An important update.
I didn't check this before, because I was thinking on a bigger picture, but... today for 2h or so, I was desperately trying to find a way of measuring the frequency.
I have 2 instruments here:
Number 1, the famous golden boy toy
DSO 138 Oscilloscope
that is showing the waveform alright but
it doesnt put the numbers !
Or at least I don't think I know very well how to get them from only its waveform.
And number 2:
GM328A Transistor Tester
And I completely forget I have a fv counter build in, until I checked its menu today. And I checked its manual as well and it doesnt say anything useful for my problem with fv counter. I had to literally guess every port it has, and multiple times, switching polarities, and all that shi...fun. But looking now more carefully on its naked picture posted here, I noticed it has a BACK port as well.... I have a cardboard cover on him, I made it myself and I didnt see the back port. Oh my god. Haha. And indeed that was the Input port for the frequncy counter. Ohoha. What a ride. Im happy to report I have a way of measuring the fv now. But this is also limited 1Hz-2MHz. But it is good I discovered this somewhat hidden functionality. I had a very vague idea I have something related to frequency counting but I was not very sure what I had. It appears I read its menu some years ago and something remained like a shadow memory about it. Im so Lucky I even remember it. Those who have this functionality ready build into your osciloscope, kiss all his 4 rubber feet !
The fv counter that is coming should be much better than this one I have, 1Hz-50MHz.... Hmmm now that I can see and compare the 2, its not that bigger difference. I should have something to Giga or TeraHz, to really see a difference. Eh well.
What a experience.
So, I measured my newly PWM with the 555, @5V, and I got 953Hz(max) to 850Hz(min). So 100Hz range. It was not the reading I was expecting. But I had planB, with a astable flipflop, also @5V and that give me straight 9Hz not variable. So I tested 2 diferent pulsating and oscilating devices that I know for sure their value and that they work. I wished I had a more larger fv range with my 555 PWM.
Im thinking to make another board that is a pure frequency variable generator with greater range than 100Hz and not a PWM. I also think what I have already is good enough as well. So this new board remains in plan.
I am thinking out loud here a bit... thinking a little bit more on my options, I also have a fv generator in my small GM328A. But the problem is that I also have to measure with it as well, so I should have 2 of these GM328A, one for fv gen and one for fv counter.... hmmm. But the other fv counter is arriving so in theory, this GM328A can be the fv gen and that will be the fv counter. So 2 devices after all. I didn't stop to analyze these problems until now.
In conclusion, Im good. Haha.