Schematics & standards

[Cydrome Leader]

Arfa Daily <arfa.daily@ntlworld.com> wrote:

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:hvhv1s$88b$1@news.eternal-september.org...
David Nebenzahl <nobody@but.us.chickens> wrote in message
news:4c1bd34c$0$2542$822641b3@news.adtechcomputers.com...
Someone else made a comment in another thread here about weird
schematics (like for home appliances).

Wanted to get a small discussion going on that topic. My take: there are
good and bad standards for schematics. Personally, I can't stand the
ones that use rectangle shapes for resistors, instead of the traditional
zigzag that [insert name of deity here] intended to be used. (And even
here there are lots of variations, like old-fashioned schematics that
took this symbol rather literally and sometimes had ten or twelve zigs
and zags, as if an actual resistor was being constructed on paper).

Likewise the wire-connecting/jumping convention: here I much prefer the
modern approach, which is to use a dot for a connection and no dot for
no connection, rather than the clumsy "loop" to indicate one wire
jumping over another with no connection.

Regarding resistor values: Who the hell came up with that new way of
specifying resistance values, like "10R" "or 5K6" or whatever? And why
use this system? I've always used the plain value of the resistance: 10,
56, 5.6K, 56K, etc. Simple, obvious, requires no interpretation. Is this
some kind of Euro thing?

In general, some schematics just look and feel nicer than others. A
well-drawn schematic is a pleasure to read. A bad one--lines too thin or
too thick, misshapen symbols, idiosyncratic interpretations, etc., just
don't look right.

Feel free to add your own schematic pet peeves here.


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)



How often have you come across compressed pdf-type schema or reduced
paper-based ones where the decimal point has disappeared , and there is no
kerning for dots, so you cannot infer a position for any dot position.
Replace R/K/M for the dot makes a lot of sense.



Yes, I'd go along with that. It is a far more sensible way of showing
values, and I can't see anything counter intuitive about understanding it. I
still prefer zig-zags for resistors, and if I'm drawing a quick 'sketch' of
a diagram, I always still 'jump' the non-connected lines. However, when I'm
hand-drawing a diagram properly, with nice straight lines and 'gridded'
components, I always break one of the two crossing lines, where they break,
so sort of the 'jumping over' convention, but without the actual bridge
being drawn. I'm not sure where I first saw this, but schematics drawn like
it, look quite nice. There's no question about whether lines do connect or
not, and the brain fills in the little missing bit of the line without you
having to think about it. Where lines do connect, they get a nice dot on
them.

I always still use the original logic symbols for gates and counters and
latches and inverters and so on. I find the new style 'blocky' symbols need
too much looking at, and taking into consideration of additional writing and
symbols within the block. I always thought that the original symbols were
all sufficiently different for the most part, to allow instant understanding
of function by quick glance alone.

I would agree that appliance schematics are often unclear, and use odd
symbols. Also, with apologies to Herr Willberg, I think that German
schematics from 20 or 30 years back, are some of the worst to follow that
I've ever seen. I defy anyone who's not German, to follow a Grundig
schematic, for instance ...

Although Dutch, some of Philips' ones from a few years back were also a
nightmare to follow. They had a very frustrating convention regarding where
signals went when they (frequently) disappeared off the side of a page, and
the signal was often nigh on impossible to ever find again ...

But the prize for impossible to follow schematics, has to go to the
automotive industry. Those diagrams have a convention all of their own, and
always have done. Some of the most frustrating fault-tracing sessions of my
life, have involved cars and the electrical diagrams for them. They are a
cross between a schematic and a wiring diagram, with symbols peculiar to and
only understood by automotive manufacturing initiates. Every bullet and
connector is shown, using a variety of different conventions between
manufacturers. Schematics go across multiple pages, with wires that leave
often almost impossible to re-find on the next diagram. Colours, wire gauges
and goodness only knows what other info, are all crammed onto the diagrams.
Nightmare ...

Arfa

ha, plus every damn wire is taped together into some completely awful
harness. There has to be at least 50 pounds of PVC electrical tape in
every car out there.

 

[Cydrome Leader]

Adrian Tuddenham <adrian@poppyrecords.invalid.invalid> wrote:

David Nebenzahl <nobody@but.us.chickens> wrote:

Someone else made a comment in another thread here about weird
schematics (like for home appliances).

