Loading ...
Sorry, an error occurred while loading the content.

Re: [softrock40] Here We Go - My First Newbie Question

Expand Messages
  • Jerry Flanders
    I didn t need any oven, solder paste or any special technique - I got a strap-on magnifier thingie like
    Message 1 of 7 , Jan 1, 2007
    • 0 Attachment
      I didn't need any oven, solder paste or any special technique - I got a
      strap-on magnifier thingie like

      <http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=37586>http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=37586

      from my local Harbor Freight store and used a 100 watt lamp a foot
      away from the board for light. Then a spool of thin (.032) solder and
      my small soldering iron (mine is temp controlled) is all I needed to
      put my SR40 kit together. Worked first time!

      Get that strap-on magnifier and have at it - it is easier than you might think.

      Jerry W4UK

      At 10:44 AM 1/1/2007, you wrote:


      >First off, Happy New Year from our home to all of yours!
      >
      >Secondly, I have a question regarding SMT assembly as a
      >hobbiest. My experience with SMT was quite some time
      >back and involved commercial environments to include
      >SMT component placement and ovens of the commercial
      >level. Inspection used "stereo scopes" to inspect filets,
      >flow, etc.
      >
      >That said, just what are you folks doing to properly install
      >and solder the components to the board(s)? Do you bring
      >the kitchen oven or toaster oven up to around 375 Deg F
      >with a dial/digital thermometer inside or ??? Hmmm, I'm
      >wondering if I need to spend a couple of hundred dollars
      >for a suitable oven for the bench top?
      >
      >How are you applying solder paste without considerable
      >waste? Do you perform a post-solder fluxing step?
      >
      >How are the hobby assemblers inspecting their work?
      >Personally, my eyesight at 62 is just not good enough to
      >simply eyeball solder quality in SMT applications.
      >
      >What happens if there is a component shift during the
      >soldering creating misalignment or perhaps there is a
      >solder bridge or two?
      >
      >How much difficulty is experienced doing PCBs that have
      >components on both sides?
      >
      >That's it for now. Many thanks in advance for helping with
      >my learning curve.
      >
      >Regards,
      >
      >Howard W6IDS
      >Richmond, IN
    • Graham Haddock
      Howard: So far, I have not used or had to use an oven. I use a short conical point controlled temp (700 deg F) soldering iron, 0.015 dia Kester 44 solder, a
      Message 2 of 7 , Jan 1, 2007
      • 0 Attachment
        Howard:

        So far, I have not used or had to use an oven.

        I use a short conical point controlled temp (700 deg F)
        soldering iron, 0.015 dia Kester 44 solder, a lighted
        ring magnifying lens/lamp (for assembly), and a
        4X jewelers eye loope for inspection. For removing
        excess solder and bridges, use small size solder-wick.

        Use fine tweezers for holding and placing the chip parts.

        Anti-static mat and wrist strap for assembly of anything
        that is static sensitive.

        There are several tutorials on the web about hand assembly
        of SMT parts.

        For chip C and R, I put a small dot of solder on the board
        on one end, hold the part with tweezers while I reflow the
        solder with the soldering iron on that end. When the part
        is where I want it, go the the other end and solder it.

        For ICs, put a small solder dot on the board for one corner
        pin, hold the IC with tweezers until correct placement and
        then melt the solder at that first pin. If necessary, twist the
        IC slightly to get all pins to register, then solder one
        pin diagonally across the IC. Double check all registration.
        Adjust if necessary by melting solder at one or the other
        of the two soldered pins.
        If registration is OK, go down the row of pins on all sides
        soldering the pins. Excess solder and pin to pin bridges
        is OK at this point, most important is to solder each pin.
        Then, with solder wick, go back down each row and pick up
        the excess solder, and any bridges. You can get very a
        good looking IC installation this way.

