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Thread: HU Quality AM/FM RDS/RBDS Radio with Features

  1. #371
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    Hey,

    The first look on the almost finished PCB design.


    btw the gnd areas aren't drawn yet for the criticy just to be clear

    Regards,
    Rogier
    Professionals built the Titanic, an amateur built the Ark.

  2. #372
    Maximum Bitrate Marsupial's Avatar
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    schweeeeete.

    how's the antenna going to be attach? (I know close to nothing about antennas, sorry)

    Also, the chips, won't those be hard to solder for a DIY kit?
    -Mars

  3. #373
    Constant Bitrate Ill1's Avatar
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    Chips aren't hard to solder in as long as you don't solder the chip directly to the board. That usually causes the chip to burn up. You would solder a chip holder (don't know the exact name) to the board and then insert the chip in the correct orientation.
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  4. #374
    Registered User mpattonm's Avatar
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    Quote Originally Posted by Ill1
    ... a chip holder (don't know the exact name) ....
    Its called "socket", just to be precize.

  5. #375
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    It would be difficult (impossible?) to find a small, inexpensive socket for a surface mount IC to fit on that board (without interfering with nearby parts). It really isn't too difficult to solder the IC to the board, just have to an iron that won't cook everything. One method that is often used for smaller pitch IC's is to solder one whole side together (lined up correctly), regardless of shorts. Then just use solder wick to remove the excess solder. Believe it or not, IC's come in much denser packages than even those on this board (from what the layout looks like, at least).

  6. #376
    Maximum Bitrate Seth's Avatar
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    Quote Originally Posted by Ill1
    Chips aren't hard to solder in as long as you don't solder the chip directly to the board. That usually causes the chip to burn up. You would solder a chip holder (don't know the exact name) to the board and then insert the chip in the correct orientation.
    There are no sockets for those SMD chips. THT variants of those chips have some disadvantages :

    1) They are huge
    2) THT technology intoduces self-capacitance in the soldering points and parasitic resistance due to the size of the pins in RF circuits.

    The key is to use a low wattage soldering iron (~30W), a magnifier lamp and lot's of patience.....and don't drink coffee...

  7. #377
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    hm will there be a completely assembled board or a ready for sale product? because i dont trust my soldering skills
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  8. #378
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    The antenna will be the normal socket used on car radios and will be connected by a short shield wire.

    The IC used here are fairly easy to solder if you keep a few points in mind. First like Seth said is a low power solder iron with a fine tip. Fine solder wire 0.7mm max.

    Normally the PCB has a tin layer on the pads and wires, so you put the IC on it line it up precisely and solder pin 1 and the last pin = the one opposite diagonal. then you solder the rest. best to solder a few pins and let the IC rest for a while to cool down. SMT is more sensitive for heat then normal components. Sometimes a second pair of hands can be useful.

    If everythings goes well i will try to make a prototype this weekend and post some pictures of it.
    Professionals built the Titanic, an amateur built the Ark.

  9. #379
    Raw Wave rando's Avatar
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    A prototype? YES!!!!!!

  10. #380
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    you have made one????

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