Crest model 4G-250-3, early 90's vintage.
Part numbers have been sanded off all ICs.
It would be great to find a schematic...
Thanks.
Crest model 4G-250-3, early 90's vintage.
Part numbers have been sanded off all ICs.
It would be great to find a schematic...
Thanks.
So they will not have released a schematic. Perhaps Google/Images with something like "ultrasonic cleaner" pcb and maybe find something rebadged, with extant markings. As the power side of UCs seems to be unsually IC free, even more likely in 1990s, any ICs would probably be just for timing and control, so isolatable if lucky
Plus side of IC grinding is that they probably used industry standard CMOS/555/etc rather than ASICs/PICs and similar that would need no sanding off
The DIP-8 I'm focusing on right now looks like it might be a standard dual op-amp. Analyzing the circuit to see if there's anything special that the op-amp needs to handle...
High frequency op amp most likely.
IIRC the ultrasonic foggers use 1.67 MHz and the smaller ones use around 30-40 kHz (thanks Sam!) but 67kHz is becoming popular as it is less likely to interfere with other devices and is more effective for cleaning.
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