[...]
... wire-connecting/jumping convention: here I much prefer the
modern approach, which is to use a dot for a connection and no dot for
no connection, rather than the clumsy "loop" to indicate one wire
jumping over another with no connection.

I find the 'gap' convention is easy to draw (with a computer) and
extremely easy to read. It also looks tidy. Four-way junctions which
could be mistaken for crossings should never be used, they should be
staggered instead.

e.g.
http://www.poppyrecords.co.uk/compton/images/BassAmplifier.gif

I'd rate this schematic as weird. Some parts are identified, some aren't
and the junctions are complex for no reason.

Regarding resistor values: Who the hell came up with that new way of
specifying resistance values, like "10R" "or 5K6" or whatever? And why
use this system? I've always used the plain value of the resistance: 10,
56, 5.6K, 56K, etc. Simple, obvious, requires no interpretation. Is this
some kind of Euro thing?

I first saw it in German and Dutch publications. Once you have become
accustomed to it, it is quite easy to use and it is utterly unambiguous,
even when badly photocopied.

Who photocopies stuff anymore, and periods aren't hard to read and never
were, except in places that read right to left and switch periods to
commas.

Banks don't print money is formats like 34$00. "Oh it's hard to read" is
complete crap.

What's next- the germans and dutch replacing numbers with spelled out
words?

I'm surprised the diodes past the output stage aren't indetified as
something like:

1N4k005 or
ONE-NANO-FOUR KILO CIPHER CIPER V

or something just as goofy.

Why are the speakers just 6 ohms, while other resitors have place holders
for digits?

I just don't get it- how does using multiple systems to represent simple
data make things easier?

This is why the finest and best technology comes from the USA. Instead of
trying to rewrite a 20nm process in semiconductor manufacturing as 20nm0
like europeans might form a committee to try to do, we've come out with
15nm process while everybody else is screwing around trying to solve
problems that never existed.

Just curious, has a committee come up with some cool new way to write
voltages too?

The amp uses +/- 30. Should that be written as 30v0 and (30v0) for the
negative rail?

Afer all, a "-" sign is too confusing and might indicate and error that
was crossed out, or a period that was damaged during a recent facsimile
transmission of poorly risographed copy of schematic.

Is 5kV now 5k0?

 

[Adrian Tuddenham]

Arfa Daily <arfa.daily@ntlworld.com> wrote:

"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:4c1d00fe$0$2388$822641b3@news.adtechcomputers.com...
On 6/19/2010 8:35 AM Adrian Tuddenham spake thus:

David Nebenzahl <nobody@but.us.chickens> wrote:

Someone else made a comment in another thread here about weird
schematics (like for home appliances).

[...]
... wire-connecting/jumping convention: here I much prefer the modern
approach, which is to use a dot for a connection and no dot for
no connection, rather than the clumsy "loop" to indicate one wire
jumping over another with no connection.

I find the 'gap' convention is easy to draw (with a computer) and
extremely easy to read. It also looks tidy. Four-way junctions which
could be mistaken for crossings should never be used, they should be
staggered instead.

e.g.
http://www.poppyrecords.co.uk/compton/images/BassAmplifier.gif

BZZZZZZT! Fail.

While the gap thing looks OK for non-crossing wires, I have to ding the
drafts-person of that schematic for the following:

o Idiosyncratic symbols for electrolytic cazapitors[1]
o Idiosyncratic ground symbol (one horizontal line????)
o And no, I disagree about those offsets for connecting wires.

That's totally unnecessary here: it would be quite obvious that all those
vertical wires connect to what is obviously a bus or rail. A well-drawn
dot is all that's needed there.

(And I don't much like their transistor symbols either)


[1] With apologies to J. Liebermann.


I must say that I don't really like the staggered connections,...

They do tend to give a slightly messy appearance, but the alternatives
were worse:

1) Stagger one half of the output stage slightly to the right (takes up
more space and doesn't shout "symmetry" to the reader).

2) Use loops for crossings (even messier in appearance).

3) Dotted and un-dotted crossings (error-prone because the
straight-through line misleads the eye in spite of the dot).


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk

 

[Adrian Tuddenham]

Cydrome Leader <presence@MUNGEpanix.com> wrote:

Adrian Tuddenham <adrian@poppyrecords.invalid.invalid> wrote:
David Nebenzahl <nobody@but.us.chickens> wrote:

Someone else made a comment in another thread here about weird
schematics (like for home appliances).

