Op amps problem Gain Calculation

[JosephKK]

On Thu, 02 Jul 2009 23:22:36 -0700, Kai
<kai@thebarattheendoftheuniverse.org> wrote:

On Thu, 02 Jul 2009 22:13:37 -0700, "JosephKK"<quiettechblue@yahoo.com
wrote:

On Sat, 27 Jun 2009 22:27:01 -0700, Kai
kai@thebarattheendoftheuniverse.org> wrote:

On Sun, 28 Jun 2009 00:41:59 -0400, "Michael A. Terrell"
mike.terrell@earthlink.net> wrote:


Alicia wrote:

I'm here sometimes lurking with my boyfriend when he's off duty - we
like to see the jerk get more people mad at him. The fool you're
dealing with has annoyed my BF and he wants to be sure that a proper
apology is delivered. We did get a potential lead last week about a
similar loudmouth over at Jaynor that we're having checked out. In
the meantime, we do get a laugh from his threats and rants. Like you
said, he is a loser.


Make sure to shoot a clean video of the meeting. It should get a
million+ hits on YouTube: "Anonymous coward dies of a heart attack when
confronted in person!"

So, you also think it is OK to mutilate the corpse of an enemy
combatant? Quite a tell, Terrell.

How in hell did you get from filming a coward dying of fright to
mutilating a corpse? Do you like beating corpses?


If you had brains enough to know how to follow the situation, you would
know that the person the TerrellTard is talking to is a jackass that
claims to have cut off the dick of an enemy soldier and stuffed it down
his throat.

So it is about pathetic, characterless bastards that like mutilating
corpses, not me, you fucking idiot.

Come back when you actually can comment from knowing what is going on,
instead of from utter oblivion.

You be crazy. You attribute things said by one poster to another. I
have been here for years, long enough to fairly know what other
longtime posters here (s.e.d) are consistently about. You are a know
nothing newcomer nobody by comparison here.

 

[Norman Farnsworth]

On Sat, 04 Jul 2009 15:22:30 -0700,
"JosephKK"<quiettechblue@yahoo.com> wrote:

<<<<<Snip>>>>>

You be crazy. You attribute things said by one poster to another. I
have been here for years, long enough to fairly know what other
longtime posters here (s.e.d) are consistently about. You are a know
nothing newcomer nobody by comparison here.

Ah, but you must recognize that you are dealing with Archie - boy of
over 50 nyms, not including the more relevant ones bestowed upon him
by others (i.e., dimbulb, pińata, fuckwit, et al). Archie wil tell
you that he's benn here for many, many years - though there's no trace
of the foul-mouthed assface prior to 2007.

 

[RoyLFuchs]

On Sat, 04 Jul 2009 22:55:01 GMT, normfarnsworth@yahoo.com (Norman
Farnsworth) wrote:

On Sat, 04 Jul 2009 15:22:30 -0700,
"JosephKK"<quiettechblue@yahoo.com> wrote:

Snip

You be crazy. You attribute things said by one poster to another. I
have been here for years, long enough to fairly know what other
longtime posters here (s.e.d) are consistently about. You are a know
nothing newcomer nobody by comparison here.


Ah, but you must recognize that you are dealing with Archie - boy of
over 50 nyms, not including the more relevant ones bestowed upon him
by others (i.e., dimbulb, pińata, fuckwit, et al). Archie wil tell
you that he's benn here for many, many years - though there's no trace
of the foul-mouthed assface prior to 2007.

What we have here is no trace of intelligence in the Farnsworth
retard's skull cavity, albeit to small for human brains, has zero
intelligence in it.

Just because a total retard like you cannot find a post does not make
ANY statistic you tout, based on your stupid capacity to search, a valid
statistic.

Are you even capable of grasping that concept, boy? You retarded piece
of know nothing shit.

I'd thought that I had seen a lot of retarded twits in my life. Then
you came along, Farnsworth. You are about as fucking retarded as it
gets. The funny part is that you actually think you are intelligent.

