Chip with simple program for Toy

[Ant_Magma]

I'm building a powerline modem using Belfuse's powerline module:
http://belfuse.com/Data/DBObject/0804-5000-03-04.pdf

I've requested for reference design and they say no reference design
are available.

My question:
I have realized with the reference design of my ethernet transceiver
that most of the pins (unless specifically stated) have a 50ohm
resistor (i'm assuming its a terminating resistor?).

Since without a reference design, i'm guessing i just connect the pins
of the powerline module directly to the corresponding pins at my
ethernet transceiver. My question is, do i have to place any resistors
btwn these connections too? Is there like a conventional rule of thumb
etc when dealing with these kind of situations?

 

[News]

This is my favourite website.
It have a complete RS232 information, and is easy to read.
http://www.beyondlogic.org/serial/serial.htm

Enjoy.


Best Regards,
Lim Siong Boon

siongboon@yahoo.com.sg
www.siongboon.com



"Rich Grise" <richgrise@example.net> wrote in message
newsan.2006.03.08.16.08.55.763888@example.net...

On Wed, 08 Mar 2006 05:27:41 -0800, Steven P wrote:

maybe a stupid question.

The only stupid question is the one you don't ask.

But I've set followups to sci.electronics.basics, since this is a basics
question.

I know rs232 data flow normally consists of 1 Start bit, 8 Data bits, 1
Stop Bits and 1 Check bits for a Byte data.

Can someone tell me whether this Start Bit is high or low, and stop
bit? If this depends on the hardware implementation, then please give
me the answer under the condition of using PC and windows.

Maybe some of these links could be helpful:
http://www.google.com/search?q=rs-232+specification
http://www.google.com/search?q=rs232+specification

Cheers!
Rich

 

[Ken Smith]

In article <1142355408.401263.318940@i39g2000cwa.googlegroups.com>,
<pmlonline@gmail.com> wrote:
[....]

The input coil is 3.5" dia., 3.5" tall, 1000 turns of 24G, 23 ohms. I
calculate 60mH and guessing at about 8000 pF.

Since everyone else is talking about the signal, I'll ask a question about
the "noise". Is it really random or is it mostly harmonics of the local
mains frequency?

If it is harmonics of the mains, you can help things a lot by timing the
experiment such that it slides over one cycle of the mains in every N
samples and then averaging N samples together. This tends to reject the
low harmonics of the mains.

For the mains frequency its self, you could also add a notch filter to
remove it before the ADC.




--
--
kensmith@rahul.net forging knowledge

 

[Keith Williams]

In article <7_TRf.919$oj5.336233@news.siol.net>,
Sio_spam_L@same.net says...

"Frank Bemelman" <f.bemelmanq@xs4all.invalid.nl> wrote in message news:4416e76f$0$2630$e4fe514c@dreader25.news.xs4all.nl...

The next question would be "how many insertion cycles" do you need
I believe ~1um is standard and probably what you get no matter what
you order But why don't you ask Eurocircuits?

Thanks, Frank.
(remove 'q' and '.invalid' when replying by email)

From the pci spec (thanks Keith) it seems like 1 micron should cover it.
http://www.pcisig.com/specifications/conventional/ECN_PCI_Connector_Finish.pdf

I downloaded the spec to understand this better. The spec doesn't
really address the card edge tabs (at least it's hidden if it
does), rather the connector itself. An alternate finish in the 2.3
spec is a gold flash over 1u palladium or palladium-nickel. This
might be cheaper for the tabs too.

BTW, to answer the insertion cycles question, the spec calls for
100 mating cycles "without physical damage".

I sent them my board in p-cad and am now waiting for a quote,
I'll probably have to connect all PCI pins together for their electro-plating process to
work. So far it sounds like gold might add some 25-35% to the total cost of the board.
We'll see.

Wow! I did a PCI card (can't remember the PCI tabs specifically)
with some hard gold for a BGA connector and it didn't add anything
like that to the cost. Maybe the base cost was so much higher that
I really didn't care what the gold added.