        If you try to individually solder the pins on a fine pitch
        IC without pin to pin shorts, you will go nuts. The trick
        is to put a little extra solder on the pins, get good solder
        joints,don't care about bridges, then pick it up later with
        the solder wick

        --- Graham

        ==

        w6ids wrote:
        >
        >
        > First off, Happy New Year from our home to all of yours!
        >
        > Secondly, I have a question regarding SMT assembly as a
        > hobbiest. My experience with SMT was quite some time
        > back and involved commercial environments to include
        > SMT component placement and ovens of the commercial
        > level. Inspection used "stereo scopes" to inspect filets,
        > flow, etc.
        >
        > That said, just what are you folks doing to properly install
        > and solder the components to the board(s)? Do you bring
        > the kitchen oven or toaster oven up to around 375 Deg F
        > with a dial/digital thermometer inside or ??? Hmmm, I'm
        > wondering if I need to spend a couple of hundred dollars
        > for a suitable oven for the bench top?
        >
        > How are you applying solder paste without considerable
        > waste? Do you perform a post-solder fluxing step?
        >
        > How are the hobby assemblers inspecting their work?
        > Personally, my eyesight at 62 is just not good enough to
        > simply eyeball solder quality in SMT applications.
        >
        > What happens if there is a component shift during the
        > soldering creating misalignment or perhaps there is a
        > solder bridge or two?
        >
        > How much difficulty is experienced doing PCBs that have
        > components on both sides?
        >
        > That's it for now. Many thanks in advance for helping with
        > my learning curve.
        >
        > Regards,
        >
        > Howard W6IDS
        > Richmond, IN
        >
        > __._,_.
        >
        >
      • KD5NWA
        ... Below is a link to a tutorial on using a toaster oven to solder double-sided SMT boards. On the article is a link to sites with tutorials on two other
        Message 3 of 7 , Jan 1, 2007
        • 0 Attachment
          w6ids wrote:
          > First off, Happy New Year from our home to all of yours!
          >
          > Secondly, I have a question regarding SMT assembly as a
          > hobbiest. My experience with SMT was quite some time
          > back and involved commercial environments to include
          > SMT component placement and ovens of the commercial
          > level. Inspection used "stereo scopes" to inspect filets,
          > flow, etc.
          >
          > That said, just what are you folks doing to properly install
          > and solder the components to the board(s)? Do you bring
          > the kitchen oven or toaster oven up to around 375 Deg F
          > with a dial/digital thermometer inside or ??? Hmmm, I'm
          > wondering if I need to spend a couple of hundred dollars
          > for a suitable oven for the bench top?
          >
          > How are you applying solder paste without considerable
          > waste? Do you perform a post-solder fluxing step?
          >
          > How are the hobby assemblers inspecting their work?
          > Personally, my eyesight at 62 is just not good enough to
          > simply eyeball solder quality in SMT applications.
          >
          > What happens if there is a component shift during the
          > soldering creating misalignment or perhaps there is a
          > solder bridge or two?
          >
          > How much difficulty is experienced doing PCBs that have
          > components on both sides?
          >
          > That's it for now. Many thanks in advance for helping with
          > my learning curve.
          >
          > Regards,
          >
          > Howard W6IDS
          > Richmond, IN
          >

          Below is a link to a tutorial on using a toaster oven to solder
          double-sided SMT boards. On the article is a link to sites with
          tutorials on two other methods, "embossing air gun" and a "skillet"
          method for single sided boards only. Cash Olsen's site makes available
          small quantities of soldering paste, it goes a long way.

          You should never use a oven or a skillet for cooking food once you have
          soldered boards in it, unlike you like the idea of lead poisoning and
          insanity. A gas oven would be useless anyway since to solder the parts
          and not damage them you temperature must be controlled and go up at a
          controlled rate, a large home oven is not capable of doing that.


          < URL:http://www.hpsdr.com/Public/Projects/SMT/SMT.html >

          --

          Cecil
          KD5NWA
          www.qrpradio.com www.hpsdr.com

          "Sacred Cows make the best Hamburger!" Don Seglio Batuna
        • FRANCIS CARCIA
          I lay a hunk of solder next to the first joint so there is a bit of flux to make the connection. Graham Haddock wrote: Howard:
          Message 4 of 7 , Jan 1, 2007
          • 0 Attachment
            I lay a hunk of solder next to the first joint so there is a bit of flux to make the connection.