 

[Norman farnsworth]

On Sat, 04 Jul 2009 19:32:19 -0700, RoyLFuchs
<RoyLFuchs@urfargingicehole.org> wrote:

On Sat, 04 Jul 2009 22:55:01 GMT, normfarnsworth@yahoo.com (Norman
Farnsworth) wrote:

On Sat, 04 Jul 2009 15:22:30 -0700,
"JosephKK"<quiettechblue@yahoo.com> wrote:

Snip

You be crazy. You attribute things said by one poster to another. I
have been here for years, long enough to fairly know what other
longtime posters here (s.e.d) are consistently about. You are a know
nothing newcomer nobody by comparison here.


Ah, but you must recognize that you are dealing with Archie - boy of
over 50 nyms, not including the more relevant ones bestowed upon him
by others (i.e., dimbulb, pińata, fuckwit, et al). Archie wil tell
you that he's benn here for many, many years - though there's no trace
of the foul-mouthed assface prior to 2007.


What we have here is no trace of intelligence in the Farnsworth
retard's skull cavity, albeit to small for human brains, has zero
intelligence in it.

Just because a total retard like you cannot find a post does not make
ANY statistic you tout, based on your stupid capacity to search, a valid
statistic.

Are you even capable of grasping that concept, boy? You retarded piece
of know nothing shit.

I'd thought that I had seen a lot of retarded twits in my life. Then
you came along, Farnsworth. You are about as fucking retarded as it
gets. The funny part is that you actually think you are intelligent.

You are an insignificant speck of rabid dog turd who thinks he knows
better than everyone else. You do not assface. Why is it that you
avoid commenting when you are proven wrong - which is most of the time
(hence your nyms, "Always Wrong" and "Dimbulb")? More than a couple
of people have found where you've stated you are celibate, yet you
refuse to talk about it. When I locate that statement, I'll piss all
over you for not owning up. I enjoy laughing at your feeble attempts
to avoid admitting mistakes. You're a foul-mouthed joke. You are
obviously a single boy, grossly overweight with very poor skin
conditions and bad body odor. Why don't you off yourself now and save
some annoyed husband, boyfriend or girlfriend the trouble when you
insult their significant other.

 

[RoyLFuchs]

On Mon, 06 Jul 2009 02:17:48 GMT, normfarnsworth3@yahoo.com (Norman
farnsworth) wrote:

You are an insignificant speck of rabid dog turd who thinks he knows
better than everyone else. You do not assface.

I know how long I have been posting in Usenet. You do not, yet you
think you do. That is a serious character flaw, you retarded twit. You
sport several others as well, however. This post you made here exposes
at least one other. I'll let you figure out which, unless you are simply
too retarded.

Why is it that you
avoid commenting when you are proven wrong - which is most of the time
(hence your nyms, "Always Wrong" and "Dimbulb")?

I have no such nyms, idiot. Cite a single post where I used either.
You cannot. Why? Aside from you being a retard? There are none!
Pretty simple shit, dog turd boy.

More than a couple
of people have found where you've stated you are celibate, yet you
refuse to talk about it.

Again... CITE the post you refer to or shut the fuck up, BOY!

When I locate that statement, I'll piss all
over you for not owning up.

I hope that you waste inordinate hours of your pathetic life doing just
that. You prove the simplest of things like how I have done more to make
the world a better place than a retarded, post hunting dumbfuck retard
like you ever will.

The time you waste hunting up posts is 100% indicative of the waste of
time that your entire pathetic life is.

Your mother should be a jailed felon for life for the crime of not
flushing the piece of shit that you are, Farnsworth, the very moment she
shat you from her retarded ass.

Now, be a good little retarded fuck and run off somewhere and die. Be
sure to realize just how much of your personal time you have wasted with
your baby bullshit Usenet presence.

