10. Install volume control RV1, headphone jack J3, and switch S1
These parts are simply inserted into the PCB and soldered. Some may snap into the PCB
and stay put, and some you may need to use tape or your fingers to hold it in place while you
solder them in:
Make sure you have the parts seated all the way down on the PCB before fully soldering
them in. It's best to solder only one lead, then inspect the part to see if it is fully seated on
the PCB. If not, heat the solder joint while pushing the part into the PCB.
