Just wait until some yo-yo offers up a 1st gen IPhone in original packaging. $20K USD won't even register in the bidding war.
Yeah!
It seems strange that we can all happily use decimal points with money, but are too stupid to realise when some circuit designations don't make sense!
It's the same mentality which has ginormous lengths of timber sold in mm instead of metres.
As someone else already pointed out, it's not uncommon for component values, or current measurements, in a circuit to cover a huge range of values. A capacitor microphone preamp might easily include 10G ohm resistors and 100 ohm resistors. We use money for things that we've got, at first sight, a good grasp on the general price that they ought to have (a car, a loaf of bread, and so on), we'd spot a crazy value much faster than we might in an unfamiliar circuit.
Here's an example of a schematic I drew up for my own use. The notes specify for example resistor parameters and specifically that "K" means 1000.
My comment was really pretty much "tongue in cheek"!
In my experience, the schematics which had been (horribly) photocopied were usually the ones that needed (& mostly used) the now preferred method, although with European stuff, it was often a "lucky dip" as to which system the original draughtsman used.
I used to love it, back in the day, when an EE would tack together a self supporting "spiderweb" of components, which would "work a treat".
The poor old Tech then had to make a permanent version on a PCB, which often had major problems with stray capacitance which were absent from the "spiderweb"!
Here's an example of a schematic I drew up for my own use. The notes specify for example resistor parameters and specifically that "K" means 1000.
Why not "k=1000"? I can think of places in a PSU where you might have both "M" and "m". (Bleed resistors or startup circuits, current sensing)
If you are going to use non-standard units, why not go the whole hog? For resistance you could use a "Siemens mercury unit", "Ohmad" , "Digney", "Breguet", "Swiss", "Matthiessen", "Varley", "German mile", "Abohm", "Statohm". For capacitance, Jars is an obvious alternative. Etc.
Just wait until some yo-yo offers up a 1st gen IPhone in original packaging. $20K USD won't even register in the bidding war.
Oh, it is for sure a silver-based deposit; one of the first reliable methods developed for electroplating plastics and ceramic. I've run into this construction method many times; very popular in remote controls from the 80s, along with printed resistors. I was thinking maybe mask off with Kapton tape to make the traces...?
mnem
Time for a "Hail Mary"...!
I've had a couple fine reworks to do and seem to remember masking adjacent tracks wasn't the best solution removing mask didn't leave a clean cut and disrupted the added layer.
What worked best for me was removing the tip from the pen (clockwise unscrew for the CircuitWorks pens) and dipping in a sewing needle tip, move fast and repeat regularly.
Yeah, I've done similar with resist pens back in the day. Maybe something like these: https://www.amazon.com/AIEX-Miniature-Painting-Brushes-Watercolor/dp/B07PJ5GMX7/
with 000 size, or even a better set with 00000 brushes in it.
mnem
This is how bad it was after cleaning, I think if I had a go at trying to paint that it would end up an absolute dog's dinner. It would also be very difficult trying to find out where they need to connect under the photo-resistive material.
I think the seal has helped trap if any moisture that got underneath, picture below is of one the 5245L boards.
I opened up one of the six identical boards from the 5248M, which seems to have no corrosion.
The decoder plate is the same as used in the faulty board, I've moved it to the high speed board. Sphere have some of the lower speed boards of this type and I've ordered some.
For completeness here is one of the display decoder plates from the standard 5243L, note the difference in layout of the traces & photo-resistor material.
David
Here's an example of a schematic I drew up for my own use. The notes specify for example resistor parameters and specifically that "K" means 1000.
Why not "k=1000"? I can think of places in a PSU where you might have both "M" and "m". (Bleed resistors or startup circuits, current sensing)
If you are going to use non-standard units, why not go the whole hog? For resistance you could use a "Siemens mercury unit", "Ohmad" , "Digney", "Breguet", "Swiss", "Matthiessen", "Varley", "German mile", "Abohm", "Statohm". For capacitance, Jars is an obvious alternative. Etc.