[...]
... wire-connecting/jumping convention: here I much prefer the
modern approach, which is to use a dot for a connection and no dot for
no connection, rather than the clumsy "loop" to indicate one wire
jumping over another with no connection.

I find the 'gap' convention is easy to draw (with a computer) and
extremely easy to read. It also looks tidy. Four-way junctions which
could be mistaken for crossings should never be used, they should be
staggered instead.

e.g.
http://www.poppyrecords.co.uk/compton/images/BassAmplifier.gif

I'd rate this schematic as weird. Some parts are identified, some aren't
and the junctions are complex for no reason.

Regarding resistor values: Who the hell came up with that new way of
specifying resistance values, like "10R" "or 5K6" or whatever? And why
use this system? I've always used the plain value of the resistance: 10,
56, 5.6K, 56K, etc. Simple, obvious, requires no interpretation. Is this
some kind of Euro thing?

I first saw it in German and Dutch publications. Once you have become
accustomed to it, it is quite easy to use and it is utterly unambiguous,
even when badly photocopied.

Who photocopies stuff anymore, and periods aren't hard to read and never
were, except in places that read right to left and switch periods to
commas.

People often distribute low-resolution scans of printed circuit diagrams
or print them out on poor printers. Sometimes it is almost impossible
to read the figures, let alone distinguish a tiny dot.

Banks don't print money is formats like 34$00. "Oh it's hard to read" is
complete crap.

Actually the currency sign often comes first, which is a
long-established convention but very confusing the first time you meet
it.

What's next- the germans and dutch replacing numbers with spelled out
words?

I'm surprised the diodes past the output stage aren't indetified as
something like:

1N4k005 or
ONE-NANO-FOUR KILO CIPHER CIPER V

or something just as goofy.

Why are the speakers just 6 ohms, while other resitors have place holders
for digits?

The loudspeakers are nominally 6-ohms impedance (but actually much more
complex), so the markings on them aren't really component values - more
like a part description.

Which resistors only have place holders? I can quite believe that i
have made mistakes in the drawing, but I haven't spotted that one.

I just don't get it- how does using multiple systems to represent simple
data make things easier?

This is why the finest and best technology comes from the USA. Instead of
trying to rewrite a 20nm process in semiconductor manufacturing as 20nm0
like europeans might form a committee to try to do, we've come out with
15nm process while everybody else is screwing around trying to solve
problems that never existed.

I don't know if the convention was imposed on industry by a committee or
whether it was adopted by industry because it was found to have
advantages in certain circumstances. I agree that we sometimes have too
many committees, but most of Europe (except the U.K.) has acquired the
skill of appearing to comply with new regulations whilst actually
ignoring them.

Just curious, has a committee come up with some cool new way to write
voltages too?

The amp uses +/- 30. Should that be written as 30v0 and (30v0) for the
negative rail?

Afer all, a "-" sign is too confusing and might indicate and error that
was crossed out, or a period that was damaged during a recent facsimile
transmission of poorly risographed copy of schematic.

Is 5kV now 5k0?

I think you may have (deliberately ?) misunderstood the reason for that
convention. It saves space on small components and is unambiguous.
There is no need to use it for voltages (although "1v1" is easier to
write than 1.1v and less likely to be mistaken for 11v).

The convention of three numbers ("104" = 100K) is even smaller to print
but the interpretation is not as obvious until you get used to it.


--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk

 

[Arfa Daily]

"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:hvk3bu$3ju$1@reader1.panix.com...

David Nebenzahl <nobody@but.us.chickens> wrote:
Someone else made a comment in another thread here about weird
schematics (like for home appliances).

Wanted to get a small discussion going on that topic. My take: there are
good and bad standards for schematics. Personally, I can't stand the
ones that use rectangle shapes for resistors, instead of the traditional

I find rectangles obnoxious, unless somebody from europe is drawing
something in front of me.

zigzag that [insert name of deity here] intended to be used. (And even
here there are lots of variations, like old-fashioned schematics that
took this symbol rather literally and sometimes had ten or twelve zigs
and zags, as if an actual resistor was being constructed on paper).