            Graham Haddock <GrahamH@...> wrote:
            Howard:

            So far, I have not used or had to use an oven.

            I use a short conical point controlled temp (700 deg F)
            soldering iron, 0.015 dia Kester 44 solder, a lighted
            ring magnifying lens/lamp (for assembly), and a
            4X jewelers eye loope for inspection. For removing
            excess solder and bridges, use small size solder-wick.

            Use fine tweezers for holding and placing the chip parts.

            Anti-static mat and wrist strap for assembly of anything
            that is static sensitive.

            There are several tutorials on the web about hand assembly
            of SMT parts.

            For chip C and R, I put a small dot of solder on the board
            on one end, hold the part with tweezers while I reflow the
            solder with the soldering iron on that end. When the part
            is where I want it, go the the other end and solder it.

            For ICs, put a small solder dot on the board for one corner
            pin, hold the IC with tweezers until correct placement and
            then melt the solder at that first pin. If necessary, twist the
            IC slightly to get all pins to register, then solder one
            pin diagonally across the IC. Double check all registration.
            Adjust if necessary by melting solder at one or the other
            of the two soldered pins.
            If registration is OK, go down the row of pins on all sides
            soldering the pins. Excess solder and pin to pin bridges
            is OK at this point, most important is to solder each pin.
            Then, with solder wick, go back down each row and pick up
            the excess solder, and any bridges. You can get very a
            good looking IC installation this way.

            If you try to individually solder the pins on a fine pitch
            IC without pin to pin shorts, you will go nuts. The trick
            is to put a little extra solder on the pins, get good solder
            joints,don't care about bridges, then pick it up later with
            the solder wick

            --- Graham

            ==

            w6ids wrote:
            >
            >
            > First off, Happy New Year from our home to all of yours!
            >
            > Secondly, I have a question regarding SMT assembly as a
            > hobbiest. My experience with SMT was quite some time
            > back and involved commercial environments to include
            > SMT component placement and ovens of the commercial
            > level. Inspection used "stereo scopes" to inspect filets,
            > flow, etc.
            >
            > That said, just what are you folks doing to properly install
            > and solder the components to the board(s)? Do you bring
            > the kitchen oven or toaster oven up to around 375 Deg F
            > with a dial/digital thermometer inside or ??? Hmmm, I'm
            > wondering if I need to spend a couple of hundred dollars
            > for a suitable oven for the bench top?
            >
            > How are you applying solder paste without considerable
            > waste? Do you perform a post-solder fluxing step?
            >
            > How are the hobby assemblers inspecting their work?
            > Personally, my eyesight at 62 is just not good enough to
            > simply eyeball solder quality in SMT applications.
            >
            > What happens if there is a component shift during the
            > soldering creating misalignment or perhaps there is a
            > solder bridge or two?
            >
            > How much difficulty is experienced doing PCBs that have
            > components on both sides?
            >
            > That's it for now. Many thanks in advance for helping with
            > my learning curve.
            >
            > Regards,
            >
            > Howard W6IDS
            > Richmond, IN
            >
            > __._,_.
            >
            >


          • Bill Dumke
            Howard, Use plenty of rosin flux. You can buy it from DigiKey or Mouser in a syringe. You can also apply it with a toothpick. I put some on each pad I am going
            Message 5 of 7 , Jan 1, 2007
            • 0 Attachment
              Howard,

              Use plenty of rosin flux.  You can buy it from DigiKey or Mouser in a syringe. You can also apply it with a toothpick. I put some on each pad I am going to solder.  Then after I am done soldering, I wash the flux off with CRC Brakleen, the red can version.  But do it out of doors.  You can get this at any auto parts store.  It works great on rosin flux.  The old fashioned flux cleaners such as trichlor are difficult to get these days due to health risks.  And I have found the expensive electronics supply house flux cleaners don't work any better than Brakleen, anyway.  A side benefit of washing the flux off is you can detect the solder bridges a lot easier, as well as giving more integrity to high impedance and low capacitance circuits.  You can also use a Q-tip swap to help clean up as well. 

