Chip with simple program for Toy

[Bob Monsen]

Lee wrote:

does anyone know a circuit of a window comparator using only a single
op-amp...i need a shematic for this...tnx

Hmmm. There was a posting on sci.electronics.design recently asking for
the same thing. Go look there.

---
Regards
Bob Monsen

 

[ryan wiehle]

Bob Monsen wrote:

Lee wrote:
does anyone know a circuit of a window comparator using only a
single op-amp...i need a shematic for this...tnx

Hmmm. There was a posting on sci.electronics.design recently asking
for the same thing. Go look there.

---
Regards
Bob Monsen

same user

 

[Rich Webb]

On 7 May 2005 16:44:40 -0700, "seattle dave" <seattlemanila@comcast.net>
wrote:

I want to cause static or interference on a line that leads from
the wall to a callmaster IV made by Lucent. These are phones used in
call-centers... The line has eight wires and I think it is the same as

a computer data line?? There is no other power source to the Lucent
callmaster, so one of the wires must carry power. The wires are all
small however... It is the same cord as is attached to a computer modem

to a computer....


thanks for any help on this...

I usually just use something like an empty potato chip bag, although
plain paper works just as well. Hold it up by the mouthpiece and crinkle
it in your hand.

;-)

--
Rich Webb Norfolk, VA

 

[Rich Webb]

On Sat, 07 May 2005 23:22:02 -0500, "ryan wiehle" <rw@netscape.net>
wrote:

Bob Monsen wrote:

Lee wrote:
does anyone know a circuit of a window comparator using only a
single op-amp...i need a shematic for this...tnx

Hmmm. There was a posting on sci.electronics.design recently asking
for the same thing. Go look there.

---
Regards
Bob Monsen

same user

Same homework question.

--
Rich Webb Norfolk, VA

 

[Bob Monsen]

ryan wiehle wrote:

Bob Monsen wrote:


Lee wrote:

does anyone know a circuit of a window comparator using only a
single op-amp...i need a shematic for this...tnx

Hmmm. There was a posting on sci.electronics.design recently asking
for the same thing. Go look there.

---
Regards
Bob Monsen


same user

In that case...


10V--------o--------.
| |
| |
[220k] [100k]
| |
| |
| |
.->|--o-------(--- Inverting Input
| | |
Vin-o | |
| | |
'----(---|<----o-- Noninverting Input
| |
| |
[100k] [220k]
| |
| |
| |
| |
| |
| |
Gnd--------o--------'

The output of the comparator will go high when Vin is between 2.5V and
7.5V. The things in [] are resistors. The ->|- are diodes. It should be
viewed using a fixed space font, like courier. Otherwise, nothing lines up.

You get to set the window by changing the resistor values. The low
window limit is set by the left two resistors, whereas the high window
limit is set by the right two resistors.

As the input increases from 0, the noninverting input first follows the
input at 0.7V above it. The inverting input is fixed at 3.125V. Once the
input gets to be 2.5V, the output of the comparator will go high, since
the non-inverting input will then exceed the inverting input (which is
still fixed at 3.125V.)

As the input continues to increase, once it gets to 3.125 + 0.7V, the
inverting input will start to rise. It's still 1.4V lower than the
non-inverting input, so the output is still high.

When the input gets to 6.875-0.7V, the non-inverting input will stop
increasing. The inverting input will continue to climb as it has been
doing. Once the input gets to be 6.875+0.7V, the inverting input will be
larger than the now fixed non-inverting input, and the output will go low.

Thus, the output is high when 2.5V < Vin < 7.5V.

---
Regards,
Bob Monsen

 

[Lord Garth]

"seattle dave" <seattlemanila@comcast.net> wrote in message
news:1115509480.961696.221200@f14g2000cwb.googlegroups.com...

I want to cause static or interference on a line that leads from
the wall to a callmaster IV made by Lucent. These are phones used in
call-centers... The line has eight wires and I think it is the same as

a computer data line?? There is no other power source to the Lucent
callmaster, so one of the wires must carry power. The wires are all
small however... It is the same cord as is attached to a computer modem

to a computer....


thanks for any help on this...


would a strong radio signal interfer??

When a cell phone is about to ring, you can hear the electrical noise
on the wired phone if the two are in close proximity.

 

[Rono]

Sony, & anything made by Sony (Dell monitors), etc,
have these aperture-grill technology. These faint dark
lines running horizontally, are due to the "Sony" CRT
design. Makes for a great picture! Rono.

 

[Ban]

thomas wrote:

where in Germany can I order elcetronic things, which are not so
expensive like "conrad" ?

ask here:
de.sci.electronics
--
ciao Ban
Bordighera, Italy

 

[Bob Monsen]

Rich Webb wrote:

On Sat, 07 May 2005 23:22:02 -0500, "ryan wiehle" <rw@netscape.net
wrote:


Bob Monsen wrote:


Lee wrote:

does anyone know a circuit of a window comparator using only a
single op-amp...i need a shematic for this...tnx

Hmmm. There was a posting on sci.electronics.design recently asking
for the same thing. Go look there.

