1 Hz Pulse Frequency Generator with 555
555fig2.gif
Add one resistor to give bipolar LM555 oscillator a 50:50 duty cycle - EDN
555 timer IC - Wikipedia
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555 Pulse Generator Module, How It Works : 8 Steps (with Pictures) - Instructables
555 Pulse Generator Module, How It Works : 8 Steps (with Pictures) - Instructables
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555 Pulse Generator with Adjustable Duty Cycle
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b>Electronics Components: 555 Timer Chip in Monostable (One-Shot) Mode</b> - dummies
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