              Bill WA9PWR

              w6ids wrote:


              First off, Happy New Year from our home to all of yours!

              Secondly, I have a question regarding SMT assembly as a
              hobbiest. My experience with SMT was quite some time
              back and involved commercial environments to include
              SMT component placement and ovens of the commercial
              level. Inspection used "stereo scopes" to inspect filets,
              flow, etc.

              That said, just what are you folks doing to properly install
              and solder the components to the board(s)? Do you bring
              the kitchen oven or toaster oven up to around 375 Deg F
              with a dial/digital thermometer inside or ??? Hmmm, I'm
              wondering if I need to spend a couple of hundred dollars
              for a suitable oven for the bench top?

              How are you applying solder paste without considerable
              waste? Do you perform a post-solder fluxing step?

              How are the hobby assemblers inspecting their work?
              Personally, my eyesight at 62 is just not good enough to
              simply eyeball solder quality in SMT applications.

              What happens if there is a component shift during the
              soldering creating misalignment or perhaps there is a
              solder bridge or two?

              How much difficulty is experienced doing PCBs that have
              components on both sides?

              That's it for now. Many thanks in advance for helping with
              my learning curve.

              Regards,

              Howard W6IDS
              Richmond, IN

            • kerrygeek1
              I used the method on Cash Olsen s web site using the hot air gun, solder paste and a coffee cup warmer. I got the heat gun locally on sale at Hobby Lobby for
              Message 6 of 7 , Jan 1, 2007
              • 0 Attachment
                I used the method on Cash Olsen's web site using the hot air gun,
                solder paste and a coffee cup warmer. I got the heat gun locally on
                sale at Hobby Lobby for $12 and the cup warmer at Walgreen's for
                $3.00. I ordered the solder paste from Cash on his web site, so far
                we've used it to build 2 boards and haven't even made a dent in it.

                I'm no spring chicken either (47 next month) but a pair of cheapo
                reading glasses (also from Walgreen's) and a gooseneck light clamped
                to the edge of the desk was all I needed. I borrowed a lid of a cake
                pan to keep the parts from rolling off the desk, it's now back in the
                kitchen and my wife didn't even miss it.

                Don't worry about the smt parts, I was sweating it but it was actually
                the easiest part of the project. I was wishing more of the board was
                SMT. The other parts took much longer than the SMT parts.

                73,
                Kerry


                --- In softrock40@yahoogroups.com, "w6ids" <w6ids@...> wrote:
                >
                >
                > First off, Happy New Year from our home to all of yours!
                >
                > Secondly, I have a question regarding SMT assembly as a
                > hobbiest. My experience with SMT was quite some time
                > back and involved commercial environments to include
                > SMT component placement and ovens of the commercial
                > level. Inspection used "stereo scopes" to inspect filets,
                > flow, etc.
                >
                > That said, just what are you folks doing to properly install
                > and solder the components to the board(s)? Do you bring
                > the kitchen oven or toaster oven up to around 375 Deg F
                > with a dial/digital thermometer inside or ??? Hmmm, I'm
                > wondering if I need to spend a couple of hundred dollars
                > for a suitable oven for the bench top?
                >
                > How are you applying solder paste without considerable
                > waste? Do you perform a post-solder fluxing step?
                >
                > How are the hobby assemblers inspecting their work?
                > Personally, my eyesight at 62 is just not good enough to
                > simply eyeball solder quality in SMT applications.
                >
                > What happens if there is a component shift during the
                > soldering creating misalignment or perhaps there is a
                > solder bridge or two?
                >
                > How much difficulty is experienced doing PCBs that have
                > components on both sides?
                >
                > That's it for now. Many thanks in advance for helping with
                > my learning curve.
                >
                > Regards,
                >
                > Howard W6IDS
                > Richmond, IN
                >
              Your message has been successfully submitted and would be delivered to recipients shortly.