Electronics > Beginners
How do IR remotes wake up on key press?
Ian.M:
NA could variously be nA - nanoAmps, or N/A - Not Applicable.
In this case I think Mechatrommer is misusing it instead of DNP - do not populate (optional components on the PCB layout but not fitted). It would be vastly preferable to also give the value e.g."DNP 10K" so you know what should be fitted there if it does need populating.
Mechatrommer:
--- Quote from: sokoloff on September 08, 2019, 11:24:43 am ---Does "NA" mean "0" or infinite or something else? (I'm a struggling beginner at analog electronics.)
I think it can't mean 0, but I'm not totally sure.
--- End quote ---
sorry. thats a beginner work who stubbornly cant take advice from an expert, NA means Not Available (Not Applicable as Ian spotted), i mean... it can be Not Installed. it is there in case the nodes floating high due to some stray effect (resulting gp high and turning the circuit ON all the time), then i have to install pull down resistors. i'm dealing with less than ideal flux and solder element here. or simply just forget about it, the important idea is how the switching ON/OFF is made.
amyk:
--- Quote from: Ian.M on September 08, 2019, 12:52:22 pm ---In this case I think Mechatrommer is misusing it instead of DNP
--- End quote ---
That's not the only thing misused in that "schematic"...
Hint: a bunch of disconnected parts with net labels is NOT a schematic.
Ian.M:
That's the modern OSHW 'style'. If us old farts that are used to being able to follow a wire on a paper schematic without needing an ecopy of it and a compatible viewer that can hilite by net name, went postal on all the young designers using it, we'd all be doing serious jail time and there'd be no-one left who actually remembers the hands on experience of the design lessons of the 20th century.
Mechatrommer:
yeah sorry if its hard on some people. i didnt know about the DNP, NA or N/A is much more understandable in any discipline imho. unfortunately i kinda dislike DNP because its too sounds like DXP (Altium executable :P) sorry. even NA is not really what i meant. what i want is "Populate If Necessary" (PIN) or "Do Not Populate But Please Do If Necessary" (DNPBPDIN) or (DNPBPIN) but that will make nomenclatures much worst.
i'm aware about those old style schematics, its neat in one single unit but man, for me its hard to trace or explode smaller circuit units into separate logical circuits. i dont have to take complex circuit like HP/Agilent/Tektronix DSO or PSU, things like alm's PSU in the other thread is hard to understand for ee noobs like me. i have to bend neck 90 and -90 degrees trying to understand what this transistor do and to where its connected logically, i never managed to understand it until today, people who made his circuit i guess is just blind copy paste it onto their circuit, or knowledgable enough first hand, in harser word maybe too clever or too stupid.
furthermore, with the era of embedded/mixed signal circuit and EDA, disconnection is inevitable, to avoid spagethiness. we can check how Dave made the schematics in his video, a slight component addition to the old style circuit will be a nightmare, deleting and repopulating traces, rearranging component etc, at least for me. so somehow these aspect have educated me, the not original ee-born chap. in the schematics i linked, you can just make a selection box around those resistors and make it disappear (cut) and the circuit still applies.
i know earlier generations are too meticulous and persistent with their work. with eraser, pencil and ruler (this includes mechanical CAD/drafting work) they are well respected, but this is EDA/CAD/CAM age, new generations maybe including me got stiffer, heavier and lazier arse esp if one is a Mechatrommer (3 in 1 master of none) :-\ this is off-topic btw. cheers.
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