Likewise the wire-connecting/jumping convention: here I much prefer the
modern approach, which is to use a dot for a connection and no dot for
no connection, rather than the clumsy "loop" to indicate one wire
jumping over another with no connection.

I was taught the half-loop shape first, then moved to the dots and no
dots. It seemed like how you're taught to ties shoes in a really complex
method of making two rabbit ears first, then tying them.

Regarding resistor values: Who the hell came up with that new way of
specifying resistance values, like "10R" "or 5K6" or whatever? And why
use this system? I've always used the plain value of the resistance: 10,
56, 5.6K, 56K, etc. Simple, obvious, requires no interpretation. Is this
some kind of Euro thing?

I first saw that on this newsgroup. My question is what idiots came up
with it and why?

Can you really not understand it ? Or are you being deliberately obtuse ? It
has now been explained to the point where a child could understand it. I
think it was actually me who you first saw using it here, and I'm pretty
sure that we went through it all for your benefit at the time ...

Arfa

 

[Dave Plowman (News)]

In article <hvk3bu$3ju$1@reader1.panix.com>,
Cydrome Leader <presence@MUNGEpanix.com> wrote:

Regarding resistor values: Who the hell came up with that new way of
specifying resistance values, like "10R" "or 5K6" or whatever? And why
use this system? I've always used the plain value of the resistance:
10, 56, 5.6K, 56K, etc. Simple, obvious, requires no interpretation.
Is this some kind of Euro thing?

I first saw that on this newsgroup. My question is what idiots came up
with it and why?

It's been around on this side of the pond for many a year. It uses fewer
characters and no chance of not seeing that little full stop in a poorly
copied diagram. Like everything else you need to get used to it, though.

--
*If you're not part of the solution, you're part of the precipitate *

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

 

[Adrian Tuddenham]

Bruce Esquibel <bje@ripco.com> wrote:

Adrian Tuddenham <adrian@poppyrecords.invalid.invalid> wrote:

They certainly look strange when you have been used to the
point-contact symbol, but you must admit they give a clear
representation of a junction transistor.

No they don't.

You guys talk about faded photocopies and the usage of 2.2K vs. 2K2, it ever
occur to you a faded photocopy of the BassAmplifier2.gif, those transistors
come out looking like diodes?

Perhaps, but there aren't many diodes with three wire connections that
they could be mistaken for. The direction of the arrows might be lost
if they became blobby, but so would the arrows on the point-contact
symbol.

I'm with Dave, I never seen that either.

It is unusual nowadays, but if you had been designing in the 1960s you
would have come across it from time to time.

Plus, what the hell is the S-N-U on the tip35c's and R-G-O on the tip36'c?

Slate-Brown-Blue. Red-Green-Orange. It is the colour code of the
wires. The output transistors are mounted on individual heat sinks and
connected to the rest of the amplifier by a wiring loom, so the colour
code is helpful for fault-finding.

I can't find a single datasheet for them that uses anything else besides
E-B-C.

I didn't think there was any need for E-B-C as that should be obvious
from the symbols.

That diagram is terrible.

We were discussing our preferred symbols and that diagram illustrates my
preferences. My personal dislikes are:

1) The crossing & dot convention.

2) Transistors and valves shown as a collection of electrodes floating
in space without envelopes.

3) Power supply rails all mixed up with the earth rail at the bottom of
the drawing.

For an example of a truly horrible circuit diagram see:
<http://www.audiosharing.com/archive/western/we_amp/pdf/No.8.pdf>


When re-drawn it makes a lot more sense:
< http://www.poppyrecords.co.uk/other/images/WE8a.gif>




--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk

 

[Bruce Esquibel]

Adrian Tuddenham <adrian@poppyrecords.invalid.invalid> wrote:

They certainly look strange when you have been used to the
point-contact symbol, but you must admit they give a clear
representation of a junction transistor.

No they don't.

You guys talk about faded photocopies and the usage of 2.2K vs. 2K2, it ever
occur to you a faded photocopy of the BassAmplifier2.gif, those transistors
come out looking like diodes?

I'm with Dave, I never seen that either.

Plus, what the hell is the S-N-U on the tip35c's and R-G-O on the tip36'c?

I can't find a single datasheet for them that uses anything else besides
E-B-C.

That diagram is terrible.

