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Laser Etched 555 timer.?
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darky8:
Well this is nuts. I have no idea why you would do this. I know wiping all traces of certain ICs is common place, but a 555.?
jpanhalt:
Are you sure it's a 555 and not something like a PIC12Fyxxx?  If in doubt, check pins 1&8,  PIC's are reversed from 555's.
darky8:
I thought about that. But It's being used to drive a piezo atomiser in a model steam ship a friend is building. One of these magazine things, I think a PIC would be overkill for funnel effect.

Here's a better pic, it's single sided.
tooki:
Or it’s a custom IC made for that purpose.

Anyhow, a 555 timer isn’t cheaper than a very cheap MCU. It’d be more surprising if it were a 555 timer, given that it also needs more support components than an MCU.
darky8:
It has to be more along the lines of this.

Unfortunately I don't have it to test right now.

https://hackaday.com/2020/08/21/cool-off-with-a-piezo-and-a-glass-of-water/
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