Potentiometer question

[billshat44@yahoo.com]

How do you decide what pot to use from the eagle cadsoft library? I
need to use a 2k board mount pot and would like to know the secret to
picking the correct pot with the correct size for what I want to do.
For example, I looked up the CA9V pot on the internet, but couldn't
find what size it was. Do you print out the pots and manually place
the pots on the page until you find the right size?

I looked on the Cadsfot Forum for the answer, but evidently everyone
else has figured this out,. Thanks

 

[Eeyore]

"billshat44@yahoo.com" wrote:

How do you decide what pot to use from the eagle cadsoft library?

Presumably in the same way you'd choose one in real life.

How complicated can that be ? <shakes head at newbie graduate ignorance>

Once upon a time it was expected that kids going through Uni might at
least have at least half a clue about the components they might
encounter.

This is one reason why companies don't especially rate graduates for
practical intelligence any more.


Graham

 

[Eeyore]

"billshat44@yahoo.com" wrote:

Do you print out the pots and manually place
the pots on the page until you find the right size?

Can you wipe your own backside ? It's kinda the same thing.

Graham

 

[Tim Wescott]

billshat44@yahoo.com wrote:

How do you decide what pot to use from the eagle cadsoft library? I
need to use a 2k board mount pot and would like to know the secret to
picking the correct pot with the correct size for what I want to do.
For example, I looked up the CA9V pot on the internet, but couldn't
find what size it was. Do you print out the pots and manually place
the pots on the page until you find the right size?

I looked on the Cadsfot Forum for the answer, but evidently everyone
else has figured this out,. Thanks

If you buy parts from a decent vendor (such as Digikey or Mouser) there

will be links to data sheets, or at least the manufacturer's web site.
So you dig out the data sheet, and you compare the part footprint to the
part in Eagle.

If you _must_ buy a budget part, you buy it, and with the part in one
hand and a pair of calipers in the other you measure it up and decide on
a footprint.

Better yet, you decide on the part that works for you, then you build
the part footprint in a library so you know it's right.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

 

[Eeyore]

Tim Wescott wrote:

billshat44@yahoo.com wrote:
How do you decide what pot to use from the eagle cadsoft library? I
need to use a 2k board mount pot and would like to know the secret to
picking the correct pot with the correct size for what I want to do.
For example, I looked up the CA9V pot on the internet, but couldn't
find what size it was. Do you print out the pots and manually place
the pots on the page until you find the right size?

I looked on the Cadsfot Forum for the answer, but evidently everyone
else has figured this out,. Thanks

If you buy parts from a decent vendor (such as Digikey or Mouser) there
will be links to data sheets, or at least the manufacturer's web site.
So you dig out the data sheet, and you compare the part footprint to the
part in Eagle.

If you _must_ buy a budget part, you buy it, and with the part in one
hand and a pair of calipers in the other you measure it up and decide on
a footprint.

Better yet, you decide on the part that works for you, then you build
the part footprint in a library so you know it's right.

And just make sure you don't reverse the X orY dims or you'll feel a right
prick.

Understanding engineering drawings is VERY important for this.

Graham

 

[Eeyore]

"billshat44@yahoo.com" wrote:

I really hadn't expected this kind of response to a serious question.
I don't have a formal education in electronics, but am very interested
in building some projects for a hobby that I enjoy.

Might have been better had you indictated your level of expertise in that
case.

Trust me, you get ppl who've been (allegedly) doing this 10 yrs or more
asking you to wipe their bottoms and it gets tedious.

If you can read a technical drawing you shouldn't have any trouble. Best
of all, get a sample part to confirm the dimensions and pinout.

Graham

 

[Rich Webb]

On Tue, 10 Jun 2008 10:32:31 -0700 (PDT), "billshat44@yahoo.com"
<billshat44@yahoo.com> wrote:

I really hadn't expected this kind of response to a serious question.

"Eeyore" is occasionally unsure on the concept of "basics." He's
generally harmless, like the old guy in the corner who wakes up,
shouts "What about '56, you arseholes?!" and then nods off again.

