The SMD happy Face is a great kit to practice soldering Surface Mounted Devices (components are mounted onto the surface of printed circuit board). I soldered these components by tinning one pad with solder, with tweezers applying the component and reheating the solder to mount, lastly, soldering the other pad(s) to connect the component to the PCB. As one can see in the first picture SMD can be very small. The 2 Transistor and 2 LEDs are size SOT-23 (2.9 mm x 1.3 mm/1.75 mm x 1.3 mm). The 4 Resistor are size 2012 (2.0 mm x 1.25 mm). The 2 Capacitor are size 3225 (3.2 mm x 2.5 mm). These components create a Astable Multivibrator Circuit or Oscillator producing a square wave. This makes the LEDs blink on and off. Below the video are a few links that I used as reference and for more information about this fun technology.
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| Top to bottom Resistor, Capacitor, LED, and Transistor. |
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| One side of the resistor soldered. |
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| Tinned Resistor pad. |
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| Tinning Transistor pads. |
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| Assembled Happy Face. |
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