I enjoy laughing at your feeble attempts
to avoid admitting mistakes.

Can you even produce a citation for that, or are you simply a total
retard with a keyboard in front of you?

You're a foul-mouthed joke.

You're just a foul joke, at best.

You are
obviously a single boy,

How would you know? I have been here for fifty years. I could screw at
20 better than you ever will. I can screw at 50 better than you ever will
as well.

You're pretty much screwed, boy.

grossly overweight

I'll bet that you have spent more years of your life with a spare tire
than I ever have or ever will. Even at 50, I can only pinch a slight bit
more than an inch, and that ain't bad, considering all the pizzas and
steaks. In other words, you're still a goddamned guess as you go retard.

with very poor skin

My skin is fine. Yours deserves the hellraiser treatment.

conditions and bad body odor.

Unlike you I do take daily showers, and even more if I work out while I
am at work. We have a gym, and a continuous fitness club membership as
part of our benefits package.

You likely have parts that all weigh more than mine, except for your
skull cavity, and your lower nib.

Why don't you off yourself now and save
some annoyed husband, boyfriend or girlfriend the trouble when you
insult their significant other.

If their "other" mouths off, I will not hesitate to put them in their
place. Same thing for the husband.

Do you have any more retarded drivel, you pussy? Bwuahahahahhaa!

 

[Norman Farnsworth]

On Mon, 06 Jul 2009 02:56:07 -0700, RoyLFuchs
<RoyLFuchs@urfargingicehole.org> wrote:

I know how long I have been posting in Usenet.
Bullshit. You are a fucking liar who claims to have been here longer

that you actually have.

I have no such nyms, idiot.
Bullshit. Your only true nyms are "Always Wrong" and "Dimbulb". The

other 50+ are just your made up alter egos that are your sole way for
make believe interaction with others. You talk to yourself just as
you play with yourself. Real people avoid you like a plague.

Again... CITE the post you refer to or shut the fuck up, BOY!
Bullshit. You said it and you do not DARE to deny it because you

could never withstand the shitstorm that would follow your denial.
Get over your "cite" nonsense. Confirm or deny asshole - there's
nothing more to be said. And your black brothers may not appreciate
your exaggerated use of the term "BOY".

Can you even produce a citation for that, or are you simply a total
retard with a keyboard in front of you?
Did you, or did you not make the 100% erroneous statement that methane

and methanol are identical and that both are alcohols? Let's see you
try to weasel out of this one, BOY. A simple statement that you were
wrong will suffice.

I have been here for fifty years. I could screw at 20 better than you ever will.
I can screw at 50 better than you ever will as well.
Bullshit. A celibate individual, even an asshole like you, would

never even make such a claim - even including your inflatable friends.
Besides, your Usenet activities reveal that you are completely devoid
of the consoling or socializing presence of a woman. No female would
put up with your pitiful presence.

Even at 50, I can only pinch a slight bit more than an inch
You are clearly referring to the times when you are yanking your puny

crank.

My skin is fine.
Not even your foreskin is fine. You are a pus dripping slug who makes

Jabba the Hutt appear smooth and refined.

I do take daily showers, and even more if I work out while I
am at work.
Your working out is pulling your pud - and you've been admonished a

number of times not to do that on the job. You've also been warned
not to use a computer at work to post on Usenet. Lauer has spoken.

If their "other" mouths off, I will not hesitate to put them in their
place. Same thing for the husband.
And that will quite possibly lead to your being fully outed on Usenet

and being spanked in public. Your ego will never survive it.



Bwuahahahahhahahahahahahahahahahahahahahahahahaha!

 

[Peter]

On Jul 6, 5:56 am, RoyLFuchs <RoyLFu...@urfargingicehole.org> wrote:

On Mon, 06 Jul 2009 02:17:48 GMT, normfarnswor...@yahoo.com (Norman

farnsworth) wrote:
You are an insignificant speck of rabid dog turd who thinks he knows
better than everyone else.  You do not assface.

