1. Find a suitable crystal oscillator
1. Crystal oscillators have round heads and wide and flat ones. Some may not be able to close the casing after installation
2 , there are many crystal oscillator frequencies, the U disk crystal oscillator frequency is 12M
2. Find a suitable soldering iron
1. The power is appropriate, because the U disk solder joints are relatively small, the soldering iron power is 25W It is advisable
2. It is best to use a soldering iron with a round tip
3. Pay attention to grounding when welding to prevent static electricity from penetrating the U disk chip