

Ewan
 

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