/n will divide the input frequency / ratio
by factors of n
so it is easily possible just using a /n
a pll is a /n counter anyway as is a 4059 that can also be used as part of the pll
so your right and so am i
however passive elements arent needed to divide a 50 % duty to get to the needed mark space
and this output of a 4059 will be incredibly stable and full adjustable in 1 % or better steps
so it wont alter the frequency
just the mark to space
attached is the plans i found online for a water fuel based gas generator
i reworked it and used the circuit as an electroplating unit
it works very well at this job
indeed
youll see both methods are employed using a 555 timer to get both frequency and pwm outputs for a dual output waveform
the base freq runs low @ 100hz - 10 khz the upper pwm output is programmable fully using a 4059
although for your job you need
using the 555 on its own is enought
you can download the proteus vsm demo from there site
www.labcenter.co.uk
or it will also open in the lite version
from v6.6 sp3 onwards