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Acct 555 Unit 5

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555 is a very commonly used IC for generating accurate timing pulses. It is an 8 pin timer IC and has mainly two nodes of operation: mono-stable and a-stable. In external resistor and capacitor whereas in a-stable mode the frequency is controlled by two external resistors and a capacitor. It has a frequency of about 100 Hz [1]. The CD4033 has provisions for automatic blanking of the non-significant zeros in an easily readable display consistent with normal writing practice [2]. The 7- segment display outputs go high on selection in the CD4033.

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