Chip with simple program for Toy

In article
<1bdc7786-1ae1-46c9-ab59-edb89980d8e1@a9g2000prl.googlegroups.com>,
Mike H <mike8675309@gmail.com> wrote:

http://i8.photobucket.com/albums/a23/tcw_fort/carparts/wiringcutoffswitch.jpg
Click to expand...
The ignition switch turns the car off, correct? So, feed the ignition
switch from the "low amp line" and it should work as desired without
either K1 or K2. Verify before starting that removing input power to the
ignition switch actually kills the engine, I guess.

Fewer parts, less to go wrong.

Otherwise, what you draw should work.

--
Cats, coffee, chocolate...vices to live by
 
In article
<ab0508ee-4786-4904-8add-6263a524dc41@c19g2000prf.googlegroups.com>,
Mike H <mike8675309@gmail.com> wrote:

Looking at your proposal, if I have a 14gauge wire carrying up to 14.6
volts (alternator output when charging) and as low as 10.5 volts (low
battery power until alt spins up. but enough to fire the ignition
system), what would be the best gauge wire, and method of connecting
it to limit voltage drop over 30 feet (15feet one way) to a minimum.
If I'm going to switch a power source for sensors, I need to be
certain that voltage drop is as minimal as possible otherwise sensor
readings may be mis-interpreted by the EEC-IV processor which monitors
the sensors.
Click to expand...
What matters for voltage drop is not the 10.5-14.6 voltage, but the
current. V=IR, which applies to this problem as "voltage drop" = current
in wire * resistance of wire.

As a specific example or seven (for 30 feet):

10 amps on 16 gage wire - 1.2 V

1 amp - 0.12V

10 amps on 14G wire - 0.75V

1 amp - 0.075V (see a pattern? we'll drop the 1 amp case from here out)

10 amps on 6G - 0.12V

10 amps on 2G - 0.047V

10 amps on 4/0G - 0.015V

You end up making a practical call on wire size .vs. current drawn .vs.
length .vs. acceptable voltage drop for the application. If the circuit
is drawing an amp, 14 ga is probably fine.

The computer presumably already deals with the (large) variability of
the overall voltage in the system, so this may be less critical that you
guess at first. Depends on the sensor type and how it's being
interpreted, which I don't know the specifics of.

--
Cats, coffee, chocolate...vices to live by
 
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:66ta4oF2mg9r9U1@mid.individual.net...
"Bob Monsen"
"Phil Allison"

One of the nice things about AM, and the reason they use it for
aviation, is that power wins. If two signals are colliding, the more
powerful one will always be heard.


** That is how FM behaves - ie the "capture effect".

AM does no such thing - " colliding " signals simply combine in the
receiver and are heard together.

Weak signals are heard in the background of strong ones.


Thanks for the clarification. However, I'm curious about this.


** Firstly - I am very impressed that you accepted my comments in the
spirit they were intended.

A rarity on usenet - my congrats.


An FM signal is really just a frequency shift on the carrier. As I
understand it, the transmitted signal is the carrier frequency shifted in
proportion to the amplitude of the sound that will get transmitted (for
mono).

So, given two transmitters on the same frequency, you end up with two
varying carriers. If your receiver is just receiving both signals, mixing
them down to a lower frequency, detecting the shift, and converting that
into an amplitude, the detector must be doing this locking on. Do you
know how it works? How does it lock on rather than just outputting a
mess?


** Capture effect is almost entirly due to the " limiting " that occurs
in the IF amplifier stages.

Unlike AM, the IF stages of an FM receiver are normally operated very
heavily into overload ( ie gross amplitude clipping ) so the weaker of two
( IF frequency FM signals ) is completely over-whelmed by the stronger
e - which them becomes the only signal present at the FM detector.

There is even a Wiki about it:

http://en.wikipedia.org/wiki/Capture_effect


This feature was seen as a BAD idea for aircraft radio comms - it being
preferable to have something more like a telephone party line, so the
weaker voice could still be heard and even if not read clearly, the pilot
or ground controller could ask for a repeat of the message.

