Chip with simple program for Toy

[Lord Garth]

"jason" <cheanglong@gmail.com> wrote in message
news:1112975787.574574.193710@z14g2000cwz.googlegroups.com...

by the way, mine is to create an oscillating circuit using nmosfet, tap
capacitor, inductor as feedback.
Kindly enlighthen if there is anything else to be added
Thank you so much Garth and Andrew

Is Rs actually Rds? (the channel resistance)

In any case, recall that you must get the proper amount of phase
shift or there will be no oscillator.

Good luck!

BTW, why are you doing this?

 

[Lord Garth]

"phaeton" <blahbleh666@hotmail.com> wrote in message
news:1112977313.723687.233440@l41g2000cwc.googlegroups.com...

First off, thanks to all who guided me on the prev. topic of battery
combinations for odd voltages. Next, i just have a minor question
probably of little consequence. Might make for a fun discussion,
though.

I'm about to build the small amplifier and mount it with a cheapo 6"x9"
4-ohm speaker in a Rubbermaid storage tub. No I'm not expecting
stellar performance, it's just a "toy" :-D Anyways, while trying to
determine the best place to mount the battery, i took the cheesy route
and just stuck it onto the speaker magnet.

The back of the speaker magnet is not electrically "live" in any way,
and this is a normal-everday 9V. Though the effects are probably very
negligible, what sort of influence on the electrochemical reaction
within the battery would you propose the magnetic field may cause?

Just curious, not important, and thanks always.

-phaeton

Don't sweat it!

 

[Don Bruder]

In article <1112977313.723687.233440@l41g2000cwc.googlegroups.com>,
"phaeton" <blahbleh666@hotmail.com> wrote:

First off, thanks to all who guided me on the prev. topic of battery
combinations for odd voltages. Next, i just have a minor question
probably of little consequence. Might make for a fun discussion,
though.

I'm about to build the small amplifier and mount it with a cheapo 6"x9"
4-ohm speaker in a Rubbermaid storage tub. No I'm not expecting
stellar performance, it's just a "toy" :-D Anyways, while trying to
determine the best place to mount the battery, i took the cheesy route
and just stuck it onto the speaker magnet.

The back of the speaker magnet is not electrically "live" in any way,
and this is a normal-everday 9V. Though the effects are probably very
negligible, what sort of influence on the electrochemical reaction
within the battery would you propose the magnetic field may cause?

Nothing of any significance at the level of "zoom" you're talking.
"Zoomed in" to the point where chemical reactions "become visible", it's
at least *possible*, even if not particularly *likely*, that the
magnetic field would tend to cause some sort of "clumping", or perhaps
"aligning" of the ingredients in the battery due to possible differing
amounts of susceptibility to magnetic influences, but I wouldn't expect
to see such a thing (assuming it happens at all) causing any observable
effect in the overall "batteries make volts" view.

Just curious, not important, and thanks always.

Interesting question, even though it would seem to me that the answer
would be of little or no actual importance under real-world conditions.
Perhaps in a lab environment such as "trying to build molecules an atom
at a time" such a consideration would be crucial, but for your purposes,
any effect it has would most likely be so small that it probably can't
even be detected, let alone measured.

--
Don Bruder - dakidd@sonic.net - New Email policy in effect as of Feb. 21, 2004.
Short form: I'm trashing EVERY E-mail that doesn't contain a password in the
subject unless it comes from a "whitelisted" (pre-approved by me) address.
See <http://www.sonic.net/~dakidd/main/contact.html> for full details.

 

[Lord Garth]

"jason" <cheanglong@gmail.com> wrote in message
news:1112978436.292924.234510@z14g2000cwz.googlegroups.com...

I got my circuit oscillating but do not know how to do hand calculation
to prove it
. so wish to know the reason for 1/wc<<Rs

Since the Xl & Xc cancel, you get the required 180 degree phase shift.
Given the above, Z is Rs so the current through the node is high and
the drop across the node is low. This should prove the circuit is
oscillating.

 

[Peter Bennett]

On 8 Apr 2005 08:42:26 -0700, hartlyuk@yahoo.com (hartly) wrote:

Why does it say '4 Amp-hrs.(20 hour rate)' on a battery?.
I know it means it can give out 1 amp. for 4 hours.
But does 20 hr.rate mean that in reality it can only give out 0.2
amps.for 20 hours(making 0.2x20=4Ah.)?.
Thanks, Hartly

It means that the ampere-hour rating is based on discharging the
battery over a period of 20 hours (this is, I think, the most common
way to determine AH ratings)

If the battery is discharged at a higher rate, you will get less total
energy out of it. For example, if you discharge it at 0.4A, you might
only get 3.8 AH.


