555
| Ground | 1 | 8 | V+ |
| Trigger | 2 | 7 | Discharge |
| Output | 3 | 6 | Threshold |
| Reset | 4 | 5 | CV |
The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation and oscillator applications. The part is still in widespread use, thanks to its ease of use, low price and good stability. As of 2003, it is estimated that 1 billion units are manufactured every year.
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