Chip with simple program for Toy

[Rich Grise]

On Mon, 14 Jul 2008 18:35:12 -0500, Kris Krieger wrote:

If a circuit just calls for something like a 1 Ohm resistor, with no other
info, would it be bad to use a Current Sensing resistor there?

Not at all - that's exactly how it's done.

What would be the best way to approach looking up one to get, when no
other info is oprovided at to type or brand?

Well, one ohm gives you one volt per amp, so it has to dissipate V * I
watts - if you're sensing 5 amps, which is 5v across a 1 ohm resistor,
that's 25 watts!

And, the precision of your measurement will depend on the precision
of the resistor.

Good Luck!
Rich

 

[qrk]

On Mon, 14 Jul 2008 18:35:12 -0500, Kris Krieger <me@dowmuff.in>
wrote:

If a circuit just calls for something like a 1 Ohm resistor, with no other
info, would it be bad to use a Current Sensing resistor there?

What would be the best way to approach looking up one to get, when no other
info is oprovided at to type or brand?

TIA!

- Kris

You need to know what sort of current will be passing thru the
resistor. From there, you can determine the power rating of the
resistor. It's overkill (size, cost) to use a 100W resistor if you
only need a 0.1W rated unit.

--
Mark

 

[Ken S. Tucker]

On Jul 15, 10:20 am, qrk <SpamT...@spam.net> wrote:

On Mon, 14 Jul 2008 18:35:12 -0500, Kris Krieger <m...@dowmuff.in
wrote:

If a circuit just calls for something like a 1 Ohm resistor, with no other
info, would it be bad to use a Current Sensing resistor there?

What would be the best way to approach looking up one to get, when no other
info is oprovided at to type or brand?

TIA!

- Kris

You need to know what sort of current will be passing thru the
resistor. From there, you can determine the power rating of the
resistor. It's overkill (size, cost) to use a 100W resistor if you
only need a 0.1W rated unit.
Mark

I had the pleasure of servicing an electrically powered
boat out in the boonies of Muskoka.
I needed to measure the current draw from car batteries,
so I cut a bunch of stove wire to short lengths and
crimped them together with good terminals at each
end to make a high watt .1 or .01 resistor, it worked
well.
The problem is to solve for a 100 amp draw without
too much of a voltage drop, so a 0.01 ohm scoffs
1V, and 100W. Anyway, it's fairly easy to make a
short length of Nichrome wire cable, economically.
Ken

 

[Eeyore]

Lord Garth wrote:

John,

I've noticed that alt.binaries.schematics.electronic is now missing
from my news server. Apparently replaced by
free.binaries.schematics.electronic ... what has happened over the
last week?

American censorship. You know - free country and all that. Look up NYAG
+ Usenet.

Graham

 

[John Fields]

On Tue, 15 Jul 2008 23:13:10 +0100, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

Lord Garth wrote:

John,

I've noticed that alt.binaries.schematics.electronic is now missing
from my news server. Apparently replaced by
free.binaries.schematics.electronic ... what has happened over the
last week?

American censorship. You know - free country and all that. Look up NYAG
+ Usenet.

---
Here's what I found:

http://news.cnet.com/8301-13578_3-9964895-38.html

Note that a _Federal_ judge overturned the Pennsylvania State law for
being in violation of the first amendment of the US Constitution for
several reasons, so that's censorship overturned and a somewhat freer
environment restored.

Much like Larry Flynt's trip to the US Supreme Court which allowed him
to freely publish porn after lots of porn Nazis tried to shut him
up/down because of their own inhibitions and feelings of religious
guilt.

After all, if they didn't want to view or buy Flynt's stuff they
should have just left it alone, individually, and saved their own
souls instead of trying to shut him up/down, "for the good of all of
mankind." ,thinking that everyone else's souls were their business to
save by trying to erect legislation designed to curtail Flynt's
actions.

Hooray for the US Supreme Court's decision, don't you agree?

I often think that if a potential sexual predator gets himself/herself
off by masturbating to what they find on USENET or on the Internet
then that's well worth the alternative which might occur if that porn
wasn't there.

Cuomo's position, as a Roman Catholic, is interesting in that it would
cut off that avenue of expression and _require_ celibacy even though
celibacy might not be a real option.