--
Peter Bennett VE7CEI
email: peterbb4 (at) interchange.ubc.ca
GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html
Newsgroup new user info: http://vancouver-webpages.com/nnq

 

[Active8]

On Fri, 08 Apr 2005 16:40:29 GMT, Don Bruder wrote:

In article <1112977313.723687.233440@l41g2000cwc.googlegroups.com>,
"phaeton" <blahbleh666@hotmail.com> wrote:

First off, thanks to all who guided me on the prev. topic of battery
combinations for odd voltages. Next, i just have a minor question
probably of little consequence. Might make for a fun discussion,
though.

I'm about to build the small amplifier and mount it with a cheapo 6"x9"
4-ohm speaker in a Rubbermaid storage tub. No I'm not expecting
stellar performance, it's just a "toy" :-D Anyways, while trying to
determine the best place to mount the battery, i took the cheesy route
and just stuck it onto the speaker magnet.

The back of the speaker magnet is not electrically "live" in any way,
and this is a normal-everday 9V. Though the effects are probably very
negligible, what sort of influence on the electrochemical reaction
within the battery would you propose the magnetic field may cause?

Nothing of any significance at the level of "zoom" you're talking.
"Zoomed in" to the point where chemical reactions "become visible", it's
at least *possible*, even if not particularly *likely*, that the
magnetic field would tend to cause some sort of "clumping", or perhaps
"aligning" of the ingredients in the battery due to possible differing
amounts of susceptibility to magnetic influences, but I wouldn't expect
to see such a thing (assuming it happens at all) causing any observable
effect in the overall "batteries make volts" view.

Just curious, not important, and thanks always.

Interesting question, even though it would seem to me that the answer
would be of little or no actual importance under real-world conditions.
Perhaps in a lab environment such as "trying to build molecules an atom
at a time" such a consideration would be crucial, but for your purposes,
any effect it has would most likely be so small that it probably can't
even be detected, let alone measured.

"Clumping" could be prevented by periodically rotating the batt, if
"clumping" existed in appreciable amounts. That *was* a good
question, though. My mother told me that a magnet would kill a
battery. Not sure where she got that uninformed bs, but it's
conceivable that others have heard the same, so it's good to dispel
such myths.


--
Best Regards,
Mike

 

[John Fields]

On 8 Apr 2005 07:09:46 -0700, mowhoong@hotmail.com (mowhoong) wrote:

Capacitor with a range of 105 Celsius & life 8000 hours? I am curious to know
who will design a circuit put under such high temp. & only last for eight thousend
hours, other component like plastic will also deform due to high temp.Do you think
it make sense ? Can any person know the reason. Thanks.

---
_Only_ 8000 hours? Downhole equipment is routinely expected to not
only survive, but to work in environments in excess of 200°C, so that
2000 hours gets eaten up pretty quickly.

--
John Fields
Professional Circuit Designer

 

[Active8]

On 07 Apr 2005 19:42:44 GMT, Roger Johansson wrote:

An online equation solver, for really lazy people

Not to mention very patient or willing to accept no answer at all.

solve x^3 - x^2 -y = 0 for x

http://www.algebrahelp.com/calculators/equation/calc.jsp

--
Best Regards,
Mike

 

[Lord Garth]

"phaeton" <blahbleh666@hotmail.com> wrote in message
news:1112986207.678226.45900@o13g2000cwo.googlegroups.com...

Lord Garth says:
Don't sweat it!

Don't sweat what? The battery? The speaker? The asking questions?
Your accusation that i have been smoking Si?

Don Bruder says:
Nothing of any significance at the level of "zoom" you're talking.

Oh I know.... any effect would be completely negligible, particularly
for this application. The clumping and aligning is what i was
visualizing, but i'm sure that the electrons would get pulled out of
this arrangement just the same when I threw the switch and turned the
circuit on.

I thought it was an interesting question

Smoking Si--> burning silicon based electronic components but that was
from another day when (you) we were joking with the OP of that thread. I
though most would understand the slightly obscure jest. But then I though
that was directed to Rich as it followed on of his replies.

To the OP of this thread, "Don't sweat it" means that it is okay to let the
battery hang from the speaker magnet. I've done that myself and it cause
no problems.