 I know how long I have been posting in Usenet.  You do not, yet you
think you do. That is a serious character flaw, you retarded twit.  You
sport several others as well, however.  This post you made here exposes
at least one other. I'll let you figure out which, unless you are simply
too retarded.

 Why is it that you
avoid commenting when you are proven wrong - which is most of the time
(hence your nyms, "Always Wrong" and "Dimbulb")?

  I have no such nyms, idiot.  Cite a single post where I used either..
You cannot.  Why?  Aside from you being a retard?  There are none!
Pretty simple shit, dog turd boy.

 More than a couple
of people have found where you've stated you are celibate, yet you
refuse to talk about it.

  Again... CITE the post you refer to or shut the fuck up, BOY!

 When I locate that statement, I'll piss all
over you for not owning up.

  I hope that you waste inordinate hours of your pathetic life doing just
that.  You prove the simplest of things like how I have done more to make
the world a better place than a retarded, post hunting dumbfuck retard
like you ever will.

  The time you waste hunting up posts is 100% indicative of the waste of
time that your entire pathetic life is.

  Your mother should be a jailed felon for life for the crime of not
flushing the piece of shit that you are, Farnsworth, the very moment she
shat you from her retarded ass.

  Now, be a good little retarded fuck and run off somewhere and die.  Be
sure to realize just how much of your personal time you have wasted with
your baby bullshit Usenet presence.

 I enjoy laughing at your feeble attempts
to avoid admitting mistakes.

 Can you even produce a citation for that, or are you simply a total
retard with a keyboard in front of you?

 You'rea foul-mouthed joke.

  You'rejust a foul joke, at best.

 You are
obviously a single boy,

 How would you know?  I have been here for fifty years. I could screw at
20 better than you ever will. I can screw at 50 better than you ever will
as well.

 You'repretty much screwed, boy.

grossly overweight

  I'll bet that you have spent more years of your life with a spare tire
than I ever have or ever will.  Even at 50, I can only pinch a slight bit
more than an inch, and that ain't bad, considering all the pizzas and
steaks.  In other words, you'restill a goddamned guess as you go retard..

with very poor skin

 My skin is fine. Yours deserves the hellraiser treatment.

conditions and bad body odor.

 Unlike you I do take daily showers, and even more if I work out while I
am at work.  We have a gym, and a continuous fitness club membership as
part of our benefits package.

 You likely have parts that all weigh more than mine, except for your
skull cavity, and your lower nib.

 Why don't you off yourself now and save
some annoyed husband, boyfriend or girlfriend the trouble when you
insult their significant other.

 If their "other" mouths off, I will not hesitate to put them in their
place. Same thing for the husband.

  Do you have any more retarded drivel, you pussy? Bwuahahahahhaa!

Right on Norman! That's telling the fat slob liar off. I sent you
info for his statement of celibacy. However, I suggest that you do
not shove it under his nose. Let him continue to wonder about all of
the people here who have already told him that they've seen it for
themselves. All he ever says about it is 'cite" - and none of us have
ever done it. We all try to get him to deny that he claimed to be
celibate so we con reveal how full of crap he is. He doesn't see wh
conclusions his refusal to deny lead to. What a loser. Wait until
his contact information is posted and he starts to get email from all
of the lurkers here. There are many of them who hardly ever post, but
who would delight in being able to let this pig know what he really
looks like on Usenet.

 

[Bart!]

On Mon, 6 Jul 2009 10:31:44 -0700 (PDT), Peter <peterchoward69@gmail.com>
wrote:

On Jul 6, 5:56 am, RoyLFuchs <RoyLFu...@urfargingicehole.org> wrote:
On Mon, 06 Jul 2009 02:17:48 GMT, normfarnswor...@yahoo.com (Norman

farnsworth) wrote:
You are an insignificant speck of rabid dog turd who thinks he knows
better than everyone else.  You do not assface.