This got screwed up once at Tenerife and two jumbo collided as a result.

http://en.wikipedia.org/wiki/Tenerife_disaster#Communication_misunderstandings




...... Phil
Click to expand...

Egad boy, Tenerife was a series of sequential bad decisions and the captain
not wanting to listen to his co-pilot. There was never a radio lock out,
only a pilot brain lock out. The pilot of one of the aircraft was paranoid
of missing his take off because weather was such that he would not be able
to leave until the next day so every word he hear his brain misinterpreted.
Unfortunately once a VHF aircraft radio press to talk is activated it locks
everyone out!!! You can't yell breaker breaker, well ok you can but you
won't be heard. This is why I gets real nervous in a high traffic area, I am
always afraid that the chatter won't allow me my turn to transmit. .

This all gets a bit muddled when the military are able to use VHF harmonics
in the UHF range. I don't know if it is only for distress beacons ( 121.5
Mhz harmonically picked up on 243 Mhz) or if they can do it on other freqs?

Claude
 
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:66ta4oF2mg9r9U1@mid.individual.net...
"Bob Monsen"
"Phil Allison"

One of the nice things about AM, and the reason they use it for
aviation, is that power wins. If two signals are colliding, the more
powerful one will always be heard.


** That is how FM behaves - ie the "capture effect".

AM does no such thing - " colliding " signals simply combine in the
receiver and are heard together.

Weak signals are heard in the background of strong ones.


Thanks for the clarification. However, I'm curious about this.


** Firstly - I am very impressed that you accepted my comments in the
spirit they were intended.

A rarity on usenet - my congrats.


An FM signal is really just a frequency shift on the carrier. As I
understand it, the transmitted signal is the carrier frequency shifted in
proportion to the amplitude of the sound that will get transmitted (for
mono).

So, given two transmitters on the same frequency, you end up with two
varying carriers. If your receiver is just receiving both signals, mixing
them down to a lower frequency, detecting the shift, and converting that
into an amplitude, the detector must be doing this locking on. Do you
know how it works? How does it lock on rather than just outputting a
mess?


** Capture effect is almost entirly due to the " limiting " that occurs
in the IF amplifier stages.

Unlike AM, the IF stages of an FM receiver are normally operated very
heavily into overload ( ie gross amplitude clipping ) so the weaker of two
( IF frequency FM signals ) is completely over-whelmed by the stronger
e - which them becomes the only signal present at the FM detector.

There is even a Wiki about it:

http://en.wikipedia.org/wiki/Capture_effect


This feature was seen as a BAD idea for aircraft radio comms - it being
preferable to have something more like a telephone party line, so the
weaker voice could still be heard and even if not read clearly, the pilot
or ground controller could ask for a repeat of the message.

This got screwed up once at Tenerife and two jumbo collided as a result.

http://en.wikipedia.org/wiki/Tenerife_disaster#Communication_misunderstandings




...... Phil
Click to expand...

Egad boy, Tenerife was a series of sequential bad decisions and the captain
not wanting to listen to his co-pilot. There was never a radio lock out,
only a pilot brain lock out. The pilot of one of the aircraft was paranoid
of missing his take off because weather was such that he would not be able
to leave until the next day so every word he hear his brain misinterpreted.
Unfortunately once a VHF aircraft radio press to talk is activated it locks
everyone out!!! You can't yell breaker breaker, well ok you can but you
won't be heard. This is why I gets real nervous in a high traffic area, I am
always afraid that the chatter won't allow me my turn to transmit. .

This all gets a bit muddled when the military are able to use VHF harmonics
in the UHF range. I don't know if it is only for distress beacons ( 121.5
Mhz harmonically picked up on 243 Mhz) or if they can do it on other freqs?

Claude
 
<lionelgreenstreet@gmail.com> wrote in message
news:16e7503c-fb32-4e59-ad48-82deeaaa9087@l64g2000hse.googlegroups.com...
I've found this circuit
http://img521.imageshack.us/img521/8127/fasdgspi6.jpg
but i don't konw how to obtain this result
http://img293.imageshack.us/img293/5995/isggsdgps5.jpg
with Rs<<Rl and Req=RjRl/(Rl+Rj)
How can i obtain Pout?
thanks
Click to expand...
Set Rs to 0 and then do your calculations.
 
