Help vishay resistor values
Tony Ching-Kong Hwang
I'm going to order some Vishay
resistors from PArts Connection, and need a 6800 ohm resister for use as a
series resistor with
a shunt potentialmeter in a passive pre-amp, and wonder, how do you read
the values from their catalogue?
How they list some of their values is as:
100R
332R
499R
...
1K0
1K21
2K21
...
10K
15K
etc...
Thanx!
--
- Tony
/*** Tony Ching-Kong Hwang ******* (510) 549 - 2808 ************\
* T R Y S O M E O R A N G E M A R M A L A D E *
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John Klett
Tony Ching-Kong Hwang wrote:
>
> I'm going to order some Vishay
> 100R
> 332R
> 499R
> ...
> 1K0
> 1K21
> 2K21
> ...
> 10K
> 15K
> etc...
0R10 is 1/10th ohm
1R00 is 1 ohm
10R0 is 10 ohms
100R is 100 ohms
1K00 is 1,000 ohms or 1 Kilohm
10K0 is 10,000 ohms
100K is 100,000 ohms
1M00 is 1,000,000 ohms or 1 Megohm
6K80 or 6K8 WOULD BE 6,800 OHMS
This is a fairly common way of denoting values - when you copy or
reprint parts lists and schematics the little decimal point can become
lost and things can get very confusing so the letter that signifies the
multiplier becomes the decimal. R is no multiplier and O or 0 look
pretty much alike so R for resistance in Ohms. K is for Kilo or one
thousand, M is for Mega or one million (US millions or 10 raised to the
sixth). The number of digits used is indicative of tolerance.
Have fun
>>>>>>>>>>>>KLETT
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Miguelito
In article <5oiu34$m...@agate.berkeley.edu>,
>series resistor with
>a shunt potentialmeter in a passive pre-amp, and wonder, how do you read
>the values from their catalogue?
Yes, I know! I mean, the way of writing the values is totally ridiculous.
It doesn't make the least sense, not to a pro or anyone else (except to the
folks at TPC)(I presume!).
Miguel
Gregory T Freitag
Miguelito <mba...@midway.uchicago.edu> wrote in article
<EC6sM...@midway.uchicago.edu>...
> In article <5oiu34$m...@agate.berkeley.edu>,
> Tony Ching-Kong Hwang <thw...@hopi.CS.Berkeley.EDU> wrote:
> >I'm going to order some Vishay
> >resistors from PArts Connection, and need a 6800 ohm resister for use as
a
> >series resistor with
> >a shunt potentialmeter in a passive pre-amp, and wonder, how do you read
> >the values from their catalogue?
I would not stake my life on it but conventional numbering would lead me
to guess ( and I do mean guess !!! )
100R = 100 ohms
332R = 332 ohms
499R = 499 ohms
...
1K0 = 1.0 kohms
1K21 = 12 kohms
2K21 = 22 kohms
> Yes, I know! I mean, the way of writing the values is totally ridiculous.
> It doesn't make the least sense, not to a pro or anyone else (except to
the
> folks at TPC)(I presume!).
Well it does make sense, the R or K represent the decimal point/
multiplier, the last digit is the amount you move the decimal point to the
right. K multiplier = 1000 and R = 1, for 1K21 it becomes 1.2 * 1000 and
then move the decimal point and you have 12000, 10 k would be 1K01 and with
1k you drop the last zero.
These are not Vishay part #, they are considerably longer usually composed
of (model no. )(package, leaded, surface mount)(value)(tolerance)(temp
coef.)(packaging i.e.. tape and reel, bulk, ect.).
Greg
Miguelito
In article <01bc7f5d$e6e53b80$225ee8cd@gfreitag>,
Gregory T Freitag <gfre...@northnet.org> wrote:
> Well it does make sense, the R or K represent the decimal point/
> multiplier, the last digit is the amount you move the decimal point to
> the right. K multiplier = 1000 and R = 1, for 1K21 it becomes 1.2 * 1000
> and then move the decimal point and you have 12000, 10 k would be 1K01
> and with 1k you drop the last zero.
Well, I could guess what they meant (duh!) but it doesn't really make sense
*at all*. Moreover, if I would be spending money on these (and considering
their price, I don't want to order the wrong thing, frankly), I would post
just to make sure (as the original poster did). This is as stupid a scheme
as I can imagine possible. Are the guys at TPC idiots or what? I mean,
NOBODY uses this nomenclature...
> These are not Vishay part #, they are considerably longer usually
> composed
...not even them, so why be so idiotic as to use that. Besides, it makes
MUCH more sense to say something like 1,39k than 1K039R or what-the-fuck
they decide to call this.
Sorry for the tone, but I am *really* pissed of by nonsensical stupidity as
this.
Miguel
Miguelito
In article <EC8H7...@midway.uchicago.edu>,
Let me just add that the nomenclature is not even explained in the TPC
catalog.
Miguel
Andre T. Yew
mba...@midway.uchicago.edu (Miguelito) writes:
>...not even them, so why be so idiotic as to use that. Besides, it makes
>MUCH more sense to say something like 1,39k than 1K039R or what-the-fuck
>they decide to call this.