---
Regards
Bob Monsen

same user


Same homework question.

I don't have a problem with folks asking homework questions. Electronics
is part theory, part recipies, like all engineering. Sometimes, the best
way to proceed is to ask.

---
Regards,
Bob Monsen

 

[Rich Webb]

On Sun, 08 May 2005 10:24:51 -0700, Bob Monsen <rcsurname@comcast.net>
wrote:

Rich Webb wrote:
On Sat, 07 May 2005 23:22:02 -0500, "ryan wiehle" <rw@netscape.net
wrote:


Bob Monsen wrote:


Lee wrote:

does anyone know a circuit of a window comparator using only a
single op-amp...i need a shematic for this...tnx

Hmmm. There was a posting on sci.electronics.design recently asking
for the same thing. Go look there.

---
Regards
Bob Monsen

same user


Same homework question.


I don't have a problem with folks asking homework questions. Electronics
is part theory, part recipies, like all engineering. Sometimes, the best
way to proceed is to ask.

I don't have a problem with it, either, providing that the poster
demonstrates that he has invested some effort into solving the problem
himself. The goal isn't the answer to the question, it's the method of
solving it.

--
Rich Webb Norfolk, VA

 

[John Fields]

On Wed, 04 May 2005 17:04:04 GMT, "Lord Garth" <LGarth@Tantalus.net>
wrote:

"Fred Abse" <excretatauris@cerebrumconfus.it> wrote in message
newsan.2005.05.04.10.28.20.878117@cerebrumconfus.it...
On Tue, 03 May 2005 14:27:15 +0000, Rich Grise wrote:

We mean what we say in Texas! Why bother to use sterile needles
though?

In case the executioner slips and sticks himself.

Do they actually make non-sterile hypodermic needles?

I've stuck myself with a .020" liquid dispenser nozzle. They're ground
round at the end, but that doesn't stop them going in :-(


You're probably correct about non-sterile hypodermic needles but nothing
is stopping its reuse!

I saw a series of micrographs of the point of a hypodermic needle, amazing
how dull it gets after just three uses. This makes me wonder about how bad
the needles were in the old days when the tools were autoclaved and reused.


I have knelt down in the lab, stabbing 13 pins of a 16 pin dip into my knee.
Talk about ouch!!! I had to use my pliers to remove the damn thing.

---
So how are you getting along now with no knee?^)


--
John Fields
Professional Circuit Designer

 

[John Fields]

On Wed, 27 Apr 2005 19:28:55 -0700, Jamie
<jamie_5_not_valid_after_5_Please@charter.net> wrote:

10 Volts RMS. would be something like 10.4 if this AC wave was
converted to a clean DC to represent the peak..

---
Wrong. 10VRMS ~ 14.14VPK

--
John Fields
Professional Circuit Designer

 

[Ban]

LightBoy wrote:

Michael !

That is such a great idea! The op-amp route I mean. I will look into
that for sure. I will also check out your suggestion of looking to see
what TI might have.
Thanks so much for your very helpful reply.

If you want a professional quality pre one chip solution try this
http://focus.ti.com/docs/prod/folders/print/ina217.html
this is meant for balanced operation. But if you just have a small electret
mike capsule, an inverting opamp stage will do as well.
--
ciao Ban
Bordighera, Italy

 

[Lord Garth]

"John Fields" <jfields@austininstruments.com> wrote in message
news:2nqs71pkv2m555oune59j295s4p0a6jnuv@4ax.com...

On Wed, 04 May 2005 17:04:04 GMT, "Lord Garth" <LGarth@Tantalus.net
wrote:


I have knelt down in the lab, stabbing 13 pins of a 16 pin dip into my
knee.
Talk about ouch!!! I had to use my pliers to remove the damn thing.

---
So how are you getting along now with no knee?^)

I am a card carrying member of club crunchy but I can still jog....
That particular injury took a while to heal. The safety label on
the solder roll says to wash your hands after using the product
but nothing about when it's injected!

Talk about cursing...yeah, I did!

 

[Ban]

LightBoy wrote:

Thank You, Ban,

I looked at the link and at the product in your posting. It would be
perfect - as would other op-amp soulutions, except for the fact I
would have to completely re-do the power supply to provide + (plus)
and - (minus) voltages.

As this is for installing in an existing product - I really hope to
find a solution that does not require a plus and minus voltage supply.
I will keep looking and very much appreciate the suggestions I am
receiving here. I am sure I will find some solution - probably through
all the great people in this group.

Don, maybe you should scan the circuit or at least specify what voltage you
have available and what kind of microphone you want to connect.
Some mikes require a small DC-voltage (electret-capsules) to function,
others (professional condensor-mikes) need phantom-power (12 to 48V), some
have built-in batteries and some (dynamic) do not need any DC supply to
function properly.
Also the above chip doesn't necessarily need a bipolar supply, it also works
as well on a unipolar supply between +8 and +36V. There are ways to create a
virtual midpoint when you couple the signal via capacitors.

