antto wrote:then, after D24 it is basically waveshaped slightly
R46 reduces it's amount a little
IMHO, I saw wavefroms which resembled that at D24 and R46. Vpp at D24 was 1,04 volts and 0,720 volts at R24 according to my notes.
so at C13 it should look like this:
I am not sure if I see waveform which is exactly like that at C13. The signal is quite weak at it (the picture says that Vpp is 0,036, but I in my notes I have written 0,08 volts):
However, I am not yet that familiar with oscilloscopes, so I may be doing something wrong. I used heatsink of 7805 on IO board as a ground reference in all my measurements. I am not sure if that was OK.
I removed C13 and checked using multimeter that the capacitance of it was about 1 uF.