<lionelgreenstreet@gmail.com> wrote in message
news:16e7503c-fb32-4e59-ad48-82deeaaa9087@l64g2000hse.googlegroups.com...
I've found this circuit
http://img521.imageshack.us/img521/8127/fasdgspi6.jpg
but i don't konw how to obtain this result
http://img293.imageshack.us/img293/5995/isggsdgps5.jpg
with Rs<<Rl and Req=RjRl/(Rl+Rj)
How can i obtain Pout?
thanks
Click to expand...
Set Rs to 0 and then do your calculations.
 
"Bob Monsen" <rcmonsen@gmail.com> wrote in message
news:R87Pj.3451$h75.1710@newssvr27.news.prodigy.net...
"Sky King" <aaron_stansbury@yahoo.com> wrote in message
news:f369c5c2-3e20-4555-872b-5a413cb0a9ef@x41g2000hsb.googlegroups.com...
Is there a web site that will cross reference chip numbers? I have
some older designs I would like to build, but the chips they list are
no longer made. Any help will be helpfull.

Thank you,
Sky King


The nte site has one, but I wouldn't buy their parts, since they are so
expensive.

http://www.nteinc.com/

Regards,
Bob Monsen
Click to expand...
NTE is for lazy folk who don't bother to compare datasheets and instead want
someone else to do it for them and just sell them the damn part. Prices
usually reflect Quantity 1 retail not catalog pricing with min order rules.

Just google the part numbers directly without using a cross ref, find out
the basic function and DC parameters and pinout from a datasheet then try to
find a part using a search tool from a catalog like DigiKey or Mouser for
example.
 
"Bob Monsen" <rcmonsen@gmail.com> wrote in message
news:R87Pj.3451$h75.1710@newssvr27.news.prodigy.net...
"Sky King" <aaron_stansbury@yahoo.com> wrote in message
news:f369c5c2-3e20-4555-872b-5a413cb0a9ef@x41g2000hsb.googlegroups.com...
Is there a web site that will cross reference chip numbers? I have
some older designs I would like to build, but the chips they list are
no longer made. Any help will be helpfull.

Thank you,
Sky King


The nte site has one, but I wouldn't buy their parts, since they are so
expensive.

http://www.nteinc.com/

Regards,
Bob Monsen
Click to expand...
NTE is for lazy folk who don't bother to compare datasheets and instead want
someone else to do it for them and just sell them the damn part. Prices
usually reflect Quantity 1 retail not catalog pricing with min order rules.

Just google the part numbers directly without using a cross ref, find out
the basic function and DC parameters and pinout from a datasheet then try to
find a part using a search tool from a catalog like DigiKey or Mouser for
example.
 
<spamfree@spam.heaven> wrote in message
news:98dp045ig5umlufvpp2n2c58hgag6ldbl3@4ax.com...
Sorry for such a simple question, but I've got a few 120mm
240V .125A (?30W) axial fans like a bigger version of the case
cooling fans in a computer.

I've set one up in a box with a large truck air filter so I can run it
24/7 to remove dust from my house atmosphere. At the moment, the
aircons and computers do it :)

Unfortunately these fans are a little too energy hungry and noisy.

What are my options for slowing them down a tad?

I thought of adding a resistance in line, but this would only
dissipate heat -- not lost in Winter, but a waste of money in Summer.

Then I thought about running two of these in series.

Is there any cheap and cheerful way to cut down on these over
enthusiastic, but otherwise great little ball bearing fans?

Thanks, jack
Click to expand...
Just wire it to a lamp dimmer.
 
<spamfree@spam.heaven> wrote in message
news:98dp045ig5umlufvpp2n2c58hgag6ldbl3@4ax.com...
Sorry for such a simple question, but I've got a few 120mm
240V .125A (?30W) axial fans like a bigger version of the case
cooling fans in a computer.

