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  1. CDRIVE

    The Day The Symbol Changed

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  2. CDRIVE

    The Day The Symbol Changed

    Hello Scott and welcome to Electronics Point. My point (a pun) of my last post was that I've never argued the existence of definitive symbols to define ground type. The point of my thread is that what is now internationally accepted as Earth Ground was universally used to represent Chassis...
  3. CDRIVE

    The Day The Symbol Changed

    There are times, actually most times when I wonder if some poster's actually read the thread title and text contained within the OP's original post or do anything but skip read through the subsequent replies. o_O Chris
  4. CDRIVE

    Data sniffing from a RS232/485 network

    Mike, the reality is that regardless of where you buy things,.. U.S., China, etc, damn near everything is manufactured in China and they're getting better at it and QC every minute of every day. Very few of the big solid state manufacturers actually make their products in the U.S. or native...
  5. CDRIVE

    The Day The Symbol Changed

    It was 1967 or 1968 and I was working at my first post Vietnam service job as a Jr. Tech at a Mil service depot refurbishing ARC34 aircraft transceivers. My supervisor came by my work bench, gathered up all my data sheets and replaced them with new ones. Attached to the new data sheets was a...
  6. CDRIVE

    The Day The Symbol Changed

    First let me welcome you to EP. You make a very good point regarding seeing a decimal point in small or poor print. For that reason I will agree that 4K7 beats the hell out of 4.7K. Unfortunately my preferred schematic editor is Tina Spice which is a European company yet does not provide an...
  7. CDRIVE

    Data sniffing from a RS232/485 network

    Hello Mike and welcome to Electronics Point. The friendliest tech forum on the planet. Mike the price on that dongle gave me heart palpitations! :eek: If there's a Chinese clone on fleabay (probably is) it will have the $ decimal point moved two decimal places to the left. ;) Chris BTW...
  8. CDRIVE

    simple Calculator

    What's your calculator going to do that's not currently available? Chris
  9. CDRIVE

    simple Calculator

    Uh, I don't think we have a forum section for that. Chris
  10. CDRIVE

    Headphone amplifier ground issue

    Is this is what you purchased for headphones?? PYLE PLMPA35 :eek: Chris
  11. CDRIVE

    simple Calculator

    I don't think I understand the question. If you're asking what's a good engineering calculator I can tell you that I'm a big fan of HP. I still have my old HP25 from the mid 70's. They employ RPN, which I prefer. I have nothing against Casio either. I used $25.00 Casio wrist watches down to 185...
  12. CDRIVE

    output of rain sensor

    Some info regarding capacitive rain sensors. http://www.elina-micro.co.il/pictures/files/Rain_sensor-datasheet.pdf Chris
  13. CDRIVE

    Clean square waves using a 555 timer?

    While there's nothing wrong with that circuit and it will produce a near 50% duty cycle, it won't cure his overshoot issue. For that he needs good power rail bypassing techniques, good ground plane and definitely not rely on results produced using a solderless protoboard. Also, if this astable...
  14. CDRIVE

    Clean square waves using a 555 timer?

    Dork, I didn't bother Googling it but I suspect there's no such class of IC found under the heading of "Engineering Chip" either. Then there's the "car project" comment, "where nothing matters"???!!! o_O Chris
  15. CDRIVE

    Clean square waves using a 555 timer?

    "Nasty Chip"! Is that a technical term? :rolleyes: I looked that spec up in the datasheets but I couldn't find it. Chris
  16. CDRIVE

    The Day The Symbol Changed

    I'm thinking you're right. If it weren't for the world becoming much smaller and definitely more global with the advent of the internet I don't think we'd be having this discussion. I think there's a pun in there! :D Anyway, I also did some digging and found a copy of the Amateur Radio Handbook...
  17. CDRIVE

    The Day The Symbol Changed

    1960? Hell, that was only yesterday! Here's a partial clip of my 1946 Hallicrafters SX42. And as I've stated I have early 1930's mil manuals drawn the same way. Come to think of it, my old RCA tube manual also used the same convention and so did my many printings of the ARRL Handbook. I also...
  18. CDRIVE

    The Day The Symbol Changed

    I would also think that here in the U.S. schematic symbols are also cataloged by the National Bureau Of Standards (NBS). Your image is essentially the same as the one I posted in post 1. Thus far in this conversation I'm still left with a big ? as to when and why the Earth GND symbol became...
  19. CDRIVE

    The Day The Symbol Changed

    When I want to indicate that circuit GND is connected to a earth ground I will insert this in my schematic. Yes, according to current conventions, it's backward but I don't care. I'm too damn old to change now. That's the way it was for my entire life and I have sh!t loads of old schematics to...
  20. CDRIVE

    The Day The Symbol Changed

    Somewhere over the past 60 years, ... possibly in between the Vodka's, Gin, Wine, Beer and wacky weed I seem to have missed the 'Symbol Change Memo' of what we used to call "Chassis Ground". The term "Chassis Ground" also morphed a bit with the advent of the PCB. This naturally gave birth to the...
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