It is an interesting question reminescent of the arguments regarding storage
of
a car battery on a concrete surface and their apparent rapid discharge
having
done so.

Lighten up!

 

[Lord Garth]

"John Fields" <jfields@austininstruments.com> wrote in message
news:gjkd5112fk5577upjghkl1v8oe08n38p5p@4ax.com...

On 8 Apr 2005 07:09:46 -0700, mowhoong@hotmail.com (mowhoong) wrote:

Capacitor with a range of 105 Celsius & life 8000 hours? I am curious to
know
who will design a circuit put under such high temp. & only last for eight
thousend
hours, other component like plastic will also deform due to high temp.Do
you think
it make sense ? Can any person know the reason. Thanks.

---
_Only_ 8000 hours? Downhole equipment is routinely expected to not
only survive, but to work in environments in excess of 200°C, so that
2000 hours gets eaten up pretty quickly.

--
John Fields
Professional Circuit Designer

Besides the heat of drilling, what is the temperature at say 4000 feet?

 

[Don Bruder]

In article <1112986207.678226.45900@o13g2000cwo.googlegroups.com>,
"phaeton" <blahbleh666@hotmail.com> wrote:

Your accusation that i have been smoking Si?

Hey, I've heard that's good shit, man! Lemme know if you find enough to
spare so I can try some!

Don Bruder says:
Nothing of any significance at the level of "zoom" you're talking.

Oh I know.... any effect would be completely negligible, particularly
for this application. The clumping and aligning is what i was
visualizing, but i'm sure that the electrons would get pulled out of
this arrangement just the same when I threw the switch and turned the
circuit on.

Yep, that's pretty much what I'd expect, too.

I thought it was an interesting question

Indeed. Now one needs to figure out if it's a question that has an
answer with any meaning!

--
Don Bruder - dakidd@sonic.net - New Email policy in effect as of Feb. 21, 2004.
Short form: I'm trashing EVERY E-mail that doesn't contain a password in the
subject unless it comes from a "whitelisted" (pre-approved by me) address.
See <http://www.sonic.net/~dakidd/main/contact.html> for full details.

 

[Lord Garth]

"Don Bruder" <dakidd@sonic.net> wrote in message
news:h8B5e.13843$m31.135599@typhoon.sonic.net...

In article <1112986207.678226.45900@o13g2000cwo.googlegroups.com>,
"phaeton" <blahbleh666@hotmail.com> wrote:

Your accusation that i have been smoking Si?

Hey, I've heard that's good shit, man! Lemme know if you find enough to
spare so I can try some!

Oh man!!! Its got some epoxy and phenolic mixed in, Wait!!! I have
a 4" wafer of the pure stuff....monolithic, polished smooth. It'll cost
you though!!!! 1,0,0 crystal alignment so it snaps straight!!!

 

[Byron A Jeff]

In article <pan.2005.04.08.04.10.09.371226@comast.net>,
Bob Monsen <rcsurname@comast.net> wrote:

[Mucho Snippage]

Why they feel they need low
impedance for Vpp is beyond me, though. Usually, Vpp draws almost no
current, so the opamp by itself should work fine. Whatever.

Actually this is a driver for the 16CXXXX EPROM based parts. If you check
their programming specifications sheet (and I have recently on another
matter) you will find that the max current draw for Vpp is up to 50mA.

Hence the need for a low impeadance path.

My Trivial High Voltage Programmer follows your suggestion as I have
specifically targeted it for Flash parts. However it would need a much
lower impeadance path to work with EPROM based parts.

BAJ

 

[Lord Garth]

"phaeton" <blahbleh666@hotmail.com> wrote in message
news:1112990019.896425.221790@f14g2000cwb.googlegroups.com...

Lord Garth sez:

though most would understand the slightly obscure jest..... Lighten
up!

Of course! My mention of that above was completely tongue-in-cheek
Sorry if i seemed as if i were miffed about it, as that's not the
case... I'm typically easy-going and am quick to enjoy
jokes/puns/humour, etc... (after all, i was talking about eating
capacitors and soldering antidepressants).. It's cool man.. ;-)

car battery on a concrete surface

I've heard this one from a lot of people, but in each case i've asked
why that would happen. Nobody could explain it, they were just
repeating what they had heard. Sure enough, at the service station i
worked at several years ago there was a set of wooden "battery charging
trays" for keeping the batteries off the concrete shop floor while
charging or storing. When we had more than 4 batteries the shop
manager would set the batteries on metal coat hangers, as if the whole
1/8" of *STEEL* would make all the difference in the world....

