NE555 Test
YOUR LINK HERE:
http://youtube.com/watch?v=MYKOV7bNht4
A simple 555 test in astable mode, with a diode in parallel with R2 for a duty cycle of 50%R1=22kR2=22kC=2.2uF-------------------R1=22kR2=22kC=100uF
555 Timer IC
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