well, nvr mind.... i got a bc548, but couldnt make it work..... the ground-shutter connection always remains closed whenever the circuit is switched on. i tried 100k, 10k, and 47k with transistor base, same result
the red LED blinks with the time interval and the green LED glows continuously.
cannot figure out anything....
the current at base of transistor does vary, but only by about 5 uA. (maybe wrong since my multimeter has a low refresh rate). all i know is that ground-shutter contacts remain closed forever