@Z All of my PWM's vary both the pulse width, and the frequency. Having said that, the range is limited to design, knowing what frequency range you wish to work in, really helps. You can make them yourself, to more custom specs, of course. The 555 has it's limits though, and other methods (as discussed) are possible.
This is very close to what I use on a 12V HHO unit, both frequency and pulse width are controllable.
MXA067 Heavy Duty 30 AM PWM DC Control
This is very close to what I use on a 12V HHO unit, both frequency and pulse width are controllable.
MXA067 Heavy Duty 30 AM PWM DC Control
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