Yes, with car has occured really unpleasant embarrassment... Probably I powerfully overheated under sun in that day 
I have a microscope and I certainly will look a board.
But I have placed the board in refrigerator today, where it has coolled off to +2 C. Frequency went up to 18,9 kHz. Presently it became warm and frequency returned to 18,72. That is why I suspect that capacity of capacitor changed from temperature that is finally reflected on frequency.
As far as is such change of frequency critical for work of this device?
Thank you for your offer to take a look at device. This is really noble. But I live in Eastern Europe, and now a not most suitable time for such sendings for me.
Thanks againe, Technos!
Eugene.

I have a microscope and I certainly will look a board.
But I have placed the board in refrigerator today, where it has coolled off to +2 C. Frequency went up to 18,9 kHz. Presently it became warm and frequency returned to 18,72. That is why I suspect that capacity of capacitor changed from temperature that is finally reflected on frequency.
As far as is such change of frequency critical for work of this device?
Thank you for your offer to take a look at device. This is really noble. But I live in Eastern Europe, and now a not most suitable time for such sendings for me.
Thanks againe, Technos!
Eugene.
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