SMD Reflow Process
Step by Step

Build a screen printing frame by taping some plain PCB pieces on a fat table

Align the screen printing stencil on the PCB and fix with a tap. Then put some solder paste on top of the stencil.

With a scraper press the solder paste through the holes

Carefully remove the stencil

This is how the PCB with the solder paste on the pads looks like

Now pick the SMD parts and place them on the pads. Be carefull not to smudge the solder paste,

This is how the PCB with the parts assembled will look like.

Put the PCB in the cold pizza oven

We used a DIY tempreature contoler (based on a Arduino with a solid state relais) to control the reflow profile.

Multiple PCBs cooking - nice

Et voila - the finished Open-Theremin Print