I've set one up in a box with a large truck air filter so I can run it
24/7 to remove dust from my house atmosphere. At the moment, the
aircons and computers do it :)

Unfortunately these fans are a little too energy hungry and noisy.

What are my options for slowing them down a tad?

I thought of adding a resistance in line, but this would only
dissipate heat -- not lost in Winter, but a waste of money in Summer.

Then I thought about running two of these in series.

Is there any cheap and cheerful way to cut down on these over
enthusiastic, but otherwise great little ball bearing fans?

Thanks, jack
Click to expand...
Just wire it to a lamp dimmer.
 
"Bill Bowden" <wrongaddress@att.net> wrote in message
news:77a2a704-f080-4e01-897d-cee2c1f2eb28@h1g2000prh.googlegroups.com...
What is the best approach to generate a delayed output from a trigger
input to a PIC microcontroller? The idea is to have a constant known
time from trigger input to output, so I don't want to poll the logic
level on some pin due to the jitter that would occur. Thought about
using the comparator module to generate an interrupt, but it seems
complicated setting and clearing all the various bits and reference
levels.
Click to expand...

Use a timer?

Use a delay circuit that triggers another inteterrupt. Essentially use a cap
and res with the appropriate delay. A pic pin supplies the voltage charging
up the capacitor. Once the cap has reached the appropriate level it triggers
an interrupt pin(needs to be schmitt triggered and the pin that charges the
cap needs to be reset). Probably not the best way but would work well for
very long delays(> s)

Just don't see why you don't use a timer interrupt as it is probably the
most natural method.
 
<spamfree@spam.heaven> wrote in message
news:dm2r04t2j4338o9ge3rjbmqe7rck34086d@4ax.com...
On Tue, 22 Apr 2008 14:25:24 +0800, spamfree@spam.heaven wrote:

On Mon, 21 Apr 2008 23:47:42 +0800, spamfree@spam.heaven wrote:

I've read that a transformer would be OK.
I see a cheapie 36V that would suit.
What speed would the fan likely do (fraction of full speed) at 36V?
Perhaps around half speed, if the curve I/rpm is logarithmic?

Could someone check my calculation, please?

The motor draws 125mA at 240V.
So at 36V, it should draw roughly 36/240 x 125 = 18.75 mA
The VA (~Watts) here will be 18.75 x 36/1000 = 0.675 W
Which will cost me ~ $1 per annum to run.

What would be the approximate efficiency of the transformer?

Cheers, jack
Click to expand...
At some point the voltage will be to low to start the motor, it will run
if pushed, it just won't start.
My favorite solution is to use a series capacitor (non polarized, voltage
appropriate) to drop some of the voltage. The capacitor is smaller than a
transformer and produces much less heat than a resistor.
I don't have the math ability to calculate the proper capacitance and you
don't know what voltage you want on the fan. So use a transformer, resistor,
or variac to find the proper speed then measure the voltage across the
motor. With the wanted voltage known, someone on here can calculate the
proper capacitance.
I would try putting the two fans in series that may be the simplest
solution.
Anyone know how to model that motor in LTspice. Is it as simple as an
inductor? (or as complicated :))

Mike
 
"Bill Bowden" <wrongaddress@att.net> schreef in bericht
news:77a2a704-f080-4e01-897d-cee2c1f2eb28@h1g2000prh.googlegroups.com...
What is the best approach to generate a delayed output from a trigger
input to a PIC microcontroller? The idea is to have a constant known
time from trigger input to output, so I don't want to poll the logic
level on some pin due to the jitter that would occur. Thought about
using the comparator module to generate an interrupt, but it seems
complicated setting and clearing all the various bits and reference
levels.

Is there an easier way?

-Bill
Click to expand...
Assuming the trigger not to be synchronous with the PICs clock, you will
always have some jitter. That will be always the case when using
asynchronous systems.

