he he he
I have installed new comparator and found that optical interrupter CPI-250 has open diode
I can confirm that comparator works touching pcb gives me frequency change, but instead of nice square form it has some 1% duty cycle signal on output.
Now i only found it sensor on aliexpress and ordered it.
While it will fly from distant galaxy i will try find substitutes on major parts suppliers.
I should have more than digikey account.