====== building an ultrasonic cleaner ======

This kit is NOT shoot and forget.
it's very sensitive (and dangerous), and DEPENDS on other parts,



1. get an ultrasonic kit, made of driver/controller, and funny bell shaped piezo things.  
They include weird little screws ("nipples"). We'll need them later.

2. choose a water container based on the **shape** & size of items you'll put in it.
every extra litter of liquid takes more power (and noise, and complexity).

3. the kit comes with "screws" or "bolts".
they need to be welded to the container (from the outside),
and the pizo-bell-shaped-thing are screwed to them.

soldering isn't easy AT ALL since liquid containers are very thin.
suggestion: use silver welding, with matching flux.  Pre-heat the screw-things and find a way to keep them in the same place while welding.

4. before screwing around, scratch the attachment surface, choose solid (non-elastic, non-flexible) glue, and apply to the entire contact area.

5. requirements:
timer (a must),
fans (a must)
switch,
DC power supply (for the fans)
AC power - for the pizo-thing.

consider an on-off-555-like mechanism to turn the thing on and off automatically, for long-duration operations.

6. main problem is heat.
So use fans (onlyfans.com for more info)

7. grounding is important,
in our 1 hour experiment, we burned 3 fuses, and i got electrocuted (I guess the pizo-thing accumulated a serious charge). Even with my shoes on.
so ground the water container. the driver/controller don't deal with grounding for some reason, so grounding is up to you.
i used the mains cable's ground.

8. use screws and welding.
the structure is vibrating, so simple soldering or funny weak attachment WILL BREAK.

10. seriously, make sure it's cold.

11. 


=== 9. testing: ===
put an aluminum foil in the water, and turn on.
in few (?) minutes, whole should appear in the foil.