As for the PIC, you did not mention what PIC you have in mind. The usual way
is using the trigger signal to start an interrupt routine. This routine in
turn starts a timer/counter that interrupts when delaytime is over. I see no
use for comparators in this scheme.

petrus bitbyter
 
"christofire" <christofire@btinternet.com> wrote in message
news:3oadnUaQEbX1-pfVnZ2dnUVZ8t2snZ2d@bt.com...
"Don Bowey" <dbowey@comcast.net> wrote in message
news:C42E653D.B6601%dbowey@comcast.net...
On 4/18/08 11:25 AM, in article lI5Oj.4682$iK6.2220@nlpi069.nbdc.sbc.com,
"Joerg" <notthisjoergsch@removethispacbell.net> wrote:

Don Bowey wrote:
On 4/18/08 8:16 AM, in article fuae44$6tg$1@dns3.cae.ca, "Claude"
claudec@cae.com> wrote:

"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:cJMNj.6968$GE1.6102@nlpi061.nbdc.sbc.com...
Michael Black wrote:
On Wed, 16 Apr 2008, Bob Eld wrote:

"Archimedes" <shelton.dcruz@gmail.com> wrote in message
news:b3b30960-27bc-4d59-924f-4312caffe7c2@x41g2000hsb.googlegroups.com...
Hi all

If I change the tank circuit components (reduce the capacitance
and
inductance) and change the transistors to appropriate VHF ones,
will I
be able to pick up ATC (Air Traffic Conversations) using this
circuit ?

http://www.electronics-lab.com/projects/rf/006/index.html

Thanks
Shelton.
Not likely. I doubt you'd ever get that circuit to work at VHF
frequencies
no matter what you did with the resonant circuit portion. There are
many
problems including wrong impedances for the various parasitic
capacitances.

Secondly air traffic stuff is FM I believe.

Military may use FM, I don't know, but airplane related
communication is
unique in that it does use actual AM.

A project that saw publication a number of times in the old days
took
advantage of that, a "crystal radio" that tuned VHF. It was nothing
more than a tuned circuit and a diode detector feeding an earphone,
not
sensitive but useful near airports and since it didn't radiate
anything,
even useable (though maybe not legally) on an actual airplane.

The description of the circuit says it's a regen receiver, and those
were never popular at VHF, I'm assuming instability came into play.
You did see superregen receivers there. Either type will radiate,
and
that's not a good thing in the aircraft band.

Yes, and then you'd quickly have visitors coming with vehicles
bearing
government license plates. A regen-receiver is most definitely not a
good
idea in the aircraft band.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
Quite correct, it is most likely jail time where you will have hours
and
hours of fun designing electronics such as movement alarms
that will detect the proximity of "fellow inmates" . Just swearing on
an ATC
frequency will net you a $2,500 fine in Canada, I can't even imagine
what
they would do to you if you jammed one of their frequencies.

Claude
Montreal



One of you naysayers should estimate the amount of radiated energy from
a
typical regen receiver.

Also, what is the distance from the intended regen location to the
airport,
and what would you imagine the comparative strengths would be of the
regen
signal and air traffic signals at air traffic receivers?

The regen receiver radiated signal would be lost in the noise.


The other party to air traffic communication are aircraft. Those happen
to roam about quite a bit :)

Seriously, disregarding the airstrip that's almost next to the office
here we are also roughly in the flight path for Mather Field. Altitude
above our building maybe 1500ft, give or take. If Fedex, DHL and other
pilots would report some weird shhhhht noise everytime they pass a
certain spot, guess what would happen?

I doubt that at 1500 feet the signal from a regen receiver would break
the
squelch.



If a malfunctioning DTT set-top box can radiate enough to set off a SARSAT
and call out air-sea rescue, I have little doubt what a regen receiver is
capable of if it goes anywhere near the relevant frequency, especially if
connected to an antenna cut for one of the aero bands. See
http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2006/01/15/ufreeview.xml&sSheet=/portal/2006/01/15/ixportaltop.html

I wonder what they charge for vexatious call-outs!

