Why Is 47 So Popular In Electronics?

B

Bret Cahill

Guest
Or 0.00047?

A good selection of caps, resistors, etc all seem to include the size
47.


Bret Cahill
 
On Sat, 7 Apr 2012 10:02:05 -0700 (PDT), Bret Cahill
<BretCahill@peoplepc.com> wrote:

Or 0.00047?

A good selection of caps, resistors, etc all seem to include the size
47.


Bret Cahill
http://www.logwell.com/tech/components/resistor_values.html


Some people, especially the folks who make power resistors, tend to
ignore the "E" series, and make things like 50 ohm 10% resistors.

We, like a lot of people lately, prefer to use only 1% resistors, the
E96 series.

We avoid leading zeroes and small integer values, too. Like your
0.00047. 0.33 uF is 330 nF to us.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
 
On Sat, 7 Apr 2012 10:02:05 -0700 (PDT), Bret Cahill
<BretCahill@peoplepc.com> wrote:

Or 0.00047?

A good selection of caps, resistors, etc all seem to include the size
47.


Bret Cahill
You're not really serious are you Brett?
 
On Sat, 07 Apr 2012 15:31:03 -0400, Tom Biasi <tombiasi@optonline.net>
wrote:

On Sat, 7 Apr 2012 10:02:05 -0700 (PDT), Bret Cahill
BretCahill@peoplepc.com> wrote:

Or 0.00047?

A good selection of caps, resistors, etc all seem to include the size
47.


Bret Cahill


You're not really serious are you Brett?
Oh, he is.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
 
On 2012-04-07, Bret Cahill <BretCahill@peoplepc.com> wrote:
Or 0.00047?

A good selection of caps, resistors, etc all seem to include the size
47.

as others have said E6

http://en.wikipedia.org/wiki/E6_series_of_preferred_numbers#E_series

10^(4/6)

--
⚂⚃ 100% natural

--- Posted via news://freenews.netfront.net/ - Complaints to news@netfront.net ---
 
On Sat, 07 Apr 2012 12:36:36 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

On Sat, 07 Apr 2012 15:31:03 -0400, Tom Biasi <tombiasi@optonline.net
wrote:

On Sat, 7 Apr 2012 10:02:05 -0700 (PDT), Bret Cahill
BretCahill@peoplepc.com> wrote:

Or 0.00047?

A good selection of caps, resistors, etc all seem to include the size
47.


Bret Cahill


You're not really serious are you Brett?

Oh, he is.
I know Bret from other groups.
You are probably correct.
 
On Sun, 8 Apr 2012 11:24:57 -0700 (PDT), Bret Cahill
<BretCahill@peoplepc.com> wrote:

Or 0.00047?

A good selection of caps, resistors, etc all seem to include the size
47.

Bret Cahill

You're not really serious are you Brett?

OK, here's a more difficult question:

Why do 16" diameter flour tortillas come in packages of 10 that weigh
3.20 lbs?

Why is it so important for a flour tortilla to weigh 0.32 lbs +/- 0.05
lbs?

That comes out to be 5.12 oz or 145.3 gms.





The weight is not important, the ability to see the loss in weight is.
Less weight = more dry.
 
Or 0.00047?

A good selection of caps, resistors, etc all seem to include the size
47.

Bret Cahill

You're not really serious are you Brett?
OK, here's a more difficult question:

Why do 16" diameter flour tortillas come in packages of 10 that weigh
3.20 lbs?

Why is it so important for a flour tortilla to weigh 0.32 lbs +/- 0.05
lbs?

That comes out to be 5.12 oz or 145.3 gms.
 
On Sunday, April 8, 2012 12:24:57 PM UTC-6, Bret Cahill wrote:
Or 0.00047?

A good selection of caps, resistors, etc all seem to include the size
47.

Bret Cahill

You're not really serious are you Brett?

OK, here's a more difficult question:

Why do 16" diameter flour tortillas come in packages of 10 that weigh
3.20 lbs?

Why is it so important for a flour tortilla to weigh 0.32 lbs +/- 0.05
lbs?
A much more serious question is why hand tools come in
packaging that requires a cutting torch to open, while
light bulbs are sold in the flimsiest cardboard known to
man.

Bob M.
 
On Sun, 8 Apr 2012 21:30:30 -0700 (PDT), Bob Myers
<bobmyersco@gmail.com> wrote:

On Sunday, April 8, 2012 12:24:57 PM UTC-6, Bret Cahill wrote:
Or 0.00047?

A good selection of caps, resistors, etc all seem to include the size
47.

Bret Cahill

You're not really serious are you Brett?

OK, here's a more difficult question:

Why do 16" diameter flour tortillas come in packages of 10 that weigh
3.20 lbs?

Why is it so important for a flour tortilla to weigh 0.32 lbs +/- 0.05
lbs?

A much more serious question is why hand tools come in
packaging that requires a cutting torch to open, while
light bulbs are sold in the flimsiest cardboard known to
man.
Except for CFLs. A while back (when they were still $10
each) I had one whose plastic packaging seemed to be
bomb-proof. I slit along one edge, and as I struggled to
free the little beastie, it launched itself skyward and
self-destructed when it hit the dining room table. This was
definitely a case of "ten dollars a pop"... with a real
"pop" ! <g>

Best regards,


Bob Masta

DAQARTA v6.02
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
Frequency Counter, FREE Signal Generator
Pitch Track, Pitch-to-MIDI
Science with your sound card!
 
Bob Masta wrote:
On Sun, 8 Apr 2012 21:30:30 -0700 (PDT), Bob Myers
bobmyersco@gmail.com> wrote:
(...)

A much more serious question is why hand tools come in
packaging that requires a cutting torch to open, while
light bulbs are sold in the flimsiest cardboard known to
man.

Except for CFLs. A while back (when they were still $10
each) I had one whose plastic packaging seemed to be
bomb-proof. I slit along one edge, and as I struggled to
free the little beastie, it launched itself skyward and
self-destructed when it hit the dining room table. This was
definitely a case of "ten dollars a pop"... with a real
"pop" !<g
I use my *band saw* to get into modern blister packs.
I slice open three sides. It's fast, easy and noisy.
What's not to like?

--Winston
 

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