So much for politicians...

JF

 

[Don Bowey]

On 7/15/08 7:13 PM, in article ae9q74d9fuadh8162pd4rhqdn4hot53btu@4ax.com,
"John Fields" <jfields@austininstruments.com> wrote:

On Tue, 15 Jul 2008 23:13:10 +0100, Eeyore
rabbitsfriendsandrelations@hotmail.com> wrote:



Lord Garth wrote:

John,

I've noticed that alt.binaries.schematics.electronic is now missing
from my news server. Apparently replaced by
free.binaries.schematics.electronic ... what has happened over the
last week?

American censorship. You know - free country and all that. Look up NYAG
+ Usenet.

---
Here's what I found:

http://news.cnet.com/8301-13578_3-9964895-38.html

Note that a _Federal_ judge overturned the Pennsylvania State law for
being in violation of the first amendment of the US Constitution for
several reasons, so that's censorship overturned and a somewhat freer
environment restored.

Much like Larry Flynt's trip to the US Supreme Court which allowed him
to freely publish porn after lots of porn Nazis tried to shut him
up/down because of their own inhibitions and feelings of religious
guilt.

After all, if they didn't want to view or buy Flynt's stuff they
should have just left it alone, individually, and saved their own
souls instead of trying to shut him up/down, "for the good of all of
mankind." ,thinking that everyone else's souls were their business to
save by trying to erect legislation designed to curtail Flynt's
actions.

Hooray for the US Supreme Court's decision, don't you agree?

I do.

I often think that if a potential sexual predator gets himself/herself
off by masturbating to what they find on USENET or on the Internet
then that's well worth the alternative which might occur if that porn
wasn't there.

Cuomo's position, as a Roman Catholic, is interesting in that it would
cut off that avenue of expression and _require_ celibacy even though
celibacy might not be a real option.

So much for politicians...

JF

 

[Don Bowey]

On 7/15/08 2:40 PM, in article RO8fk.32605$ZE5.5193@nlpi061.nbdc.sbc.com,
"Lord Garth" <lgarth@tantalus.net> wrote:

John,

I've noticed that alt.binaries.schematics.electronic is now missing
from my news server. Apparently replaced by
free.binaries.schematics.electronic ... what has happened over the
last week?

Comcast still has a.b.s.e., but does not list f.b.s.e.

I found f.b.boobs, however.

 

[sal2]

On Tue, 15 Jul 2008 10:36:26 +0100, Eeyore wrote:

sal2 wrote:

Eeyore wrote:
simplesal wrote:

I’m looking for away to amplify the audio signal coming from my
computer sound cards output.
I’m trying to amplify the output voltage to 31 volts

31 volts rms, peak or peak to peak. It makes a big difference.

output voltage 27 Volts to 31 Volts (from 54 Volts Peak-Peak, to 62
Volts Peak-Peak). and Output Current at : 1.0to 1.5 milliamps

Where did 27 come from now ? A range of 27-31V ?

You should answer questions directly not introduce new variables.

Let me ask again in this way. What is the absolute maximum peak-to-peak
voltage you require across your ultimate load ? The mA almost doesn't
matter, so don't bother with that.

Graham

62 Volts
Peak-Peak

 

[xxx]

Michael A. Terrell wrote:

Roger_the_Codger wrote:

I would have just bought my own software.

There is plenty of free stuff and paid for packages.

There is often something on ebay for a few pounds.



A few pounds of what?

Sterling grade refined purified silver, M8.

 

[Michael A. Terrell]

xxx wrote:

Michael A. Terrell wrote:
Roger_the_Codger wrote:

I would have just bought my own software.

There is plenty of free stuff and paid for packages.

There is often something on ebay for a few pounds.



A few pounds of what?



Sterling grade refined purified silver, M8.

Isn't that kind of hard to mail?


--
http://improve-usenet.org/index.html

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm

Sporadic E is the Earth's aluminum foil beanie for the 'global warming'
sheep.

 

[The Phantom]

On Fri, 18 Jul 2008 08:39:18 +1000, "Phil Allison" <philallison@tpg.com.au>
wrote:

"The Phantom"


For example, for the 24 volt, 8 amp transformer I've mentioned in this
thread,

** An incorrectly rated example.

Plucked out of his arse.


