Schematics & standards
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From: Cydrome Leader on 20 Jun 2010 13:06 "Dave Plowman (News)" <dave(a)davenoise.co.uk> wrote: > In article <hvk3bu$3ju$1(a)reader1.panix.com>, > Cydrome Leader <presence(a)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?
From: Cydrome Leader on 20 Jun 2010 13:11 Rich Webb <bbew.ar(a)mapson.nozirev.ten> wrote: > On Sat, 19 Jun 2010 15:29:45 -0700, PlainBill47(a)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.
From: David Nebenzahl on 20 Jun 2010 15:49 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)
From: PlainBill47 on 20 Jun 2010 18:25 On Sun, 20 Jun 2010 17:06:43 +0000 (UTC), Cydrome Leader <presence(a)MUNGEpanix.com> wrote: >"Dave Plowman (News)" <dave(a)davenoise.co.uk> wrote: >> In article <hvk3bu$3ju$1(a)reader1.panix.com>, >> Cydrome Leader <presence(a)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
From: Arfa Daily on 20 Jun 2010 20:33
"Cydrome Leader" <presence(a)MUNGEpanix.com> wrote in message news:hvlhh5$8rh$2(a)reader1.panix.com... > Arfa Daily <arfa.daily(a)ntlworld.com> wrote: >> >> >> "Cydrome Leader" <presence(a)MUNGEpanix.com> wrote in message >> news:hvk3bu$3ju$1(a)reader1.panix.com... >>> David Nebenzahl <nobody(a)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 |