--
Keith

 

[Robert Obermayer]

Winfield Hill wrote:

Thanks for that fine diagram. Before seeing your details I was
speculating that you were using higher-voltage MOSFETs, which
have a nasty tendency to RF oscillation when biased for linear
operation with Vds more than 10V (the oscillation is internal to
the MOSFET and often cannot be stopped even with a gate-source
bypass capacitor.
Sounds interesting, since im also working at a highish-power active

load.My specs so far are 50v/50A/350w (with at least 40A at 1v being
possible).Cooling via 150mm long fisher electronic SK06 (.5k/w) with 2
90mm fans (hoped to be around .2k/w with fans at full noise level).
Not ideal but i have some of the SK06 sinks from a scrapped laser PSU
[with 4 dead 3055 on them, because of all these holes im going to use a
10mm alu heat spreader between FETs/sink].

I was planning to use 6 IRFP260N, each with its own control loop.
Now reading that high voltage (the 200v 260N is "high voltage?) FETs can
be problematic, im worried that i have to begin everything from scratch
again.
I built a smaller active load some year back with a 300v 350N and it was
stable (at least it looked so on my only scope back then, 10Mhz, now
theres a 50Mhz analog and a 20Mhz DSO) and it didnt blow yet, so maybe
it could work?

So what are your words on this, can it work or should i use something
else instead?
The 260N were promising because of their good Rth j-c /price ratio and
low enough Rds and high voltage margin for spikes of any origin.

Looks interesting, for the fact of using only one OP per FET.
My old plan involved 2 OPs each so thats much better (my control card
has to fit in the case vertically and the old one doesnt really do)
Now i seem to have a (hopefully) temproary brain blockage caused by a
math test i wrote today and dont really understand how it works, so some
hints might be good.
My app calls for 10A/FET at 5v control voltage (from a DAC), supply +-15v.

--
Robert

 

[Dorian McIntire]

Is there any way to know how many AMPs are comming out of a battery? Most
batteries purchased at the shops dont tell you.

This is like asking how much water comes out of a garden hose. The answer
is - as much as you want or need, up to a point. Two things determine how
much water will flow from the hose - the valve or faucet setting, hose
length and hose diameter (resistance) and the water pressure (voltage). As I
open the valve more water will flow (current) and if my water pressure
increases more water will flow.

Batteries usually show only the pressure (voltage) they provide because the
current delivered by the battery depends on the load or application. Battery
or cell types such as D, C, AA, etc are selected based on the current
requirements for a particular application.

NEVER measure current like you would measure volts. A current measurement
must always be done with the meter leads in series with the load. Meters
have a very low resistance on the current (A) setting, to minimize the
meters effect on the measurement. You can ruin a good meter by putting it on
the current (A) setting and putting it across a battery. At best you'll blow
a fuse.

Dorian

"Average Shmo" <totalharmonicdistortion@hotmail.com> wrote in message
news:121d74gb37rdv00@corp.supernews.com...

Hi,

Is there any way to know how many AMPs are comming out of a battery? Most
batteries purchased at the shops dont tell you.

I have a voltmeter here but that only (you guessed it) shows volts!

Thanks in advance.

 

[Frank Bemelman]

"SioL" <Sio_spam_L@same.net> schreef in bericht
news:7_TRf.919$oj5.336233@news.siol.net...

"Frank Bemelman" <f.bemelmanq@xs4all.invalid.nl> wrote in message
news:4416e76f$0$2630$e4fe514c@dreader25.news.xs4all.nl...

The next question would be "how many insertion cycles" do you need
I believe ~1um is standard and probably what you get no matter what
you order But why don't you ask Eurocircuits?

Thanks, Frank.
(remove 'q' and '.invalid' when replying by email)

From the pci spec (thanks Keith) it seems like 1 micron should cover it.

http://www.pcisig.com/specifications/conventional/ECN_PCI_Connector_Finish.pdf

I sent them my board in p-cad and am now waiting for a quote,
I'll probably have to connect all PCI pins together for their
electro-plating process to
work. So far it sounds like gold might add some 25-35% to the total cost
of the board.
We'll see.

They will probably do that (connecting pci pins) for you, if needed.
They always check a design against their own rules, and email a snapshot
indicating a possible problem, if they find weird stuff. I'm sure you
will get what you expect, without any hassles.

--
Thanks, Frank.
(remove 'q' and '.invalid' when replying by email)

 

[SioL]

"Keith Williams" <krw@att.bizzzz> wrote in message news:MPG.1e820ac32781249b989943@News.Individual.NET...