I don't have a formal education in electronics, but am very interested
in building some projects for a hobby that I enjoy.
Perhaps I didn't phrase my question correctly, or "eeyore" is exactly
what you are but whatever the reason you decided to flame me for is
total uncalled for.

See above.

I already have some board mounted pots that I can use for my
project, but there are no markings on the pots to tell me who the
manufacturer is or any other information that I could cross reference
to information on the internet. The pots in the library do not show
the pin spacing sizes. My question was how do the people of this
group determine what size of pot they are going to use.

Pretty much like Tim outlined:
1. Either
1.a. Go to Digikey/Mouser/Allied/etc. to see what's really available,
in what quantities, and with what specs.
1.b. (Mostly for one-offs) Pull open the parts drawer labeled "Pots"
to see what's on-hand and good enough.
2. If there's not a matching footprint in the PCB layout library, use
the part's datasheet or on the spot measurements to create one.

--
Rich Webb Norfolk, VA

 

[Eeyore]

"billshat44@yahoo.com" wrote:.

I already have some board mounted pots that I can use for my
project, but there are no markings on the pots to tell me who the
manufacturer is or any other information that I could cross reference
to information on the internet.

So how the heck do you know in which orientation they work ?

Is clockwise rotation positive or negative function for example ?

Graham

 

[billshat44@yahoo.com]

I really hadn't expected this kind of response to a serious question.
I don't have a formal education in electronics, but am very interested
in building some projects for a hobby that I enjoy.
Perhaps I didn't phrase my question correctly, or "eeyore" is exactly
what you are but whatever the reason you decided to flame me for is
total uncalled for.
I already have some board mounted pots that I can use for my
project, but there are no markings on the pots to tell me who the
manufacturer is or any other information that I could cross reference
to information on the internet. The pots in the library do not show
the pin spacing sizes. My question was how do the people of this
group determine what size of pot they are going to use. There are
several different pad layouts for pots. I thought the name of this
group was sci.electronics.basics not lets.make,fun.of other.people

Eeyore wrote:

"billshat44@yahoo.com" wrote:

Do you print out the pots and manually place
the pots on the page until you find the right size?

Can you wipe your own backside ? It's kinda the same thing.

Graham

 

[Eeyore]

Rich Webb wrote:

"billshat44@yahoo.com" <billshat44@yahoo.com> wrote:

I really hadn't expected this kind of response to a serious question.

"Eeyore" is occasionally unsure on the concept of "basics." He's
generally harmless, like the old guy in the corner who wakes up,
shouts "What about '56, you arseholes?!" and then nods off again.

Nah, I'm only 54 next week silly.

I have a big bark but if you actually ask sensible questions, I'll help you
to the end of the earth.

I do have a problem with fuckwits though.

Graham

 

[Eeyore]

Eeyore wrote:

"billshat44@yahoo.com" wrote:.

I already have some board mounted pots that I can use for my
project, but there are no markings on the pots to tell me who the
manufacturer is or any other information that I could cross reference
to information on the internet.

So how the heck do you know in which orientation they work ?

Is clockwise rotation positive or negative function for example ?

p.s. BIG HINT.

Guys who do this all the time know how to deal with that. Positive
application of the brain is a wonderful thing.

Graham

 

[Tim Wescott]

Eeyore wrote:

Tim Wescott wrote:

billshat44@yahoo.com wrote:
How do you decide what pot to use from the eagle cadsoft library? I
need to use a 2k board mount pot and would like to know the secret to
picking the correct pot with the correct size for what I want to do.
For example, I looked up the CA9V pot on the internet, but couldn't
find what size it was. Do you print out the pots and manually place
the pots on the page until you find the right size?

I looked on the Cadsfot Forum for the answer, but evidently everyone
else has figured this out,. Thanks

If you buy parts from a decent vendor (such as Digikey or Mouser) there
will be links to data sheets, or at least the manufacturer's web site.
So you dig out the data sheet, and you compare the part footprint to the
part in Eagle.