Chris
Which probably explains why the new 406 EPIRB transmits to the satellite at
Click to expand...
406 Mhz which is ( I believe ) in a protected area of the spectrum. I do
agree with you, the power involved is less than 5 watts ( not a researched
number) so any hack fooling around with a transmitter in that range could do
funny stuff. One new fail-safe feature is active on 406 EPIRBS is that the
satellite is listening for an embedded digital signal that identifies the
EPIRB. Each device has a unique identifier and the first thing a SAR station
does is call the registered owner on the phone. If you own such an EPIRB
please ensure that it is properly registered.

While I am here , anyone out there have plans for a functional cell phone
jammer that could jamm all 4 protocols to within 50 feet or so? I have seen
theoretical papers ( Google) but would like to know if any hobbyist has
ever built a successful one?

Claude
Montreal
 
"Dope Bowey"

"JeffM"

Bret Cahill wrote:
:10X More Efficient

Cite your sources for 920% efficiency.

Cite where you think he said that. It's not in this thread.
Click to expand...

** What is 10 times more efficient than 92 % ??

920% ?

The OP's question is an absurd troll.

Like you.



....... Phil
 
"Bret Cahill" <BretCahill@aol.com> wrote in message
news:98d0c415-606a-4d10-8158-1ee67568e4e6@26g2000hsk.googlegroups.com...
Is there some low frequency radiation or hysterisis loss or what?
Click to expand...
The losses in electrical transmission have increased from about 5% to 9.5%
in recent years, so efficiency is 90.5% to 95%.
http://www.energetics.com/gridworks/grid.html. There is a nice overview at:
http://www.energetics.com/gridworks/pdfs/factsheet.pdf

According to http://en.wikipedia.org/wiki/Electric_power_transmission,
power losses were about 7.2% in 1995. And according to
http://en.wikipedia.org/wiki/High-voltage_direct_current, HVDC transmission
losses are about 3%. So a tenfold increase in efficiency seems
unreasonable.

I would assume that a tenfold increase in efficiency would be a tenfold
reduction in losses, so the present 7.2% would be 0.72%, for 99.3%
efficiency. That is very likely impossible outside of laboratory
conditions, and would probably require impractical amounts of copper, or
cryogenic means to achieve superconductivity, which would itself require
power and reduce overall efficiency.

But in direct answer to your question, there is a substantial amount of
radiated energy loss with AC that does not occur with DC. But open air DC
transmission lines do have losses in the form of a flow of ions, and both
AC and DC have losses due to corona.

Paul
 
"Bret Cahill" <BretCahill@aol.com> wrote in message
news:98d0c415-606a-4d10-8158-1ee67568e4e6@26g2000hsk.googlegroups.com...
Is there some low frequency radiation or hysterisis loss or what?
Click to expand...
The losses in electrical transmission have increased from about 5% to 9.5%
in recent years, so efficiency is 90.5% to 95%.
http://www.energetics.com/gridworks/grid.html. There is a nice overview at:
http://www.energetics.com/gridworks/pdfs/factsheet.pdf

According to http://en.wikipedia.org/wiki/Electric_power_transmission,
power losses were about 7.2% in 1995. And according to
http://en.wikipedia.org/wiki/High-voltage_direct_current, HVDC transmission
losses are about 3%. So a tenfold increase in efficiency seems
unreasonable.

I would assume that a tenfold increase in efficiency would be a tenfold
reduction in losses, so the present 7.2% would be 0.72%, for 99.3%
efficiency. That is very likely impossible outside of laboratory
conditions, and would probably require impractical amounts of copper, or
cryogenic means to achieve superconductivity, which would itself require
power and reduce overall efficiency.

But in direct answer to your question, there is a substantial amount of
radiated energy loss with AC that does not occur with DC. But open air DC
transmission lines do have losses in the form of a flow of ions, and both
AC and DC have losses due to corona.

Paul
 
"Benj"
The OP's question is an absurd troll.

Like you.


Are modern "scientists" really this dense? Ten times efficient isn't
920%! What you must have just graduated from a "modern" high school?
Dig. If standard transmission is 92% efficient, then that means there
is 8% of the energy lost. TWICE as efficient would only have 4% of the
energy lost or would be 96%. The interested student can take it from
there...
Click to expand...

** WHAT COMPLETE BOLLOCKS !!





...... Phil
 
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