Sorry I wasn't clear. I measure with DC setting.
I don't actually know what is input circuitry of my voltmeter.
Also there's this transistor that won't go high, no cap involved just diode. (even at low 14kHz)
It works fine without the diode.
Sorry about the title, I should have named it: diode recovery.
Little later I remembered MOSFET datasheet that gives graph of diode recovery.
I found on the net that diode cant turn off immediately because electrons and holes
have to go back to their regions.
So if I have to use diode on my "clock" line, how do I get rid of recovery charge???