I am simply copying what apparently has been a standard here in the U.S. which for some reason you guys in Europe get all pissy and whiny whenever I mention it. I looked at schematics from Tek, HP, Fluke, Heath, etc and EVERYONE expresses UC K as 1000. The latest schematics I have dated in 1990's for the Fluke 87 have resistors expressed as, for example, 2.2K. Now I understand and accept that UC K also is for Kelvin. But over here it also stood for multiplier 1000. Right, wrong, or indifferent that's the way it was. I can't tell you if it's still used that way or not because we can't get schematics anymore. And as I keep mentioning...any draftsman worth his salt will have notes indicating what the specific symbology means. So I ask you...if that's done and it's understood what's the big fucking deal?
I just tripped over this while looking for inserts for my iPod dock... eBay auction: #182909336044
mnem
Electrocuted means killed by means of electric shock. You're wearing this in the coffin?
Here's an example of a schematic I drew up for my own use. The notes specify for example resistor parameters and specifically that "K" means 1000.
Why not "k=1000"? I can think of places in a PSU where you might have both "M" and "m". (Bleed resistors or startup circuits, current sensing)
If you are going to use non-standard units, why not go the whole hog? For resistance you could use a "Siemens mercury unit", "Ohmad" , "Digney", "Breguet", "Swiss", "Matthiessen", "Varley", "German mile", "Abohm", "Statohm". For capacitance, Jars is an obvious alternative. Etc.
I am simply copying what apparently has been a standard here in the U.S. which for some reason you guys in Europe get all pissy and whiny whenever I mention it. I looked at schematics from Tek, HP, Fluke, Heath, etc and EVERYONE expresses UC K as 1000. The latest schematics I have dated in 1990's for the Fluke 87 have resistors expressed as, for example, 2.2K. Now I understand and accept that UC K also is for Kelvin. But over here it also stood for multiplier 1000. Right, wrong, or indifferent that's the way it was. I can't tell you if it's still used that way or not because we can't get schematics anymore. And as I keep mentioning...any draftsman worth his salt will have notes indicating what the specific symbology means. So I ask you...if that's done and it's understood what's the big fucking deal?
So, you also measure time in units of conductance (S)?
K isn't a UK measure of temperature, it is international, and the only way of referring to temperature above absolute zero.
Frequently "K" is used to mean 1024.
And two wrongs don't make a right!
Would you think it acceptable for a draughtsman to indicate that "m" means 1000000 on his drawing? Or to use multipliers of lakh (100000) and crore (10000000)?
Fundamentally the purpose of a document is to record information so that it can be used by other people. Anything getting in the way of that is to be deprecated.
Electrocuted means killed by means of electric shock. You're wearing this in the coffin?
That's a pet peeve of mine. Unfortunatly misuse particuarly on-line has normallised electrocution to mean electric shock, not death by electricity. Seems to have started in the USA. Then again I'm a pedntic sod.
And since we're tossing arrows back and forth across the pond riddle me this. How come a vacuum tube, 12AX7 for example, developed by RCA in 1947 is suddenly an ECC83 in Europe? It's the same tube. Why different naming convention for a tube that wasn't developed in Europe? Should it not carry the same designation to avoid confusion? In reality do I really care? Nope. Does it bother me? Nope. Is it WRONG? Absolutely.
Here's an example of a schematic I drew up for my own use. The notes specify for example resistor parameters and specifically that "K" means 1000.
Why not "k=1000"? I can think of places in a PSU where you might have both "M" and "m". (Bleed resistors or startup circuits, current sensing)
If you are going to use non-standard units, why not go the whole hog? For resistance you could use a "Siemens mercury unit", "Ohmad" , "Digney", "Breguet", "Swiss", "Matthiessen", "Varley", "German mile", "Abohm", "Statohm". For capacitance, Jars is an obvious alternative. Etc.
I am simply copying what apparently has been a standard here in the U.S. which for some reason you guys in Europe get all pissy and whiny whenever I mention it. I looked at schematics from Tek, HP, Fluke, Heath, etc and EVERYONE expresses UC K as 1000. The latest schematics I have dated in 1990's for the Fluke 87 have resistors expressed as, for example, 2.2K. Now I understand and accept that UC K also is for Kelvin. But over here it also stood for multiplier 1000. Right, wrong, or indifferent that's the way it was. I can't tell you if it's still used that way or not because we can't get schematics anymore. And as I keep mentioning...any draftsman worth his salt will have notes indicating what the specific symbology means. So I ask you...if that's done and it's understood what's the big fucking deal?