 I know how long I have been posting in Usenet.  You do not, yet you
think you do. That is a serious character flaw, you retarded twit.  You
sport several others as well, however.  This post you made here exposes
at least one other. I'll let you figure out which, unless you are simply
too retarded.

 Why is it that you
avoid commenting when you are proven wrong - which is most of the time
(hence your nyms, "Always Wrong" and "Dimbulb")?

  I have no such nyms, idiot.  Cite a single post where I used either.
You cannot.  Why?  Aside from you being a retard?  There are none!
Pretty simple shit, dog turd boy.

 More than a couple
of people have found where you've stated you are celibate, yet you
refuse to talk about it.

  Again... CITE the post you refer to or shut the fuck up, BOY!

 When I locate that statement, I'll piss all
over you for not owning up.

  I hope that you waste inordinate hours of your pathetic life doing just
that.  You prove the simplest of things like how I have done more to make
the world a better place than a retarded, post hunting dumbfuck retard
like you ever will.

  The time you waste hunting up posts is 100% indicative of the waste of
time that your entire pathetic life is.

  Your mother should be a jailed felon for life for the crime of not
flushing the piece of shit that you are, Farnsworth, the very moment she
shat you from her retarded ass.

  Now, be a good little retarded fuck and run off somewhere and die.  Be
sure to realize just how much of your personal time you have wasted with
your baby bullshit Usenet presence.

 I enjoy laughing at your feeble attempts
to avoid admitting mistakes.

 Can you even produce a citation for that, or are you simply a total
retard with a keyboard in front of you?

 You'rea foul-mouthed joke.

  You'rejust a foul joke, at best.

 You are
obviously a single boy,

 How would you know?  I have been here for fifty years. I could screw at
20 better than you ever will. I can screw at 50 better than you ever will
as well.

 You'repretty much screwed, boy.

grossly overweight

  I'll bet that you have spent more years of your life with a spare tire
than I ever have or ever will.  Even at 50, I can only pinch a slight bit
more than an inch, and that ain't bad, considering all the pizzas and
steaks.  In other words, you'restill a goddamned guess as you go retard.

with very poor skin

 My skin is fine. Yours deserves the hellraiser treatment.

conditions and bad body odor.

 Unlike you I do take daily showers, and even more if I work out while I
am at work.  We have a gym, and a continuous fitness club membership as
part of our benefits package.

 You likely have parts that all weigh more than mine, except for your
skull cavity, and your lower nib.

 Why don't you off yourself now and save
some annoyed husband, boyfriend or girlfriend the trouble when you
insult their significant other.

 If their "other" mouths off, I will not hesitate to put them in their
place. Same thing for the husband.

  Do you have any more retarded drivel, you pussy? Bwuahahahahhaa!

Right on Norman! That's telling the fat slob liar off. I sent you
info for his statement of celibacy. However, I suggest that you do
not shove it under his nose. Let him continue to wonder about all of
the people here who have already told him that they've seen it for
themselves. All he ever says about it is 'cite" - and none of us have
ever done it. We all try to get him to deny that he claimed to be
celibate so we con reveal how full of crap he is. He doesn't see wh
conclusions his refusal to deny lead to. What a loser. Wait until
his contact information is posted and he starts to get email from all
of the lurkers here. There are many of them who hardly ever post, but
who would delight in being able to let this pig know what he really
looks like on Usenet.

I noticed that ALL of you idiots were to much of a wimp to answer the
poll. That's a real tell.

I'll bet your ugly old lady weighs twice what I weigh, Choward.

Telling me off? Bwuahahahahahahaha! That's a laugh.

 

[Richard Cranium]

On Tue, 07 Jul 2009 00:48:29 -0700, Bart!
<B@rt_The_Sheriff_Is_A_Nig**!.org> wrote:

<<<<<Snip>>>>>

I'll bet your ugly old lady weighs twice what I weigh, Choward.