If you _must_ buy a budget part, you buy it, and with the part in one
hand and a pair of calipers in the other you measure it up and decide on
a footprint.

Better yet, you decide on the part that works for you, then you build
the part footprint in a library so you know it's right.

And just make sure you don't reverse the X orY dims or you'll feel a right
prick.

Understanding engineering drawings is VERY important for this.

The very first board I ever laid out during my time as a teacher's

assistant for a high school shop class.

I mirrored it.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html

 

[Don Bowey]

On 6/10/08 10:59 AM, in article 484EC10B.34025CA8@hotmail.com, "Eeyore"
<rabbitsfriendsandrelations@hotmail.com> wrote:

"billshat44@yahoo.com" wrote:

I really hadn't expected this kind of response to a serious question.
I don't have a formal education in electronics, but am very interested
in building some projects for a hobby that I enjoy.

Might have been better had you indictated your level of expertise in that
case.

Trust me, you get ppl who've been (allegedly) doing this 10 yrs or more
asking you to wipe their bottoms and it gets tedious.

If you can read a technical drawing you shouldn't have any trouble. Best
of all, get a sample part to confirm the dimensions and pinout.

Graham

Say, jackass, (not donkey), keep in mind that the topic here is "basics."
The OP asked a confusing question, but that's not a good reason to flex your
flabby muscles.

 

[Eeyore]

Tim Wescott wrote:

Eeyore wrote:
Tim Wescott wrote:
billshat44@yahoo.com wrote:
How do you decide what pot to use from the eagle cadsoft library? I
need to use a 2k board mount pot and would like to know the secret to
picking the correct pot with the correct size for what I want to do.
For example, I looked up the CA9V pot on the internet, but couldn't
find what size it was. Do you print out the pots and manually place
the pots on the page until you find the right size?

I looked on the Cadsfot Forum for the answer, but evidently everyone
else has figured this out,. Thanks

If you buy parts from a decent vendor (such as Digikey or Mouser) there
will be links to data sheets, or at least the manufacturer's web site.
So you dig out the data sheet, and you compare the part footprint to the
part in Eagle.

If you _must_ buy a budget part, you buy it, and with the part in one
hand and a pair of calipers in the other you measure it up and decide on
a footprint.

Better yet, you decide on the part that works for you, then you build
the part footprint in a library so you know it's right.

And just make sure you don't reverse the X orY dims or you'll feel a right
prick.

Understanding engineering drawings is VERY important for this.

The very first board I ever laid out during my time as a teacher's
assistant for a high school shop class.

I mirrored it.

Well .... in the early days, that was often the preferred method.

No longer, it's 'top-side view' as the norm.

Graham

 

[Eeyore]

Bob Eld wrote:

I would help you with the pot question but thought it specific to Eagle
Cadsoft so didn't respond, not knowing Eagle.

The specific CAD package is almost irrelevant though why in hell anyone would
willingly use Eagle is quite beyond me.

Graham

 

[Rich Webb]

On Tue, 10 Jun 2008 20:42:33 +0100, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

Rich Webb wrote:

"billshat44@yahoo.com" <billshat44@yahoo.com> wrote:

I really hadn't expected this kind of response to a serious question.

"Eeyore" is occasionally unsure on the concept of "basics." He's
generally harmless, like the old guy in the corner who wakes up,
shouts "What about '56, you arseholes?!" and then nods off again.

Nah, I'm only 54 next week silly.

Oy! I do apologize, then. Yer just a wee lad ... (compared to some of
the fossils around here) but I've got a couple of years on ya. ;-)

--
Rich Webb Norfolk, VA

 

[Eeyore]

Don Bowey wrote:

"Eeyore" wrote:
"billshat44@yahoo.com" wrote:

I really hadn't expected this kind of response to a serious question.
I don't have a formal education in electronics, but am very interested
in building some projects for a hobby that I enjoy.

Might have been better had you indictated your level of expertise in that
case.

