I`v built fig12 and fig6 on breadboard, and noticed that at the output from A26(74122) duty cycle is not fully variable, it varies in steps. Is that as it should be ?
I attached the waveforms i`m having at some points of the circuits
HM
the very last 20 seconds of your video shows the correct action of the duty cycle of the gated signal.....this gated signal will be overlaid or superimposed on top of the pll output so that the pll frequency (whatever that ends up being, based on what kind of water you use) will only show up under the square waveform but not on top of it
The gate signal blocks out a percentage of it per cycle
(you may already have guessed that, but im stating it here for beginners)
looks good... nice sharp corners, clean signal
if you dont use signal K or the safety circuit (figure 11), you can leave out the extra parts between the 74122 and output "A"