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I think, that the best way is use 30mA continuous current from current source built with LM317 for example. You can use resistor and voltage source, but you have to remeber that current changes with LED's temperature in this case.
May be this link will be helpful, but i general I think that better way is use CF or SD card, because floppy will dissapeard in the future :)
h**p://jeanfrancoisdelnero.free.fr/gbdk/index.html
Re: square wave
Yes, LC circuit can resonate with a square wave voltage source, because square wave is a sum of sinusoid's (Fourier approximation). LC circuit resonate on the basic frequency (square wave frequency) and the other waves with higher frequency are suppress, so we can observe only...
Re: PWM
Fixed off time is useful in some cases, but you can have fixed frequency and variable pulse width or fixed pulse width and variable frequency. Fixed off time and fixed frequency is a static wave, you can generate it, but it's not PWM signal, because of fixed off time (you can't modulate...
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