hey ejaf..
here's a link to an aussie supplier,
Jaycar
I also tried using a 555 initialy, in astable mode as an oscillator. I tried using a pot on that to vary the duty cylce of the pulse, but I found that I could never achieve greater than %50 duty cylce on the square wave. ( The duty cylce equation backs this up, see page 8 of the
555 timer datasheet )
This is why i switched to a PWM circuit.
Cheers,
ph2t.