--
ciao Ban
Bordighera, Italy

 

[Dr Engelbert Buxbaum]

TM wrote:

"Mobile Phone EMF safety concerns becomes an Insurance risk for telcos"

This is something I have always wondered about: People worry about
electromagnetic fields from the towers, but happily place a mobile phone
against their head (or allow their children to do so), which produces
much higher field strengths.

And note that mobiles produce electric fields all the time (to keep the
contact with the net), not only while you are actually phoning with
them.

 

[Dr Engelbert Buxbaum]

mystraightroad wrote:

thank you so much for your replies.

Ok, I have a feeling this is a stupid question but here goes....

If we assume that the draw is twice the max output (75w) would it hurt
if I were to use a transformer rated at 300w rather than one at 100w.
A friend has said they will lend me a 300w transformer, I'm just
concerned it might be too strong.

It will work just fine, however, power losses (nothing works with 100%
efficiency) will be slightly higher. For something used only
sporadically that's nothing to worry about.

 

[John Popelish]

josh00@comcast.net wrote:

Can someone show me in the most generic form how a clamping diode
works? I have some cicuit anaylsis background from years ago, but I
cant seem to remember coming across this item. I've read the theory but
I still don't see it in a real circuit and how it "clamps". Are there
different ratings on clamping diodes? Basically I have a problem with a
transient spike that jumps from nominal 20V dc up to 30V dc and down to
-10V dc in about 1ms time. I'm was told a clamping diode will work.

Thanks

There are two distinct ways to clamp voltage peaks with diodes. one
involves a diode from the signal line to a supply voltage or ground
that becomes forward biased when the signal voltage gets one diode
drop (about .3 volts for silicon Schottky diodes and about .6 volts
for silicon junction diodes) past the particular supply voltage. This
provides a low impedance path for current that tends to load the
signal voltage down if it tries to go further.

The second method involved putting a device between the signal and
ground that has a high impedance up to some breakdown voltage, and
switches to a low impedance for higher voltages. A zener diode is the
classic example of this sort of clamp but there are lots of
variations, including Metal Oxide Varistors for higher voltages and
bidirectional high surge current zeners. These devices turn the
energy that would have produced an over voltage into heat.

 

[Pablo]

<Ronald700106@yahoo.com> wrote in message
news:1115230316.962255.130270@g14g2000cwa.googlegroups.com...

This is the most important question of your life.

The question is: Are you saved?

Saved from what?

It is not a question of how good you are,
nor if you are a church member, but are you saved?

From what?

Are you sure you will go to Heaven when you die?

Are you sure there's a heaven!

The reason some people don't know for sure if they
are going to Heaven when they die is because they
just don't know.....

If there's a heaven

The good news is that you can know for sure that
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Can I get it in writing?

The Holy Bible describes Heaven as a beautiful
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Can you point out where heaven is...is in near the Big Dipper?

God tells us in the Holy Bible how simple it is
to be saved so that we can live forever with Him
in Heaven.

Saved from what?

"For if you confess with your mouth Jesus is Lord
and believe in your heart that God raised Him from
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Confess to what?

Over 2000 years ago God came from Heaven to earth
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What sins?

Jesus Christ was born in Israel supernaturally to
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Sounds like Sci-Fi

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Who's keeping records?

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What about Mary M.?

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If you would like God to forgive you of your past,
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Can I set up a meeting?

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So you can be a "bum" and he doesn't care....sounds like a politician

Just pray the prayer below with your mouth and mean
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Dear Jesus Christ, I want to be saved so that I can
have a home in Heaven with You when I die. I agree
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Just like that...its harder to become a Boy Scout

As a child of God we are to avoid sin(wrongdoing),
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children, I write this to you so that you will not
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to the Father in our defense Jesus Christ,
the Righteous One."

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The Holy Bible descibes Hell as a place of eternal
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The good news is that you can avoid Hell by allowing
Jesus Christ to save you today. Only then will you
have true peace in your life knowing that no matter
what happens you are on your way to Heaven.


Praise the Lord!
Servant of the Lord Jesus Christ
Ronald L. Grossi


* Show this to your family and friends so they can also be saved.

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[John Popelish]

hartlyuk@yahoo.com wrote:

How can a two way conversation be transmitted along two wires of my
residential phone line?.
Why don't the signals confuse(collide) each other as they travel
simultaneously in opposite directions along these two pieces of copper
wire from the pole to my phone?.

This is not about fancy elctronics,as the same applied in the 1880s

As far as the copper is concerned, the two signals are just added

together. For a simple phone loop, you hear both your own voice and
the other person's voice in your ear piece. The tricky part cane in
when the lines got long enough that amplifiers were needed. Then the
two signals had to be separated, so that one amplifier boosted the
signal going one way, and another amplifier boosted the signal going
the other way. I think the first fancy electronics invented for this
purpose was the hybrid transformer, that performed this separation.

Perhaps this page will help:
http://www.du.edu/~etuttle/electron/elect61.htm