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Thread: PropController Ethernet - Construction question

  1. #1
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    Default PropController Ethernet - Construction question

    Ben,
    I want to check Q1.
    I think your PWB footprint is wrong.

    I think pins 2 and 3 are swapped. On the PWB pin2 and connected to ground.
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    Last edited by Matt_Edwards; 06-11-2011 at 04:10 AM. Reason: added image
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  2. #2
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    Default Re: PropController Ethernet - Construction question

    Ahhh interesting, it looks like the text labels in the schematic are wrong. The collector, emitter, and base are all correct but the drawing isn't representing the pin assignments correctly.
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    Default Re: PropController Ethernet - Construction question

    My PCB works as soldered, matching the footprint on the PCB (some transistors can be made backwards though.)
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    Default Re: PropController Ethernet - Construction question

    Quote Originally Posted by chilloutdocdoc View Post
    My PCB works as soldered, matching the footprint on the PCB (some transistors can be made backwards though.)
    Well yes it will still work. Q1 configuration in the schematic is a "Common Emitter". If you fit Q1 as per the PWB overlay, Q1 configuration becomes a "Common Base". the sneaky thing is both will work, albeit with different characteristics.
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    Default Re: PropController Ethernet - Construction question

    This is just a text issue on the schematic, the PCB is correct.
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    Default Re: PropController Ethernet - Construction question

    Quote Originally Posted by DynamoBen View Post
    This is just a text issue on the schematic, the PCB is correct.
    Matt is right I am wrong, nice catch! The schematic is correct in that its wrong, that particular part has a different pinout than what appears in the schematic. I'm reving the board now.

    In addition as Matt pointed out the circuit will still function, its just not correct.
    Last edited by DynamoBen; 06-11-2011 at 10:59 PM.
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  7. #7
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    Default Re: PropController Ethernet - Construction question

    For your new layout, another thing to consider is the the centre pin is usually on curved side not the flat side of the component. In fact a fair number of transistors in TO-92 case come with their legs pre-bent in this format.
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  8. #8
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    Default Re: PropController Ethernet - Construction question

    Quote Originally Posted by Matt_Edwards View Post
    For your new layout, another thing to consider is the the centre pin is usually on curved side not the flat side of the component. In fact a fair number of transistors in TO-92 case come with their legs pre-bent in this format.
    I'll have to change the library for that one since this is the default pad config.
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  9. #9
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    Default Re: PropController Ethernet - Construction question

    So - - are you saying that for those that have built this (and I assume the DMX version as well) that this part has probably been installed incorrectly? I'm using the PropPlug so not too concerned about it myself but it would be good to know for others.
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    Default Re: PropController Ethernet - Construction question

    Quote Originally Posted by budude View Post
    So - - are you saying that for those that have built this (and I assume the DMX version as well) that this part has probably been installed incorrectly?
    It's installed correctly but two pins are swapped (2 & 3) on the PCB. Long story short, the board will function correctly even with this mistake.

    That transistor is used to toggle the reset on the prop when programming it. I've used this design with this mistake for 2 years and have never had an issue.
    Last edited by DynamoBen; 06-12-2011 at 12:22 PM.
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