The flip flop frequency mixer is very useful since it ,makes only perfect pulses to come out from it, so you can simply use it as a dave lawton circuit.
you could start with that and the gate generator since it generate from 0 to 100% you can use it at the T point (set) and have another frequency generator having 50% duty cycle at the clock point... R
You could use the same configuration of the timer used for the gate generator since it generates 50% duty pulses too...
for example..
The pll is should be useful since it can follow frequency changes
Thanks god bless you too