-bruce
bje@ripco.com

 

[Arfa Daily]

"Adrian Tuddenham" <adrian@poppyrecords.invalid.invalid> wrote in message
news:1jke3p0.aabxi6jodbawN%adrian@poppyrecords.invalid.invalid...

Bruce Esquibel <bje@ripco.com> wrote:

Adrian Tuddenham <adrian@poppyrecords.invalid.invalid> wrote:

They certainly look strange when you have been used to the
point-contact symbol, but you must admit they give a clear
representation of a junction transistor.

No they don't.

You guys talk about faded photocopies and the usage of 2.2K vs. 2K2, it
ever
occur to you a faded photocopy of the BassAmplifier2.gif, those
transistors
come out looking like diodes?

Perhaps, but there aren't many diodes with three wire connections that
they could be mistaken for. The direction of the arrows might be lost
if they became blobby, but so would the arrows on the point-contact
symbol.

The symbol for an adjustable zener, used typically in switch mode power
supplies, looks pretty similar

Arfa

 

[whit3rd]

On Jun 19, 3:29 pm, PlainBil...@yahoo.com wrote:

I prefer the 'old' style - zig-zag lines for resistors, parallel lines
for non-polar capacitors, etc.

That's OK for digital work, but for RF or high Z, your capacitor
symbol needs to have one line, one curve, as appropriate.

Another subtlety: if the tube symbol has a dot, it's OK to see
a plate glow. No dot, that glow means ... too much current.

 

[Cydrome Leader]

Arfa Daily <arfa.daily@ntlworld.com> wrote:

"David Nebenzahl" <nobody@but.us.chickens> wrote in message
news:4c1d00fe$0$2388$822641b3@news.adtechcomputers.com...
On 6/19/2010 8:35 AM Adrian Tuddenham spake thus:

David Nebenzahl <nobody@but.us.chickens> wrote:

Someone else made a comment in another thread here about weird
schematics (like for home appliances).

[...]
... wire-connecting/jumping convention: here I much prefer the modern
approach, which is to use a dot for a connection and no dot for
no connection, rather than the clumsy "loop" to indicate one wire
jumping over another with no connection.

I find the 'gap' convention is easy to draw (with a computer) and
extremely easy to read. It also looks tidy. Four-way junctions which
could be mistaken for crossings should never be used, they should be
staggered instead.

e.g.
http://www.poppyrecords.co.uk/compton/images/BassAmplifier.gif

BZZZZZZT! Fail.

While the gap thing looks OK for non-crossing wires, I have to ding the
drafts-person of that schematic for the following:

o Idiosyncratic symbols for electrolytic cazapitors[1]
o Idiosyncratic ground symbol (one horizontal line????)
o And no, I disagree about those offsets for connecting wires.

That's totally unnecessary here: it would be quite obvious that all those
vertical wires connect to what is obviously a bus or rail. A well-drawn
dot is all that's needed there.

(And I don't much like their transistor symbols either)


[1] With apologies to J. Liebermann.


I must say that I don't really like the staggered connections, but what's
wrong with the transistor symbols ? And the single heavy horizontal line for
the 0v rail, is very common this side of the pond. 0v rails always used to
be shown as a heavy horizontal line right across the schematic, sometimes
with a chassis symbol attached as well. These days, most schematics are so
complex, that the 0v line is now left out, and 'abbreviated' to individual
short heavy lines at each connection point on the schematic. The
electrolytic symbol is not, however, the one commonly used here, which is a
pair of rectangles, one filled in for the -ve side, and the other open for
the +ve side. Sometimes, the American convention of one straight and one
curved plate, is used.

Arfa

Americans also do crazy things like just write a + sign next to the anode
if two parallel lines of equal size are used to represent a capacitor.

On the other hand, only the cathode is marked on electrolytics for some
reason. Is there a great story behind this?

 

[Cydrome Leader]

Arfa Daily <arfa.daily@ntlworld.com> wrote:

"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:hvk3bu$3ju$1@reader1.panix.com...
David Nebenzahl <nobody@but.us.chickens> wrote:
Someone else made a comment in another thread here about weird
schematics (like for home appliances).