Here's an example of a schematic I drew up for my own use. The notes specify for example resistor parameters and specifically that "K" means 1000.
Why not "k=1000"? I can think of places in a PSU where you might have both "M" and "m". (Bleed resistors or startup circuits, current sensing)
If you are going to use non-standard units, why not go the whole hog? For resistance you could use a "Siemens mercury unit", "Ohmad" , "Digney", "Breguet", "Swiss", "Matthiessen", "Varley", "German mile", "Abohm", "Statohm". For capacitance, Jars is an obvious alternative. Etc.
I am simply copying what apparently has been a standard here in the U.S. which for some reason you guys in Europe get all pissy and whiny whenever I mention it. I looked at schematics from Tek, HP, Fluke, Heath, etc and EVERYONE expresses UC K as 1000. The latest schematics I have dated in 1990's for the Fluke 87 have resistors expressed as, for example, 2.2K. Now I understand and accept that UC K also is for Kelvin. But over here it also stood for multiplier 1000. Right, wrong, or indifferent that's the way it was. I can't tell you if it's still used that way or not because we can't get schematics anymore. And as I keep mentioning...any draftsman worth his salt will have notes indicating what the specific symbology means. So I ask you...if that's done and it's understood what's the big fucking deal?
So, you also measure time in units of conductance (S)?
K isn't a UK measure of temperature, it is international, and the only way of referring to temperature above absolute zero.
Frequently "K" is used to mean 1024.
And two wrongs don't make a right!
Would you think it acceptable for a draughtsman to indicate that "m" means 1000000 on his drawing? Or to use multipliers of lakh (100000) and crore (10000000)?
Fundamentally the purpose of a document is to record information so that it can be used by other people. Anything getting in the way of that is to be deprecated.
This is getting ridiculous. Your arguments and examples are irrelevant. The fact remains it was done on just about every American schematic you care to pull up. Whether it's still done that way I can't say. Perhaps we now "tow the line" and adhere to some accepted international standard. And basically you've indicted every American draftsman as incompetent. And as far as I'm concerned for my own use I will continue to use it.
And since we're tossing arrows back and forth across the pond riddle me this. How come a vacuum tube, 12AX7 for example, developed by RCA in 1947 is suddenly an ECC83 in Europe? It's the same tube. Why different naming convention for a tube that wasn't developed in Europe? Should it not carry the same designation to avoid confusion? In reality do I really care? Nope. Does it bother me? Nope. Is it WRONG? Absolutely.
Here's an example of a schematic I drew up for my own use. The notes specify for example resistor parameters and specifically that "K" means 1000.
Why not "k=1000"? I can think of places in a PSU where you might have both "M" and "m". (Bleed resistors or startup circuits, current sensing)
If you are going to use non-standard units, why not go the whole hog? For resistance you could use a "Siemens mercury unit", "Ohmad" , "Digney", "Breguet", "Swiss", "Matthiessen", "Varley", "German mile", "Abohm", "Statohm". For capacitance, Jars is an obvious alternative. Etc.
I am simply copying what apparently has been a standard here in the U.S. which for some reason you guys in Europe get all pissy and whiny whenever I mention it. I looked at schematics from Tek, HP, Fluke, Heath, etc and EVERYONE expresses UC K as 1000. The latest schematics I have dated in 1990's for the Fluke 87 have resistors expressed as, for example, 2.2K. Now I understand and accept that UC K also is for Kelvin. But over here it also stood for multiplier 1000. Right, wrong, or indifferent that's the way it was. I can't tell you if it's still used that way or not because we can't get schematics anymore. And as I keep mentioning...any draftsman worth his salt will have notes indicating what the specific symbology means. So I ask you...if that's done and it's understood what's the big fucking deal?
1000 times this, it is what I was taught at college and has been printed in every text book I have read. I really cannot understand why people don't know what the letters stand for, it is international standards and if they really cannot understand what k, M, p, m, n, G etc mean then bloody well google it, 5.7M to me says it all, but 5M7 makes me think that some silly arse has mistyped it
That's why it's important for the draftsman to have good notes on his schematics which specify what parameters are used. Here's an example of a schematic I drew up for my own use. The notes specify for example resistor parameters and specifically that "K" means 1000.