Thinking_J

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Design products for many industries


Thinking_J

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  • 02.13.2017
  • Make schematic symbols understandable
  • Paul, While I agree with most of your observations/concerns... I would like to make a few of my own. - Schematics are NOT preliminary pcb layout tools! They (like text based solutions) are never going to provide All the information required for a good pcb layout! So please people stop trying to make a schematic be EVERYTHING to the design. Just make symbol connection points being mindful of how they are most likely to be connected on a schematic (and yes, as suggested, if graphics are helpful - USE THEM) - When creating a schematic.. Your personal preferences, while important, are not the point.. it's purpose is to communicate the circuit's function to others that will be reading it. Namely technicians and other engineers. Granted if the schematic makes sense to you.. it will more likely make sense to others. The point: try to be mindful of the audience that will use the schematic. - while I agree that the signal paths should "flow" as much as possible (connectors broken up into smaller items)... sometimes the primary audience for a schematic will be the people involved in simply wiring it into a bigger system. With their only concern: the creation of the wiring loom (physical location without any concern for it's actual function) Often these situations call for a single schematic page (among the others) that simply shows all the external connections for the entire product, with ported signals to the schematic pages with appropriate "flow" of the signals within each of these pages. (with any appropriate notation) The one time where trying to communicate a physical location on the product.. makes sense. And please use appropriate naming conventions for signals. Most of us.. know a good schematic when we see it. Fewer (apparently).. know how to structure a schematic to convey it's function clearly.
  • 01.10.2017
  • Protect your boost converter
  • Clever design.. Me .. being nit picky... - The schematic would be more readable if the intrinsic diodes inside of T1 and T2 were shown within their symbols. - I thought we had all agreed upon Q for transistor designation? (T was for transformers) - PLEASE people!!! don't make 4 way connections on a schematic! That connecting dot isn't always apparent. Just asking for confusion and wiring mistakes. A clever design regardless...
  • 01.10.2017
  • Protect your boost converter
  • Clever design.. Me .. being nit picky... - The schematic would be more readable if the intrinsic diodes inside of T1 and T2 were shown within their symbols. - I thought we had all agreed upon Q for transistor designation? (T was for transformers) - PLEASE people!!! don't make 4 way connections on a schematic! That connecting dot isn't always apparent. Just asking for confusion and wiring mistakes. A clever design regardless...
  • 08.21.2012
  • What’s your (single) point, youngster?
  • A classic story. A lot of reasonable methods of reducing (but never eliminating) the possibility of this kind of error. - use of zero ohm resistor in schematic to tie agnd to dgnd. - visual tools . (some cad systems) to see current density distribution during simulation. - wisdom of the person doing the pcb layout. But it was ultimately a real world test .. that detected the problem. Real lessons: - always be willing to listen (not just hear) - never depend upon any single methodology to prove a design - respect your elders! georgeg759.. I also get a bit nervous with designs that require really high impedance resistors. Easy to see long term / environmental changes impact things.
  • 01.14.2017
  • CES 2017: 29 intriguing products
  • 3 items... Someday.. (sigh).. I would like to believe humanity will collectively be educated enough to recognize excess marketing hyperbole as something to be viewed with disdain. Pics.. still not coming though (Firefox)... and for some reason the rest of the content is unusually slow. Teen sharing his "tunes" on the flight.. Next time.. Simply ask the flight attendant to address the situation. You shouldn't have to.
  • 01.03.2017
  • Be careful what you name your company
  • Another interesting example: APPLE. Look at the problems that arose when Steve Jobs decided to provide music on the internet. Their long standing agreement and separation from the company the Beatles founded (Apple Records) became broken. A very expensive legal battle ensued... Very hard to predict the problems a name choice will cause.
  • 01.03.2017
  • Be careful what you name your company
  • Naming a company? Trying naming a band... Both can require a very large effort. and both can be very "emotional" Then you have to determine if the name has been copyrighted already.... Important.. but ultimately educated guess work. Who would have thought in the early 60s.. "Beatles" would work as a name?
  • 12.19.2016
  • Proprietary AC/DC adapters: Good idea or nasty trick?
  • Engineer: he who can create with $1 what any fool can create with $2 German engineering: designed to last forever... price is no concern. Japanese engineering: designed to last a long time.. with price being a major concern. American engineering .. we can't decide which customer to design for.