Wanted to get a small discussion going on that topic. My take: there are
good and bad standards for schematics. Personally, I can't stand the
ones that use rectangle shapes for resistors, instead of the traditional

I find rectangles obnoxious, unless somebody from europe is drawing
something in front of me.

zigzag that [insert name of deity here] intended to be used. (And even
here there are lots of variations, like old-fashioned schematics that
took this symbol rather literally and sometimes had ten or twelve zigs
and zags, as if an actual resistor was being constructed on paper).

Likewise the wire-connecting/jumping convention: here I much prefer the
modern approach, which is to use a dot for a connection and no dot for
no connection, rather than the clumsy "loop" to indicate one wire
jumping over another with no connection.

I was taught the half-loop shape first, then moved to the dots and no
dots. It seemed like how you're taught to ties shoes in a really complex
method of making two rabbit ears first, then tying them.

Regarding resistor values: Who the hell came up with that new way of
specifying resistance values, like "10R" "or 5K6" or whatever? And why
use this system? I've always used the plain value of the resistance: 10,
56, 5.6K, 56K, etc. Simple, obvious, requires no interpretation. Is this
some kind of Euro thing?

I first saw that on this newsgroup. My question is what idiots came up
with it and why?

Can you really not understand it ? Or are you being deliberately obtuse ? It
has now been explained to the point where a child could understand it. I
think it was actually me who you first saw using it here, and I'm pretty
sure that we went through it all for your benefit at the time ...

Arfa

That's funny as writing out values the correct and conventional way
doesn't need explanation and a child can follow it, and it's been that way
for decades.

I'm still waiting to see values for money being written out as 44"euro
symbol"66 with cents after the end instead of 44.66.

periods are too confusing, commas are too confusing! help, we're all
stupid these days!

 

[Cydrome Leader]

"Dave Plowman (News)" <dave@davenoise.co.uk> wrote:

In article <hvk3bu$3ju$1@reader1.panix.com>,
Cydrome Leader <presence@MUNGEpanix.com> wrote:
Regarding resistor values: Who the hell came up with that new way of
specifying resistance values, like "10R" "or 5K6" or whatever? And why
use this system? I've always used the plain value of the resistance:
10, 56, 5.6K, 56K, etc. Simple, obvious, requires no interpretation.
Is this some kind of Euro thing?

I first saw that on this newsgroup. My question is what idiots came up
with it and why?

It's been around on this side of the pond for many a year. It uses fewer
characters and no chance of not seeing that little full stop in a poorly
copied diagram. Like everything else you need to get used to it, though.

I saw an original diagram for a bass amplifier earlier in this post.

it looked awful and it wasn't a copy. The text annotations looked like
they came from a 9 dot matrix printer and were small and hard to read. The
transistors looked lopsided and weird too. That's how it was from the
start.

I've seriously seen wet-type microfiche printer printouts that look better
and are easier to follow.

Getting bored and changing how you do stuff every few years doesn't make
schematics better looking, eaaier to follow or less ambigious by itself.

So, when do you start to write 1.5km as 1km5?

 

[Cydrome Leader]

Rich Webb <bbew.ar@mapson.nozirev.ten> wrote:

On Sat, 19 Jun 2010 15:29:45 -0700, PlainBill47@yahoo.com wrote:

Lines should be drawn with the little loop when crossing lines do not
connect, a dot when they do. Again, redundancy.

Crossings (four-way intersections) never connect. Three-way
intersections always connect. Stick with that convention and neither the
humpie or a dot are needed, although dots do "look right."

There is an authorized reprint of H&H's "How to Draw Schematic Diagrams"
from AoE Appx E over at
http://opencircuitdesign.com/xcircuit/goodschem/goodschem.html

hahaha.

the "awful" schematic is great. All it needs are euro-notations, then to
be rendered in a small terrible font then saved as a gif.

 

[David Nebenzahl]

On 6/20/2010 7:06 AM Adrian Tuddenham spake thus:

My personal dislikes are:

2) Transistors and valves shown as a collection of electrodes floating
in space without envelopes.

Agree with this 100%. No need to be so chintzy!


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

 

On Sun, 20 Jun 2010 17:06:43 +0000 (UTC), Cydrome Leader
<presence@MUNGEpanix.com> wrote:

"Dave Plowman (News)" <dave@davenoise.co.uk> wrote:
In article <hvk3bu$3ju$1@reader1.panix.com>,
Cydrome Leader <presence@MUNGEpanix.com> wrote:
Regarding resistor values: Who the hell came up with that new way of
specifying resistance values, like "10R" "or 5K6" or whatever? And why
use this system? I've always used the plain value of the resistance:
10, 56, 5.6K, 56K, etc. Simple, obvious, requires no interpretation.
Is this some kind of Euro thing?