The
recommendation that John Fields made, to assume Irms/Idc = 2, which he
says will
always be safe, may not be safe if you are using a transformer with good
regulation and if your grid waveform is a good sinusoid.


** A transformer with unusually good regulation ALSO has unusually LOW temp
rise.

A transformer with unusually good regulation was presumably rated that way by
the manufacturer for some reason. Whatever the temperature rise with rated
secondary current, it will be exceeded if the secondary current is greater than
its rating. If the user wants to do that, it's his choice. He should be aware
that under certain conditions, some transformers may give Irms/Idc greater than
2 in rectifier service if used at the stated rating, and this may or may not
cause a problem, depending on the enviroment and other factors.

Which wipes you asinine case out.

Piss off.


...... Phil

 

[John Fields]

On Fri, 18 Jul 2008 09:56:01 +1000, "Phil Allison"
<philallison@tpg.com.au> wrote:

"The Phantom"
"Phil Allison"

For example, for the 24 volt, 8 amp transformer I've mentioned in this
thread,

** An incorrectly rated example.

Plucked out of his arse.


The recommendation that John Fields made, to assume Irms/Idc = 2,
which he says will always be safe, may not be safe if you are using a
transformer with good regulation and if your grid waveform is a good
sinusoid.


** A transformer with unusually good regulation ALSO has unusually LOW
temp
rise.

A transformer with unusually good regulation was presumably rated that way
by
the manufacturer for some reason.

( snip even worse DRIVEL )


** How completely ASININE !!

A transformer with unusually good regulation = a transformer that is
being under utilised !!!

---
Be fair.

Explain that a transformer that might be seen as being under-utilized
while feeding a resistive load might have to be as big as it is in
order to drive reactive loads which pump current back and forth
instead of just forth.
---

No need for exists for transformer makers to make special high regulation
models - the customer simply picks a model with more VA capacity than
strictly needed !!!

---
Generally true, but there _are_ those exquisite ferroresonant
transformers where the dissipation in the regulator following the
bridge and the reservoir doesn't have to depend on the mains voltage,
mas o menos.

And, as one constant voltage transformer builder turned me onto,
running the output of one CVT into the input of another makes the
output of the second all that much finer.


JF

 

[The Phantom]

On Fri, 18 Jul 2008 09:56:01 +1000, "Phil Allison" <philallison@tpg.com.au>
wrote:

"The Phantom"
"Phil Allison"

For example, for the 24 volt, 8 amp transformer I've mentioned in this
thread,

** An incorrectly rated example.

Plucked out of his arse.


The recommendation that John Fields made, to assume Irms/Idc = 2,
which he says will always be safe, may not be safe if you are using a
transformer with good regulation and if your grid waveform is a good
sinusoid.


** A transformer with unusually good regulation ALSO has unusually LOW
temp
rise.

A transformer with unusually good regulation was presumably rated that way
by
the manufacturer for some reason.

( snip even worse DRIVEL )


** How completely ASININE !!

A transformer with unusually good regulation = a transformer that is
being under utilised !!!

No need for exists for transformer makers to make special high regulation
models - the customer simply picks a model with more VA capacity than
strictly needed !!!

Sounds like you have a quibble with the manufacturer, not with me. I only
report the transformer's measured parameters and labelling.

Piss off - you PITA fool.



...... Phil

 

On Jul 17, 7:05 pm, The Phantom <phan...@aol.com> wrote:

On Fri, 18 Jul 2008 09:56:01 +1000, "Phil Allison" <philalli...@tpg.com.au
wrote:





"The Phantom"
"Phil Allison"

For example, for the 24 volt, 8 amp transformer I've mentioned in this
thread,

** An incorrectly rated example.

Plucked out of his arse.

The recommendation that John Fields made, to assume Irms/Idc = 2,
which he says will always be safe, may not be safe if you are using a
transformer with good regulation and if your grid waveform is a good
sinusoid.

** A transformer with unusually good regulation ALSO has unusually LOW
temp
rise.

A transformer with unusually good regulation was presumably rated that way
by
the manufacturer for some reason.