I sent them my board in p-cad and am now waiting for a quote,
I'll probably have to connect all PCI pins together for their electro-plating process to
work. So far it sounds like gold might add some 25-35% to the total cost of the board.
We'll see.

Wow! I did a PCI card (can't remember the PCI tabs specifically)
with some hard gold for a BGA connector and it didn't add anything
like that to the cost. Maybe the base cost was so much higher that
I really didn't care what the gold added.

Yep, currently it costs me 3-4 euro per board.


--
Siol
------------------------------------------------
Rather than a heartless beep
Or a rude error message,
See these simple words: "File not found."

 

[Tim Williams]

"andrew_h" <aheyn@heyntech.com.au> wrote in message
news:1142424736.341672.33580@u72g2000cwu.googlegroups.com...

Is there such thing ??? Is it really much different from a normal
electrolytic cap???

I was looking at some panasonic amps......is this just marketing
babble?
snip

In contrast to common plastic films such as mylar, polypropylene and such,
water has a very high dielectric constant, around 80, compared to 2-5 for
such typical dielectrics. (Ceramics of course reach into the thousands.)
The problem is, for the same reason water has a high dielectric constant, it
also tends to dissolve ions, making a conductive solution, defeating the
purpose of a capacitor in the first place! Even very pure water has some
resistivity, on the order of a semiconductor I suppose. (The figure "16.7
megaohms" comes to mind, but resistivity is ohms per length, not blind
ohms!!)

At any rate, capacitors are a hot subject among audiophools .. sorry ..
audiophiles. A good idea is to take anything said around audio, especially
"high quality" audio, with several grains of salt.

Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms

 

[Keith]

On Wed, 15 Mar 2006 19:45:29 +0100, SioL wrote:

"Keith Williams" <krw@att.bizzzz> wrote in message news:MPG.1e820ac32781249b989943@News.Individual.NET...

I sent them my board in p-cad and am now waiting for a quote,
I'll probably have to connect all PCI pins together for their electro-plating process to
work. So far it sounds like gold might add some 25-35% to the total cost of the board.
We'll see.

Wow! I did a PCI card (can't remember the PCI tabs specifically)
with some hard gold for a BGA connector and it didn't add anything
like that to the cost. Maybe the base cost was so much higher that
I really didn't care what the gold added.

Yep, currently it costs me 3-4 euro per board.

Ok, that now makes sense. My boards were in the couple of $hundred range
and the BGA sockets were $3K each. The gold was insignificant (though the
supplier had to jump through a few hoops to not pollute their process with
the Au).

--
Keith

 

[Bart]

"Bart" <bborb@fusedotnet> wrote in message
news:9efc9$44180237$d8442b3e$29105@FUSE.NET...

Hello members,
My son got this idea from Popular Science's March edition and asked me to
help him build it. He's got an expensive Ipod and as I was helping him
solder the components I was thinking "this is too simple". I don't know
enough about power supplies but I've heard terms such as "current
limiting" or "inrush" to worry about this damaging his expensive Ipod. It
says it can recharge the Ipod, or power it if the internal battery goes
low. Should I worry?
Here's one link of many about the "charger".

http://www.hackaday.com/entry/1234000270029372/

Any feedback is appreciated,
Bart


View in fixed font or courier

____
1| |3
+-----|7805|-------+
| |____| |
| |2 |
| | | ___ LED|
+-||----+|___|-->|-+
9V | | 160 |
| +--+
| |
| +----------+
| |1 usb 4 |
| +----------+
| |
+---------------+
(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)

I made this schematic to show the "charger" circuit. I'm still worried about
my son plugging it in to his expensive Ipod.

 

[Bart]

"Bart" <bborb@fusedotnet> wrote in message
news:5fb3c$4419921a$d8442d08$16344@FUSE.NET...

"Bart" <bborb@fusedotnet> wrote in message
news:9efc9$44180237$d8442b3e$29105@FUSE.NET...
Hello members,
My son got this idea from Popular Science's March edition and asked me to
help him build it. He's got an expensive Ipod and as I was helping him
solder the components I was thinking "this is too simple". I don't know
enough about power supplies but I've heard terms such as "current
limiting" or "inrush" to worry about this damaging his expensive Ipod. It
says it can recharge the Ipod, or power it if the internal battery goes
low. Should I worry?
Here's one link of many about the "charger".

http://www.hackaday.com/entry/1234000270029372/

Any feedback is appreciated,
Bart


View in fixed font or courier
____
1| |3
+-----|7805|-------+
| |____| |
| |2 |
| | | ___ LED|
+-||----+|___|-->|-+
9V | | 160 |
| +--+
| |
| +----------+
| |1 usb 4 |
| +----------+
| |
+---------------+
(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)

I made this schematic to show the "charger" circuit. I'm still worried
about my son plugging it in to his expensive Ipod.