I first saw that on this newsgroup. My question is what idiots came up
with it and why?

It's been around on this side of the pond for many a year. It uses fewer
characters and no chance of not seeing that little full stop in a poorly
copied diagram. Like everything else you need to get used to it, though.

I saw an original diagram for a bass amplifier earlier in this post.

it looked awful and it wasn't a copy. The text annotations looked like
they came from a 9 dot matrix printer and were small and hard to read. The
transistors looked lopsided and weird too. That's how it was from the
start.

I've seriously seen wet-type microfiche printer printouts that look better
and are easier to follow.

Getting bored and changing how you do stuff every few years doesn't make
schematics better looking, eaaier to follow or less ambigious by itself.

So, when do you start to write 1.5km as 1km5?

That's an excellent suggestion. Your first?

As an aside, what is it with people who seem to feel they have a
god-given right to dictate the 'right' way to do things? If they had
their way, we'd still be walking everywhere, and seeking shelter in
trees at night. Things change; usually for the better, sometimes not.
Deal with it.

PlainBill

 

[Arfa Daily]

"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:hvlhh5$8rh$2@reader1.panix.com...

Arfa Daily <arfa.daily@ntlworld.com> wrote:


"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:hvk3bu$3ju$1@reader1.panix.com...
David Nebenzahl <nobody@but.us.chickens> wrote:
Someone else made a comment in another thread here about weird
schematics (like for home appliances).

Wanted to get a small discussion going on that topic. My take: there
are
good and bad standards for schematics. Personally, I can't stand the
ones that use rectangle shapes for resistors, instead of the
traditional

I find rectangles obnoxious, unless somebody from europe is drawing
something in front of me.

zigzag that [insert name of deity here] intended to be used. (And even
here there are lots of variations, like old-fashioned schematics that
took this symbol rather literally and sometimes had ten or twelve zigs
and zags, as if an actual resistor was being constructed on paper).

Likewise the wire-connecting/jumping convention: here I much prefer the
modern approach, which is to use a dot for a connection and no dot for
no connection, rather than the clumsy "loop" to indicate one wire
jumping over another with no connection.

I was taught the half-loop shape first, then moved to the dots and no
dots. It seemed like how you're taught to ties shoes in a really complex
method of making two rabbit ears first, then tying them.

Regarding resistor values: Who the hell came up with that new way of
specifying resistance values, like "10R" "or 5K6" or whatever? And why
use this system? I've always used the plain value of the resistance:
10,
56, 5.6K, 56K, etc. Simple, obvious, requires no interpretation. Is
this
some kind of Euro thing?

I first saw that on this newsgroup. My question is what idiots came up
with it and why?

Can you really not understand it ? Or are you being deliberately obtuse ?
It
has now been explained to the point where a child could understand it. I
think it was actually me who you first saw using it here, and I'm pretty
sure that we went through it all for your benefit at the time ...

Arfa


That's funny as writing out values the correct and conventional way
doesn't need explanation and a child can follow it, and it's been that way
for decades.

I'm still waiting to see values for money being written out as 44"euro
symbol"66 with cents after the end instead of 44.66.

periods are too confusing, commas are too confusing! help, we're all
stupid these days!

OK then. You started going on about writing voltages in that notation, as
though you couldn't understand that either. Do they not sell zener diodes in
America ? That notation has been used for as long as they've been around.
Like BZY88 C6V8. Have you never seen that, or perhaps you've never
understood what it meant ?

Arfa

 

[Arfa Daily]

<PlainBill47@yahoo.com> wrote in message
news:525t16dtkek7laq8jlvt7s8o7hqo64g3rm@4ax.com...

On Sun, 20 Jun 2010 17:06:43 +0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:

"Dave Plowman (News)" <dave@davenoise.co.uk> wrote:
In article <hvk3bu$3ju$1@reader1.panix.com>,
Cydrome Leader <presence@MUNGEpanix.com> wrote:
Regarding resistor values: Who the hell came up with that new way of
specifying resistance values, like "10R" "or 5K6" or whatever? And
why
use this system? I've always used the plain value of the resistance:
10, 56, 5.6K, 56K, etc. Simple, obvious, requires no interpretation.
Is this some kind of Euro thing?

