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[plucky]

and... How much is that in mA???

Do you mean that it doesn't consume much more than a transistor flip flop like in boss effects??

thanks

[gez]

and... How much is that in mA???

You decide!  Running from a 9V supply, deduct the threshold voltage of the LED (usually around the 2V mark - check your supplier's catalogue) and then divide this by the current you'd like to flow thru the LED to calculate the resistor needed.

If you use 'low-current' LEDs they usually spark up nicely with 2mA, though you can get away with less.  Try it, if it's not bright enough reduce the resistance...

[gez]

Do you mean that it doesn't consume much more than a transistor flip flop like in boss effects??

You bugger, you added that bit while I was typing!!  

Depends on how the flip-flop is done (IC or discrete?).  They're designed to use the least amount of current they can get away with, don't worry about it...

[gez]

deduct the threshold voltage of the LED (usually around the 2V mark - check your supplier's catalogue)

Look for the quoted 'VF' (usually a max figure).