Telling me off? Bwuahahahahahahaha! That's a laugh.

First of all, at least he HAS an "old lady" - and you have no concept
of her or any other female's anatomy (the sole exception being your
peeks at mommy taking a dump through the crack in the bathroom door
jamb). All you have is your right hand - which weighs in at more than
most size-7 women. Furthermore, it's pretty clear that he did tell
you off nicely. Your "Bwuahahahaha" is quite muted as you do
recognize that you've been dumped upon again. You are a loser; that's
all there is to it.

 

[Kyle Schwitters]

Withe the capability of tossing billions of dollars at lawyers to
defend against monopoly charges, Microsoft can easily ride the waves
of global competition and non-innovation.

 

[Lykmi Pusi]

Business Digest

The Washington Post
Saturday, July 25, 2009


"Microsoft Tries to End E.U. Antitrust Case"


MICROSOFT WILL OFFER offer computer users a choice of Web browsers to
ward off new European Union antitrust fines, E.U. regulators said.

The European Commission has charged the company with monopoly abuse
for tying the Internet Explorer browser to the Windows operating
system installed on most of the world's desktop computers.

Microsoft is suggesting that people pick a browser from several
offered in its new software release, Windows 7, which will go on sale
Oct. 22. Windows would still include Internet Explorer, but users
would be able to disable it. Computer manufacturers could also choose
to install other browsers.

-- Associated Press

http://www.washingtonpost.com/wp-dyn/content/article/2009/07/24/AR2009072403767.html

 

[Shawn Hirn]

In article
<9ecd4d88-da42-4fc3-a20b-18fe63106b20@h21g2000yqa.googlegroups.com>,
Kyle Schwitters <slipuvalad@yahoo.com> wrote:

Withe the capability of tossing billions of dollars at lawyers to
defend against monopoly charges, Microsoft can easily ride the waves
of global competition and non-innovation.

Really? Microsoft has been losing those cases.

 

[geoff]

Jennifer Fitzgerald wrote:


Really ? My MS products that I use now are miles ahead of what they were in
1999.

geoff

 

[Shawn Hirn]

In article <QbGdnVmXgoFMcPHXnZ2dnVY3goWdnZ2d@giganews.com>,
"geoff" <geoff@nospam-paf.co.nz> wrote:

Jennifer Fitzgerald wrote:


Really ? My MS products that I use now are miles ahead of what they were in
1999.

geoff

The GUI has changed only moderately. The same paradigm with Windows
Vista can be found with Windows 3.1, but with more flashy icons in Vista.

 

[Rod Speed]

Shawn Hirn wrote

geoff <geoff@nospam-paf.co.nz> wrote
Jennifer Fitzgerald wrote

Really ? My MS products that I use now are miles ahead of what they were in 1999.

The GUI has changed only moderately.

There's a hell of a lot more involved than just the gui.

The same paradigm with Windows Vista can be found
with Windows 3.1, but with more flashy icons in Vista.

There's a hell of a lot more differences between Windows 3.1 and Vista than just 'flashy icons'

 

[vict0r]

"Kyle Schwitters" <slipuvalad@yahoo.com> wrote in message
news:9ecd4d88-da42-4fc3-a20b-18fe63106b20@h21g2000yqa.googlegroups.com...

Withe the capability of tossing billions of dollars at lawyers to
defend against monopoly charges, Microsoft can easily ride the waves
of global competition and non-innovation.

