Easy vias on homemade double sided PCBs

in PCBs by Ian | 5 comments

Double sided home-etched PCBs require a lot of patience and luck. Both sides need to be aligned properly, and via wires have to be soldered between the layers so top and bottom are connected.

The usual process for connecting the layers is to insert a small wire in each via hole and solder it.  This is a tedious, time consuming process. YourITronics documents another way: thread a long wire through all the holes, solder it in place, and cut away the excess. The result, as seen above, is a very small, very clean via connection. There’s even a few under the TQFP chip! We’ll definitely use this tip the next time we make a double sided board at home.

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Comments

  1. s3c says:

    This is actually a pretty good idea, should save a couple of minutes.

  2. Laen says:

    Wow. There are really some under the TQFP chip? Aren’t those chips usually flush with the board?

  3. CazH says:

    Nice tip, been doing these kinds of boards at work for years now and never thought of this. We use these boards for prototypes and other dev tools and makes loads of them, this is gonna help me a lot, always hated vias :P

    /CazH

  4. ril3y says:

    I do the same thing with my laser etched pcbs.

    @laen, no TQFP’s sit a bit off the board. I route through the corners all the time.

    SEE:
    http://www.flickr.com/photos/rileyporter/sets/72157622690487871/

    Ril3y

  5. Bob Brandt says:

    I have found an even better solution, #20 Brass Escutcheon Pins available online from ebay or other sources. Drill holes through the board insert all the pins on one side, solder the the head (like a nail head) then turn the board over solder the other side cut off excess length.
    Just recently tried this, it was taking considerable time to do using any other process with wire.
    This can be done in minute for the whole board the head keeps the pin from falling through.
    Bob Brandt

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