I always thought this was B.S. but I've never had an otherwise healthy
car battery and properly calibrated concrete surface that i could spare
for a day or so to try it out. I could be wrong....

Ha! Hangers huh? Lets send him to electricity 101! Maybe the deal
with car batteries revolves around the cold soaking effect of sitting
on a slab. Then again, it could be the acid etching the concrete that
was the real reason this myth got started.

I took the battery from my neighbors car and her to a shop so as to test the
battery and to get a replacement with the exchange. I discovered that her
old battery had leaked on my carpeting in the hatchback area. The color was
okay but the plastic fibers had reacted and were clumped as if they were
glued.
I never did figure that out but now I have a liner that things like
batteries would
be placed upon.

 

[John Fields]

On 3 Apr 2005 21:28:02 -0700, grug2005@hotmail.com wrote:

Hi guys,

I'm a CS major, but an EE major at heart

I know how to build circuits, I use SPICE, but I am now trying to
figure out the more physical properties of devices.

As for capacitors, I know how to charge them, discharge them, use them
for timing circuits, etc.

However, I'd like to know what it actually means at the physical level.

For example:

Let's take a Cap rated at 35V, 100uf.

Let's apply a voltage source to it, say 10V - in other words, charge it
up

Taking another Cap that is exactly the same, and charge it with 20V.

Now, let's take a Cap rated at 35V, but has 1000uf capacity.

We charge with 10V as before to fully charge.

What I would like to know now is what is the difference between all
three Caps at the physical property level?

For example, the two 100uf caps are charged with different voltage
levels. What does that mean exactly? Does the one charged with 20V
have more electrons stored than the one charged with 10V? Or are they
at different energy levels? What gives?

The one with 1000uf certainly has more 'charge', but again, does the
mean more electrons?

---
No analogy is perfect, but let's say that instead of capacitors we
have three pitchers which are right circular cylinders: two with
volumes (capacitances) of 100cm^3, one with a volume of 1000cm^3, and
all three with heights (voltage ratings) of 35cm. Let's also say
we've attached identical pressure gauges (voltmeters) which read gage
pressures from zero g/cm˛ to 35g/cm˛ to the bottoms of the pitchers,
and that the pitchers are all empty (discharged) and resting on their
bottoms with the gauges reading zero.

Now let's say that we pour a fluid (charge) with a specific gravity of
1g/cm^3 into the first pitcher until its pressure gauge reads 10g/cm˛
(10V). Since the density of the fluid is 1g/cm^3, the height of the
fluid column will be 10cm, and the pitcher will be about 28.57% full.

If we now pour enough fluid into the second pitcher to cause its
pressure gauge to read 20g/cm˛, the height of the fluid column will be
20cm and the pitcher will be about 57.1% full, so the quantity of
fluid (charge) in the pitcher with the gauge reading twice the
pressure (charged to twice the voltage) will be double that of the
other pitcher.

Now let's pour enough fluid into the third pitcher to make its
pressure gauge read 10g/cm˛. As with the first pitcher, since the
density of the fluid is the same, the fluid column will be 10cm high,
but because the pitcher has a larger capacity it will contain more
fluid. How much more? Since the first pitcher had a capacity of
100cm^3 and the third pitcher a capacity ten times greater than that,
for the same height of column the third will contain ten times as much
fluid as the first.

So, since the quantity (Q)of fluid in the pitcher is going to depend
on the capacity (C) of the pitcher and the pressure (Voltage) exerted
by the fluid, we can write:


Q = CV


Where, for a capacitor,

Q = the quantity of charge in the capacitor in coulombs,
C = the capacitance of the capacitor in farads, and
V = the voltage across the capacitor in volts.

For the first capacitor, then:


Q = C * V = 100E-6F * 10V = 1E-3coul = 1 millicoulomb


for the second:


Q = C * V = 100E-6F * 20V = 2E-3coul = 2 millicoulomb


and for the third:


Q = C * V = 1000E-6F * 10V = 1E-2coul = 10 millicoulombs


Just like the fluid being poured into the pitchers was made out of
molecules, the fluid charging the capacitors will be made out of
electrons, with one coulomb of charge containing about 6.02E18
electrons.