"I recently spoke with an IT manager who was budgeting for an Office 2010
upgrade from Office 2003. I casually asked him what features he had deemed
important enough to justify a $100,000 budget item. He thought for a minute
and admitted that he couldn't think of a single one. So I asked the logical
follow-up: Why are you buying it? He had no answer for that either. The
$100,000 line item disappeared. He's also sticking with [Windows] XP."

http://www.pcworld.com/businesscenter/article/168336/sixty_percent_of_companies_not_moving_to_windows_7.html

 

[Dan Barlow]

roll wrote:

Hi,
does anyone knows where i can find (buy) an 2 axis potentiometer 20K?
Roland

joystick guts surplus.

http://home.labridge.com/~wnoble/forsale/Computer_HW_For_Sale.html

 

[Dan Barlow]

Synaptic Flow wrote:

Hi, I've been given a digital camera to see if I can repair it, had a bit of
a drop. The only thing I can find wrong with it is the built in flash bulb
has become detatched at one end, looks like a bit of a tricky soldering job
but achievable. Question is, is there place I might be able to get a
replacement if this one's vacuum has been punctured/filiment damaged & if
so, how do I go about judging which rating to replace it with?

They're rated in watt-seconds, and any the same length should be a very
similar capacity. I recommend disposable cameras with flash, you can
take them apart yourself after taking all the shots. The film rolls
back into a can as you wind it, so you won't damage it. Any film place
will accept the can for processing, and then you have a free flash
assembly good for making slave flashes or strobes. Some drug store
film places will sell you the empty cameras with flash for $0.25 each.
-Dan Barlow

 

[Synaptic Flow]

"Dan Barlow" <danbarlow@radix.net> wrote in message
news:3ef778ee_2@vienna7.his.com...

Synaptic Flow wrote:
Hi, I've been given a digital camera to see if I can repair it, had a
bit of
a drop. The only thing I can find wrong with it is the built in flash
bulb
has become detatched at one end, looks like a bit of a tricky soldering
job
but achievable. Question is, is there place I might be able to get a
replacement if this one's vacuum has been punctured/filiment damaged &
if
so, how do I go about judging which rating to replace it with?

They're rated in watt-seconds, and any the same length should be a very
similar capacity. I recommend disposable cameras with flash, you can
take them apart yourself after taking all the shots. The film rolls
back into a can as you wind it, so you won't damage it. Any film place
will accept the can for processing, and then you have a free flash
assembly good for making slave flashes or strobes. Some drug store
film places will sell you the empty cameras with flash for $0.25 each.
-Dan Barlow

Thanks, I've got a couple of old fixed focus units hanging around that could
act for donor

 

[default]

If the tach is supposed to help in traction control (input a signal to
the traction motors) the bike tach is useless. RPM from a bike tach
is cheap dirty and easy - as long as you don't care about absolute
values (relative values instead). It is a good solution: cheap dirty
and already made.

The neatest solution to me (assuming your hobby car uses electric
motors) would be to amplify the signal produced by the motors
themselves. AC couple the signal from the motor amplify it, if
necessary, then just use it to work a tachometer IC like the National
LM2917. The tach circuit shown in the National literature shows a
circuit that biases the LM2917 so it triggers an next to nothing (like
the ripple your traction motors create)

Look at the high side motor brush with a scope. Look at the ripple.
If it is greater than .1 volts (AC coupled scope) then it is enough to
work the tack IC, directly.

Use a gas engine and you can couple via the spark.

I tried the spark but with only one pulse per revolution the
integrating cap was so large that I only dislplayed what the RPM
average was three seconds ago - not good enough for a bike.

I just finished a tach for my motorcyle and used the signal from the
alternator. Works well (twelve pulses per revolution - puts out 30
volts I need <.1 to trigger the LM2917 / LM2907.

Output of the 2917 is a analog voltage/current suitable for a meter or
further signal and control processing.

On 24 Jun 2003 10:49:27 -0700, mlt3@lehigh.edu (miketinte) wrote:

Hey everyone,

I'm trying to build a traction control system for a small (but
rideable) hobby car. I've been looking for OEM bicycle tachometers,
but haven't been too successful. I was thinking about using small
hobby motors connected to the wheels so they'll spin at the same RPMs,
then just amp that signal and run through a comparator...? Would this
work well (or at all)? If not, does anyone know where I can get some
bike tachs without all the bells and whistles.

Thanks,
Mike

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