( snip even worse DRIVEL )

** How completely ASININE !!

A transformer with unusually good regulation = a transformer that is
being under utilised !!!

No need for exists for transformer makers to make special high regulation
models - the customer simply picks a model with more VA capacity than
strictly needed !!!

Sounds like you have a quibble with the manufacturer, not with me. I only
report the transformer's measured parameters and labelling.

Could well be that the manufacturer de-rated the transformer slightly
to reduce their liability in case of transformer failure. For
example, if the transformer could really take up to 100 VA, the
manufacturer said the transformer is good for up to 80 VA

Michael

 

[John Fields]

On Sun, 20 Jul 2008 14:07:26 -0700 (PDT), busybeejoe
<busybeejoey@yahoo.com> wrote:

If you are looking for a place to Buy and sell your used stuff and
promote your small business..here is the place to go

I created a NEW forum where you can buy/sell/trade your used stuff and
for small
business owners to promote their services to others in their area...

Its a simple and easy way to let everyone know about your
company and services you offer....and its free to join
http://www.yansbb.com/

---
Take it somewhere else, you SPAMming piece of shit.
JF

 

[John Fields]

On Sun, 20 Jul 2008 20:29:18 -0400, Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:

John Fields wrote:

On Sun, 20 Jul 2008 14:07:26 -0700 (PDT), busybeejoe
busybeejoey@yahoo.com> wrote:


If you are looking for a place to Buy and sell your used stuff and
promote your small business..here is the place to go

I created a NEW forum where you can buy/sell/trade your used stuff and
for small
business owners to promote their services to others in their area...

Its a simple and easy way to let everyone know about your
company and services you offer....and its free to join
http://www.yansbb.com/


---
Take it somewhere else, you SPAMming piece of shit.
JF
Hey hey Now, my virgin ears and eyes!

---
Yeah, right... That "Big Jamie's FAT Girl Club" Pseudo QSL card at:

http://webpages.charter.net/jamie_5"

is enough to gag a maggot and you claim some sort of sensitivity?

JF

 

[Jamie]

John Fields wrote:

On Sun, 20 Jul 2008 14:07:26 -0700 (PDT), busybeejoe
busybeejoey@yahoo.com> wrote:


If you are looking for a place to Buy and sell your used stuff and
promote your small business..here is the place to go

I created a NEW forum where you can buy/sell/trade your used stuff and
for small
business owners to promote their services to others in their area...

Its a simple and easy way to let everyone know about your
company and services you offer....and its free to join
http://www.yansbb.com/


---
Take it somewhere else, you SPAMming piece of shit.
JF
Hey hey Now, my virgin ears and eyes!

http://webpages.charter.net/jamie_5"

 

[John Fields]

On Thu, 24 Jul 2008 23:40:20 +1000, terryc
<newssixspam-spam@woa.com.au> wrote:

On Wed, 23 Jul 2008 09:23:06 -0500, John Fields wrote:


notie this paragraph after I flicked the other answer....

Now, when you consider that that electricity has to come from
_somewhere_ and that is has to be brought into the field using
conductors of finite resistance, then the problem becomes even more
severe.

So instead of 415V supply, you just tap the 11Kv lines instead.

---
How would you do that?

JF

 

[John Fields]

On Thu, 24 Jul 2008 23:38:48 +1000, terryc
<newssixspam-spam@woa.com.au> wrote:

On Wed, 23 Jul 2008 09:23:06 -0500, John Fields wrote:

Typically, to charge a battery fully you've got to put in 1.4 times as
much energy as you took out, which would increase that 5970 amperes to
about 6400 amperes.

Err, is this something to do with fast charging?

---
No, it's the typical coulometric charge-discharge characteristic of a
flooded lead-acid battery.
---

Heard 110% for C/10 in dep-discharge lead acid batteries, but not that
much.

---
It can go higher for SLAs, according to:

http://www.powerstream.com/SLA.htm

JF

 

[terryc]

On Thu, 24 Jul 2008 10:20:50 -0500, John Fields wrote:

It can go higher for SLAs, according to:

http://www.powerstream.com/SLA.htm

Well, I guess I won't be ever buying their batteries then.