I first saw that on this newsgroup. My question is what idiots came up
with it and why?

It's been around on this side of the pond for many a year. It uses fewer
characters and no chance of not seeing that little full stop in a poorly
copied diagram. Like everything else you need to get used to it, though.

I saw an original diagram for a bass amplifier earlier in this post.

it looked awful and it wasn't a copy. The text annotations looked like
they came from a 9 dot matrix printer and were small and hard to read. The
transistors looked lopsided and weird too. That's how it was from the
start.

I've seriously seen wet-type microfiche printer printouts that look better
and are easier to follow.

Getting bored and changing how you do stuff every few years doesn't make
schematics better looking, eaaier to follow or less ambigious by itself.

So, when do you start to write 1.5km as 1km5?

That's an excellent suggestion. Your first?

As an aside, what is it with people who seem to feel they have a
god-given right to dictate the 'right' way to do things? If they had
their way, we'd still be walking everywhere, and seeking shelter in
trees at night. Things change; usually for the better, sometimes not.
Deal with it.

PlainBill

Seconded

Arfa

 

[David Nebenzahl]

On 6/20/2010 5:33 PM Arfa Daily spake thus:

"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:hvlhh5$8rh$2@reader1.panix.com...

Arfa Daily <arfa.daily@ntlworld.com> wrote:

"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:hvk3bu$3ju$1@reader1.panix.com...

David Nebenzahl <nobody@but.us.chickens> wrote:

Regarding resistor values: Who the hell came up with that new
way of specifying resistance values, like "10R" "or 5K6" or
whatever? And why use this system? I've always used the plain
value of the resistance: 10, 56, 5.6K, 56K, etc. Simple,
obvious, requires no interpretation. Is this some kind of
Euro thing?

I first saw that on this newsgroup. My question is what idiots came up
with it and why?

Can you really not understand it ? Or are you being deliberately
obtuse ? It has now been explained to the point where a child
could understand it. I think it was actually me who you first saw
using it here, and I'm pretty sure that we went through it all
for your benefit at the time ...

That's funny as writing out values the correct and conventional way
doesn't need explanation and a child can follow it, and it's been that way
for decades.

I'm still waiting to see values for money being written out as 44"euro
symbol"66 with cents after the end instead of 44.66.

periods are too confusing, commas are too confusing! help, we're all
stupid these days!

OK then. You started going on about writing voltages in that notation, as
though you couldn't understand that either. Do they not sell zener diodes in
America ? That notation has been used for as long as they've been around.
Like BZY88 C6V8. Have you never seen that, or perhaps you've never
understood what it meant ?

Actually, I think you misunderstood *him*. He was saying that if you're
going to use that strange system for resistances, why not also use it
for voltages (or perhaps any quantity) as well? Instead of 5.6 volts,
since you're so all-fired worried about the potential loss of a period
(sorry, full stop), then you should write it as 5V6, no? Or something
like that.

I agree with him. Why the concern about potential loss of decimal-place
information regarding resistances, but not for other parameters like
voltage?

I think this whole system is needless, and therefore needlessly obtuse,
no matter that people like you may become accustomed to it. How often
does a decimal point actually disappear? Seems as if schematics were
drawn the old "bad" way for decades, and I don't remember any big
hullabaloo about mistaken resistance values.


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)

 

[David Nebenzahl]

On 6/20/2010 3:25 PM PlainBill47@yahoo.com spake thus:

As an aside, what is it with people who seem to feel they have a
god-given right to dictate the 'right' way to do things? If they had
their way, we'd still be walking everywhere, and seeking shelter in
trees at night. Things change; usually for the better, sometimes not.
Deal with it.

I'll say "point taken", even though you are obviously disagreeing with
my (and others') objection to the 8K2 system of ohmic representations.

One could just as easily turn that statement of yours around to wonder
how the committee that mandated this new system of nomenclature has a
right to impose their will on us, as the "god-given right to dictate the
'right' way to do things".

I just think it's needless, therefore not an improvement, as opposed to
how living in houses is obviously an improvement over seeking shelter in
trees at night.

(or is it? ... )


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)