--
John Fields
Professional Circuit Designer

 

[John Fields]

On Fri, 08 Apr 2005 19:36:30 GMT, "Lord Garth" <LGarth@Tantalus.net>
wrote:

"John Fields" <jfields@austininstruments.com> wrote in message
news:gjkd5112fk5577upjghkl1v8oe08n38p5p@4ax.com...
On 8 Apr 2005 07:09:46 -0700, mowhoong@hotmail.com (mowhoong) wrote:

Capacitor with a range of 105 Celsius & life 8000 hours? I am curious to
know
who will design a circuit put under such high temp. & only last for eight
thousend
hours, other component like plastic will also deform due to high temp.Do
you think
it make sense ? Can any person know the reason. Thanks.

---
_Only_ 8000 hours? Downhole equipment is routinely expected to not
only survive, but to work in environments in excess of 200°C, so that
2000 hours gets eaten up pretty quickly.

--
John Fields
Professional Circuit Designer

Besides the heat of drilling, what is the temperature at say 4000 feet?

---
Dunno...

--
John Fields
Professional Circuit Designer

 

[James Beck]

In article <1112991007.039095.50210@l41g2000cwc.googlegroups.com>,
bakechad@ameritech.net says...

I am new to electronics and am trying to wire a LED to light up when a
12V fan is on. I understand about using a resistor inline with a LED
that has a typical voltage of less than 12V.

My question is: "if I use a 12V LED like this

http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F011%5F006%5F001%5F000&product%5Fid=276%2D084#

Do I need to use a resistor in this situation?

Thanks


Sounds like it has the resistor already in there, so no, you don't need

to add one. That is assuming the RS info is correct.

Jim

 

[Lord Garth]

<bakechad@ameritech.net> wrote in message
news:1112991007.039095.50210@l41g2000cwc.googlegroups.com...

I am new to electronics and am trying to wire a LED to light up when a
12V fan is on. I understand about using a resistor inline with a LED
that has a typical voltage of less than 12V.

My question is: "if I use a 12V LED like this


http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F011%5F006%5F001%5F000&product%5Fid=276%2D084#

Do I need to use a resistor in this situation?

Thanks

In typical Rat Shack style, they don't really tell you what you need to know
BUT, no LED
I have ever seen drops 12 volts in forward bias (Vf). So this unit has a
dropping resistor
in the package which looks like you can see it through the case.

Don't let these guys rip you a new one! That red LED and resistor is poor
quality at best
50mcd at 45 degrees. Their cost is probably all of 2 cents. Get an LED
from some
broken item and connect up a scavenged resistor. The color of the LED makes
all the
difference to the Vf and that's the number needed to calculate the value you
need. For just
a quick test, pop on a 470 Ohm resistor and hook up to your 12 volts. WATCH
the
polarity, it is a DIODE after all!

470 Ohms is yellow violet brown

 

[Don Bruder]

In article <ZkB5e.8912$c76.7303@newssvr11.news.prodigy.com>,
"Lord Garth" <LGarth@Tantalus.net> wrote:

"Don Bruder" <dakidd@sonic.net> wrote in message
news:h8B5e.13843$m31.135599@typhoon.sonic.net...
In article <1112986207.678226.45900@o13g2000cwo.googlegroups.com>,
"phaeton" <blahbleh666@hotmail.com> wrote:

Your accusation that i have been smoking Si?

Hey, I've heard that's good shit, man! Lemme know if you find enough to
spare so I can try some!

Oh man!!! Its got some epoxy and phenolic mixed in, Wait!!! I have
a 4" wafer of the pure stuff....monolithic, polished smooth. It'll cost
you though!!!! 1,0,0 crystal alignment so it snaps straight!!!

Ooooooooooohhhhhh! Uncut! Wow! All I've ever seen was the stuff that was
already stepped on two or three times before it got to me. Yours has got
to be some seriously quality stuff, man!

How much ya want for just a taste?

--
Don Bruder - dakidd@sonic.net - New Email policy in effect as of Feb. 21, 2004.
Short form: I'm trashing EVERY E-mail that doesn't contain a password in the
subject unless it comes from a "whitelisted" (pre-approved by me) address.
See <http://www.sonic.net/~dakidd/main/contact.html> for full details.

 

[Bob Monsen]

On Fri, 08 Apr 2005 12:02:32 -0700, SklettTheNewb wrote:

Thanks Bob! I will try this out tonight, looks interesting.
The only component I don't recognize is the one in parallel to the LED
that says 100u, what is that?

THanks!

It is an inductor, 100uH.

Regards,
Bob Monsen