>Sorry for the tone, but I am *really* pissed of by nonsensical stupidity as
>this.
Hey Miguel, calm down! This notation is pretty much standard in the industry.
I was pretty confused the first time I saw them too (in Pete Goudreau's
posts on rahe).
--Andre
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Miguelito
In article <5omch1$e...@gap.cco.caltech.edu>,
I'm sorry, and I apologize for blowing up. It's just that I was pissed off
the first time I saw that in the TPC catalog, when I saw the original post
I thought "yeah, I wonder why they write it like this." and then this guy
explains the obvious like we are all dummies that can't figure a thing out.
As I said, if I'd spend $100 in just 10 resistors, I would have posted too,
just to make sure.
Now, wouldn't it be more reasonable to just, ya know, say 1.39K instead of
whatever they feel like inventing? Well... sure enough, this is not the
only place where nomenclature has become wacky (cap values on components
which use M and stuff is another example)(sure, there's nothing like a
Megfarad cap ;-) ).
Anyway, it must be that I'm in physics... =-)
Miguel
Craig Groeschel
In article <EC8HC...@midway.uchicago.edu>,
Miguelito <mba...@midway.uchicago.edu> wrote:
>>as I can imagine possible. Are the guys at TPC idiots or what? I mean,
>>NOBODY uses this nomenclature...
I believe the Brits can take credit for this one?
Anyway I first saw it in OCSL's _Power Amp Projects_.
>>...not even them, so why be so idiotic as to use that. Besides, it makes
>>MUCH more sense to say something like 1,39k than 1K039R or [...]
(You mean 1.39k? :-) ) 1K39.
Well if your only frame of reference is the US way of writing values, then
you might resist anything new (When I first saw ANSI C, I thought it
was pretty whacked out too.), but if you think about it, it has a couple
of very good things going for it:
* There is no tiny decimal point to get lost. Yes, in typeset publications
this is a moot point, but when you are writing on a chalkboard or in a
notebook or on a candy wrapper it can be useful.
The letter R or K or M serves as your decimal point and multiplier.
For example, 0R68 = 0.68, 1R = 1, 1K8 = 1800, 2K21 = 2210.
* It totally eliminates the i18n issue of whether to use a comma or
period for a decimal point. I would think that with this system the
entire ISO latin-1 world could understand you, if they put their brains
in gear a little bit first.
P.S. I am still getting used to seeing little rectangles for resistors.
P.P.S. You were right about the 4456 being the headphone driver,
and yes they are running it at +- 3v.
--
Craig E. Groeschel >Craig at Metro Link dot com< Not speaking for my employer.
"Do not play this piece fast. It is never right to play Ragtime fast." Joplin
Steve Jones
Miguelito wrote:
>
> Now, wouldn't it be more reasonable to just, ya know, say 1.39K instead of
> whatever they feel like inventing?
Reasons that the Standard convention is used (1K39) instead of the more
'reasonable' type (1.39K):
1) In Europe, the American location for the decimal signifies
'multiply'.
2) In alot of instances, it's easy to smudge, smear, or unitentionally
erase the small decimal obscuring the true value. Large numbers are
easier to read. Much more (real world) practical.
Just my 2 cents,
-Steve Jones
Monte P McGuire
In article <5on8la$l...@tartan.metrolink.com>,
Craig Groeschel <nos...@metrolink.com> wrote:
>* There is no tiny decimal point to get lost. Yes, in typeset publications
>this is a moot point, but when you are writing on a chalkboard or in a
>notebook or on a candy wrapper it can be useful.
Or a tiny surface mount resistor. Dust specs are larger than a
decimal point and when I see 10R1 on a tiny 0805 resistor, I know that
I have read the markings properly; the R and K are completely
unambiguous when reversed, so you never get the problem of '696' ohms
looking like '969' ohms.
A good system IMHO...
As for $10 resistors, _please_ try to find something better to spend
your money on!! There are sometimes good engineering reasons to spend
megabucks on passive components, but I think the tweakers at TPC make
it seem like you'll actually hear some sort of difference by just
throwing a lot of money at a circuit board; you have to think about
what's going on in the circuit, because expensive is not always
better!
By and large, well constructed metal film resistors are all going to
sound basically the same. Metal foil isn't going to be that much
better unless you need ultralow tempco's, and it might have greater
stray reactances because of their larger size and more complex
pattern. They all have very low voltage coefficients of resistance
and very low excess noise, so the only thing left to cause problems
are stray reactances, temperature coefficient and long term drift. If
the circuit does not require close tolerances, then long term drift
and tempco may not be all that important. Just make sure that any
self heating caused by dissipation in the resistor won't be
significant and you're OK... if in doubt, get the next larger size
resistor.
If you're super worried about temperature coefficients, don't overlook
silicon; spending lots of money and effort installing 10ppm/ degree C
resistors around a plastic case transistor is useless if the
transistor's self heating is more significant to the circuit's
behavior. How do you know? Do some modeling and analysis!! Even op
amps change behavior slightly over temperature.
