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further electronics: 15:58 (2006.09.11:2 tech_notes#260 electro#1)

flip-flop:

flip-flop as (bistable, in the case of counters, registers and memory) multivibrator

http://www.eelab.usyd.edu.au/digital_tutorial/part2/flip-flop01.html

inductor:

changing current in an inductor produces an EMF in the inductor which opposes the current change...

-> reactance (ohms) whuch is the ac equivalent of resistance and in case of inductor is effected by frequency (high frequency high reactance)