Identify Which Chip Capacitor Is Crying by Straw.

When some chip on my PCB makes a noise as GEE GEE ...

I identify it by using plastic straw.

for reference ：

Why does acoustic noise occur in ceramic capacitors?

Examples of Noise Countermeasures

Step 1:

Insert this side into my earhole.

Step 2:

Touch every chips by another side of straw.

Then I can identify the crying chip.