A Dale RNC55H or RNC55H is about as exotic as I'll go for anything but
a matched array that has to track precisely over temperature and time.
They go for around $.50 - $1.00 each in small quantities and they're
complete overkill for most uses. Personally, a Dale RLR07 resistor
found surplus is my favorite... dirt cheap, ultra reliable, low
strays, small size and low tempco... they're cheap if you have to buy
them new too... about $.33 each.
I buy quality metal film resistors surplus at hamfests and over time,
I have found enough different values and sizes to prototype almost
anything. The going rate at hamfests these days is about $.01 per
resistor, regardless of tempco, tolerance or anything else.
Sometimes, you can get them for almost nothing. The biggest hassle is
storing them up, but it sure beats sending out large checks for small
bags of parts!!
Regards,
Monte McGuire
mcg...@world.std.com
Miguelito
>
>(You mean 1.39k? :-) ) 1K39.
=-)
>* There is no tiny decimal point to get lost.
Oh well...
>* It totally eliminates the i18n issue of whether to use a comma or
>period for a decimal point.
Now, this is really helpful...
>P.P.S. You were right about the 4456 being the headphone driver,
>and yes they are running it at +- 3v.
It's a 4556... ;-)
Miguel
Miguelito
In article <EC9F5...@world.std.com>,
Monte P McGuire <mcg...@world.std.com> wrote:
>As for $10 resistors, _please_ try to find something better to spend
>your money on!!
Agreed. I don't think I'll ever buy a Vishay.
As for the nomenclature, I must say that you have a good point there
(readability). However, I'd rather have TPC give a brief explanation of it
to people that are not accustomed to it, at the very least to justify the
price of those buggers. And you have to pay $10 to get one of their
catalogs!
Whatever...
Miguel
Arny Krüger
Steve Jones <Steve...@vcd.hp.com> wrote in article
<33AEFF...@vcd.hp.com>...
?
>
> Reasons that the Standard convention is used (1K39) instead of the more
> 'reasonable' type (1.39K):
> 1) In Europe, the American location for the decimal signifies
> 'multiply'.
> 2) In alot of instances, it's easy to smudge, smear, or unitentionally
> erase the small decimal obscuring the true value. Large numbers are
> easier to read. Much more (real world) practical.
>
I prefer the European convention, and many other folks in our club who
build, do too. I picked it up in a heartbeat when I first saw it about 33
years ago, and wondered why it was not used more broadly.
Sheldon D. Stokes
In article <01bc8089$a30dd980$9071...@crc3.concentric.net>, "Arny Krüger"
<ar...@concentric.net> wrote:
> I prefer the European convention, and many other folks in our club who
> build, do too. I picked it up in a heartbeat when I first saw it about 33
> years ago, and wondered why it was not used more broadly.
I figured the standard was as old as electronics, but I have a Quad ESL
schematic straight from Quad, and it uses the "american" decimal point
standard for values. Go figure, quad is about as british as them come.
I do like it as well. I figured they started it because of the difficulty
to silkscreen very small characters onto resistors and such.
Sheldon
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Ross Lipman
Tony Ching-Kong Hwang wrote:
>
> I'm going to order some Vishay
> resistors from PArts Connection, and need a 6800 ohm resister for use as a
> series resistor with
> a shunt potentialmeter in a passive pre-amp, and wonder, how do you read
> the values from their catalogue?
>
>
> 332R
> 499R
> ...
> 1K0
> 1K21
> 2K21
> ...
> 10K
> 15K
> etc...
>
>
> --
> - Tony
>
> /*** Tony Ching-Kong Hwang ******* (510) 549 - 2808 ************\
> * T R Y S O M E O R A N G E M A R M A L A D E *
> \**************** http://www-inst.eecs.berkeley.edu/~thwang/ ***/
6/24
Rather than use Parts Connection, try Newark Electronics or Allied.
I believe both cary Vishay at much lower prices than P/C and use more
easily understood nomenclature.
Both are on the web, so you should be able to order a catalog.
Good Luck.
Ross Lipman
rl1...@ix.netcom.com
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Stewart Pinkerton
mba...@midway.uchicago.edu (Miguelito) writes:
>Now, wouldn't it be more reasonable to just, ya know, say 1.39K instead of
>whatever they feel like inventing?
Not if you want all possible E24 values to be encompassed within a 4
character code, or E96 in 5 characters, and easily read on a small
component. That's what the code is there for. If a non-engineer picks up
an engineering catalogue, you gotta know the secret handshake........
>Well... sure enough, this is not the
>only place where nomenclature has become wacky (cap values on components
>which use M and stuff is another example)(sure, there's nothing like a
>Megfarad cap ;-) ).
Capacitors are notorious, some used to have mmF, which meant
micro-microfarad, instead of pF for picofarad. Duh! OTOH it is STILL
possible to make a big dumb mistake by ordering a neat little 10mF
electrolytic, and to have a massive 10,000 microfarad bean can arrive,
with 10mF quite correctly marked on it. You may perhaps be wondering how
I know this.................
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