Connect with us

BNC connector to board

Discussion in 'General Electronics Discussion' started by charnich, Mar 17, 2013.

Scroll to continue with content
  1. charnich

    charnich

    9
    0
    Mar 17, 2013
    HI, I'm trying to add a BNC connector to the control board of a machine that traces an eyeglass frame for a pattern to cut lenses so that I can add ARCNET functionality. I don't have much experience with soldering components to boards but I want to give it a go. Basically there is an cutout in the case about 10 inches from the solder terminal in the machine so I'll likely need a receptacle with leads. I'm attaching a pic of the board. Could anyone tell me what the solder point are for? Also, there is another solder point in close proximity titled "BNC" that stands alone. I see there are a variety of BNC connectors available and I'm not sure which one to get. Any advice is greatly appreciated.
     

    Attached Files:

  2. davenn

    davenn Moderator

    13,557
    1,854
    Sep 5, 2009
    Hi
    welcome to the forums :)

    Within the circles, the outer 3 solder points are for the GND terminals of the BNC connector. the centre solder point is for the centre pin

    You will just have to go through the farnell ( element14), mouser, digikey catalogs and see if they have one with 3 GND terminals .... not one I have seen before they are usually 2 pin or 4 pin GND terminal

    That other tiny point may be just a testpoint ... or may not even be connected to anything .... hard to tell without seeing the board up close and with a bright light behind the board to show up any tracks

    Dave
     
  3. charnich

    charnich

    9
    0
    Mar 17, 2013
    Hi Dave and thank you for the speedy reply! Do I have to use all 3 grounds or could I use something like this?

    http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_256832_-1

    I was thinking I could just connect the ground to 1 lead and the center to the other and route the wires to where I could mount the connector to the external case. Is there any reason I would need to solder the receptacle directly to the board?




     
  4. davenn

    davenn Moderator

    13,557
    1,854
    Sep 5, 2009
    well the link you gave shows an inline connector so its not going to mount on the case anyway.
    If you want to mount a connector on the external case you would need a bulkhead or chassis mount type socket ( not an inline type)
    Then if you do mount on the external case you will need a short length of coax NOT twinlead (as shown in that link)
    There are a number of coax cables available that are small diameter. Depending on what type of signal is going through that connector you may well be able to use audio screened lead instead of coax

    Dave
     
  5. charnich

    charnich

    9
    0
    Mar 17, 2013
    Oh I see. Just curious, what is wrong with twinlead in this sort of application?

    Thank you for your help.

     
  6. shrtrnd

    shrtrnd

    3,714
    469
    Jan 15, 2010
    The PURPOSE of coax over twin lead, is to reduce spurious signals from outside
    the circuit from interferring with the signal on the coax cable. It reduces outside radio
    frequency interferrence with the operation of your instrument.
    (The coax braid around the signal wire in the coax does that).
     
  7. charnich

    charnich

    9
    0
    Mar 17, 2013
    Oh I see. Thank you!

     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-