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Simple PCB Building Method

Discussion in 'Electronic Basics' started by amdx, Feb 16, 2013.

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  1. amdx

    amdx Guest

    I ran across this video. In it the build puts together a PCB using small
    pieces of PCB superglued to a larger piece. Not a new method,
    but beginners may find it useful.
    Years ago I purchased some Rogers Duroid pcb, it is 1/32" and teflon.
    I use a paper punch or a leather hole punch to make small discs of pcb.
    The Teflon material makes it very easy to punch. It is much easier than
    making small squares with FR4 material.



    I have no comment on the FM transmitter quality.
    Mikek
     
  2. Or you can use a "Dremel tool" and cut away islands in the copper.

    But the only reason such "pads" are useful is if you need to put it in a
    small space, so the parts need to be close to the board.

    Otherwise, just build it up above the board. The components going to
    ground provide a platform for the other parts, and as some have pointed
    out, if there's a point that needs support but doesn't have a component
    going to ground, you can use a high value resistor, that won't affect the
    circuit.

    It makes it really easy to change things, or for breadboarding, you just
    desolder the parts and start again. I had one piece of circuit board that
    I used for such breadboarding, I used it endlessly.

    If it's for a finished product, assuming it will be put in a box, then how
    "messY' it looks never matters.

    Michael
     
  3. It's only good if there's enough capacitance, and only good if you
    actually want to bypass there.

    What is good is that since the board being used is intact, there is a good
    ground surface, and available wherever you need it. So leads to ground
    can be short, unlike point to point wiring on perfboard, or the days of
    wiring on chassis where the ground points were wherey you had a nut and
    bolt and a solder lug.

    But a pad in itself won't provide enough capacitance for a bypass
    capacitor unless the frequency is quite high, or you have really large
    pads.

    The good thing is that they don't provide much capacitance, so except at
    higher frequencies, VHF and UHF, they won't interfere with most circuits.
    You don't want the signal to your trnasistor bypassed to ground, which is
    what would happen if this actually provided good ground and you had a pad
    for the base of the transistor.

    And that's a whole different thing, way high up in the microwave range
    where small value capacitors are large enough to be bypass capacitors.
    Playing with microwave can be hard since lead length becomes significant,
    but playing at microwave can be easy since required capacitance is so
    small that you can build things like bypass capacitors (K1CLL used to do
    endless things in this area, using copper strip and teflon insulators) and
    variable capacitors, the small values needed making it easy to make them
    yourself.

    Michael
     
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