I may have displayed the LED backwards, not sure. It's just to show that

current IS flowing from the +5volt side.

 

[Jan Wagner]

Hi,

Bart wrote:

"Bart" <bborb@fusedotnet> wrote in message
View in fixed font or courier
____
1| |3
+-----|7805|-------+
| |____| |
| |2 |
| | | ___ LED|
+-||----+|___|-->|-+
9V | | 160 |
| +--+
| |
| +----------+
| |1 usb 4 |
| +----------+
| |
+---------------+
(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)

Yup, the LED should be the other way round. But if you don't feel
comfortable building this then maybe it's better not to, right?

Should work as a power supply, though. Just be cautious with the USB
connector pin order and triple-check it.

The main problem with the circuit I guess would be that the LM7805 (use
TO-220 package version, LM7805CT) can heat up a lot, since something
between one third and one half of the battery power is dissipated in the
regulator. That's not very good for the 9V battery life either.

The 7805 has short circuit overcurrent protection, but no useful current
limiting here. Adding a ~4ohm 1W resistor in series with the 9V could
help to limit to around 500mA ("real" USB maximum), "just in case".

- Jan

 

[Jeff Dieterle]

It may be this distortion is there at all volume levels it's just not
detectable to my 55 year old factory abused hearing. I don't think this juke
is using a subwoofer as the speaker inputs got to discrete connections on
the output stage of the amp and the amp has a 5-6 transistors on each
channel mounted to a large fan cooled heat sink.

"Bob Masta" <NoSpam@daqarta.com> wrote in message
news:44181dfe.4854457@news.itd.umich.edu...

On Tue, 14 Mar 2006 13:11:11 -0500, "Jeff Dieterle"
jdieter@nospam.carlnet.org> wrote:

I have a cd jukebox and the amp has developed a distortion in both
channels.
It's more apparent in the base speakers and seems to go away as I increase
the volume. Would this be a problem in the power supply?


The power supply would normally be a good guess, since it affects both
channels. However, the typical problem of too low a positive or
negative (or both) supply would normally be expected to cause
clipping on outputs that tried to exceed that level. So it would
sound worse at high levels, not better. The problem you describe
sounds more like a description of crossover distortion, which is
a fixed amplitude step as the wave passes through zero, so
it's a smaller percentage of large signals.

I ownder if you actually have 2 separate bass channels.
Is it possible that the jukebox is using a subwoofer approach,
with a single bass channel for low frequencies? (They might
feed it to 2 separate speakers.) If that is the case, then
the distortion is in a single amp and there are many possible
causes. One typical casue of crossover distortion is
inadequate bias on the output stages, but you have to
be careful since too much will quickly cause thermal
runaway in many circuits, which will definitely let the smoke
out!

Best regards,




Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Home of DaqGen, the FREEWARE signal generator

 

[BobG]

Observation of the output signal on any old scope will instantly reveal
symmetry on the output or not.

 

[Rich Grise]

On Wed, 15 Mar 2006 14:35:46 -0600, Tim Williams wrote:

"andrew_h" <aheyn@heyntech.com.au> wrote in message
news:1142424736.341672.33580@u72g2000cwu.googlegroups.com...
Is there such thing ??? Is it really much different from a normal
electrolytic cap???

I was looking at some panasonic amps......is this just marketing
babble?
snip

In contrast to common plastic films such as mylar, polypropylene and such,
water has a very high dielectric constant, around 80, compared to 2-5 for
such typical dielectrics. (Ceramics of course reach into the thousands.)
The problem is, for the same reason water has a high dielectric constant, it
also tends to dissolve ions, making a conductive solution, defeating the
purpose of a capacitor in the first place! Even very pure water has some
resistivity, on the order of a semiconductor I suppose. (The figure "16.7
megaohms" comes to mind, but resistivity is ohms per length, not blind
ohms!!)

