I need what he needs also, I think.
I'm looking to have a variable frequency square wave, pulsed on the negative side as the input.
the output frequency needs to match the input frequency, but vary the pulse width output in a linear fashion with the frequency input.
and have an adjustment knob that would set the pulse width for fine tuning, from zero pulse width at zero frequency to 100% pulse width at 5khz (preferable 5 knobs that would each target a set frequency range, yet all work together at the same time), all voltages need to operate from 10-15v and the output needs to be able to power up to 8 small 12v solenoids...
I'm willing to pay a tiny bit for a working diagram...