Trust me, you get ppl who've been (allegedly) doing this 10 yrs or more
asking you to wipe their bottoms and it gets tedious.

If you can read a technical drawing you shouldn't have any trouble. Best
of all, get a sample part to confirm the dimensions and pinout.

Say, jackass, (not donkey), keep in mind that the topic here is "basics."
The OP asked a confusing question, but that's not a good reason to flex your
flabby muscles.

Actually, it's the best answer anyone has so far given, not least the idea of
getting a sample part to check form and fit.

And if you want to check my muscles out, you're more than welcome any time. Even
punks think twice before looking at me.

Graham

 

[Jamie]

billshat44@yahoo.com wrote:

I really hadn't expected this kind of response to a serious question.
I don't have a formal education in electronics, but am very interested
in building some projects for a hobby that I enjoy.
Perhaps I didn't phrase my question correctly, or "eeyore" is exactly
what you are but whatever the reason you decided to flame me for is
total uncalled for.
I already have some board mounted pots that I can use for my
project, but there are no markings on the pots to tell me who the
manufacturer is or any other information that I could cross reference
to information on the internet. The pots in the library do not show
the pin spacing sizes. My question was how do the people of this
group determine what size of pot they are going to use. There are
several different pad layouts for pots. I thought the name of this
group was sci.electronics.basics not lets.make,fun.of other.people

Eeyore wrote:

"billshat44@yahoo.com" wrote:


Do you print out the pots and manually place
the pots on the page until you find the right size?

Can you wipe your own backside ? It's kinda the same thing.

Graham

Oh don't let it bother you, We have some rather ill mannered posters
here that don't think their shit stinks!. Most of them come from the
UK district!

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

 

[Don Bowey]

On 6/10/08 2:36 PM, in article 484EF3EE.91E2936E@hotmail.com, "Eeyore"
<rabbitsfriendsandrelations@hotmail.com> wrote:

Don Bowey wrote:

"Eeyore" wrote:
"billshat44@yahoo.com" wrote:

I really hadn't expected this kind of response to a serious question.
I don't have a formal education in electronics, but am very interested
in building some projects for a hobby that I enjoy.

Might have been better had you indictated your level of expertise in that
case.

Trust me, you get ppl who've been (allegedly) doing this 10 yrs or more
asking you to wipe their bottoms and it gets tedious.

If you can read a technical drawing you shouldn't have any trouble. Best
of all, get a sample part to confirm the dimensions and pinout.

Say, jackass, (not donkey), keep in mind that the topic here is "basics."
The OP asked a confusing question, but that's not a good reason to flex your
flabby muscles.

Actually, it's the best answer anyone has so far given, not least the idea of
getting a sample part to check form and fit.

And if you want to check my muscles out, you're more than welcome any time.
Even punks think twice before looking at me.

Graham

I'm sure one look would cause anyone to not want to look again.

 

[Jamie]

Eeyore wrote:

Tim Wescott wrote:


billshat44@yahoo.com wrote:

How do you decide what pot to use from the eagle cadsoft library? I
need to use a 2k board mount pot and would like to know the secret to
picking the correct pot with the correct size for what I want to do.
For example, I looked up the CA9V pot on the internet, but couldn't
find what size it was. Do you print out the pots and manually place
the pots on the page until you find the right size?

I looked on the Cadsfot Forum for the answer, but evidently everyone
else has figured this out,. Thanks


If you buy parts from a decent vendor (such as Digikey or Mouser) there
will be links to data sheets, or at least the manufacturer's web site.
So you dig out the data sheet, and you compare the part footprint to the
part in Eagle.

If you _must_ buy a budget part, you buy it, and with the part in one
hand and a pair of calipers in the other you measure it up and decide on
a footprint.

Better yet, you decide on the part that works for you, then you build
the part footprint in a library so you know it's right.


And just make sure you don't reverse the X orY dims or you'll feel a right
prick.

Understanding engineering drawings is VERY important for this.

Graham

LOL!< the crap is rolling out now..

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