At any rate, capacitors are a hot subject among audiophools .. sorry ..
audiophiles. A good idea is to take anything said around audio, especially
"high quality" audio, with several grains of salt.

Tim

Especially when they get to stuff like the "Clear, pure water" resulting
in a more "transparent sound". Sheesh! ;-)

Cheers!
Rich

 

thanks,do u know it's circuits.....

 

[Nospam]

The message <0001HW.C0419827018E2F8FF04075B0@news.readfreenews.net>
from DaveC <me@privacy.net> contains these words:

I'm modifying a 14.4v flashlight to use an array of LEDs. The voltage
of the
white LEDs is 4.0v, and total draw is 0.145mA (measured).

This means dropping 10.4 volts, which means using a 72 ohm resistor (180 &
120 in parallel). This resistance evaporates 6-plus watts which is valuable
battery power turned into useless heat.

Would using a small voltage regulator in stead of resistors waste less
power?
How does one determine the comparative power consumption figures for
regulators?

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group

Try looking at http://www.romanblack.com/smps.htm

This may get rid of your losses

Pete

 

[Joseph2k]

mensanator@aol.com wrote:

dhrm77 wrote:
mensanator@aol.com> wrote in message
news:1141853415.590283.140210@z34g2000cwc.googlegroups.com...
Rich Grise wrote:
On Wed, 08 Mar 2006 09:09:23 +0000, Simon Tatham wrote:
Rich Grise <richgrise@example.net> wrote:
"Two inverter logic gates puzzle?" I haven't heard of it.

It's a problem in digital electronics. The challenge is to design a
logic circuit which takes three inputs A,B,C, and outputs their
inversions ~A,~B,~C; the restriction is that although you may use
as many AND and OR gates as you like, you're allowed only two NOT
gates.

(And - of course - no NANDs, NORs, XOR with 1 or anything cheating
like that. Two straight NOT gates are the only non-increasing
functions you may use.)

Kewl! I've crossposted this, because I bet some electronic geek will
solve it in minutes! ;-)

So far, I have no clue, but I'm ass-u-me-ing that DeMorgan's theorem
fits in there somewhere.

Electronics guys: When you solve this, leave spoiler space, OK?

Well, electronic guys would NEVER solve this using the solution
Ed Murphy posted...
.
.
.
.
because...
.
.
.
.
just...
.
.
.
.
like...
.
.
.
.
spoiler...
.
.
.
.
space,...
.
.
.
.
that...
.
.
.
.
solution...
.
.
.
.
creates...
.
.
.
.
excessive propagation delay. 9 gates worth!

n1 gets ANDed with a 4-gate delayed version of itself.
We're talking serious glitches here. And take it from someone
who has solved such problems in real circuits, propagation
delay glitches are NO fun to track down.

The electronics guy would simply glue a 7404 to the board
on its back, leads in the air and wire it in using wire wrap wire.

The electronic guy from the 70's perhaps...

Today he would probably use a 74VHC04 or 74ALS04 or similar
and the 1ns delay with those guys aren't that bad !

And in the 70's, we didn't have circuits operating at GHz clock
rates. Let's see, 1 ns is 0.000000001 sec which corresponds
to a clock cycle of ONLY 1 GHz. Sounds like I'm not the only
one stuck in the past.

And even in the 70's, a 1 ns glitch could cause havoc if
connected to an edge triggered flip-flop input such as the clock
or reset. In fact, for the particular case I had in mind, the glitch
was less than 1 ns. It was in every circuit (due to foolish logic
design) and only worked at all because the glitch never quite
made it to the logic threshold. Unless one of the gates involved
was a little bit slower than average. And even then, it would
only create a problem when doing hardware division on 14-digit
operands. That one was a lot of fun.

And rather than fixing the circuit, they hired a consultant to
write a comprehensive diagnostic program to test just about
every possible combination of operand patterns and lengths
so that the out of spec chips could be spotted.


;-)


Thanks!
Rich


Finagle! Sounds like a classic case of marginal design resulting in

problems that are management solved by stupendously nitpicky enforcement of
procurement contracts; in order to comply with the company's (frozen
design) contract. Right out of the old cost plus days.
--
JosephKK
Gegen dummheit kampfen die Gotter Selbst, vergebens.
--Schiller

 

[massoumi_85@hotmail.com]

Thanks ray13 - will try it outr asap.