?????????(monostable multivibrator)???????(single shot)?????(one-shot)??,????????????,?????????????????????(???????)?

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• ?????????(monostable multivibrator)???????(single
  shot)?????(one-shot)??,????????????,?????????????
  ????????(???????)?

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• (?) TTL???????????????

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• (?) 555 IC ??????????

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• ??74121????????,????????????,???????????,??74121?
  ?????,??74121??????????????????
• (1)B??????A1?A2?????0,??B????????????????????????
  ?????,??????????(?1?/?)????,B?????????

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• (2)A1?A2??????B?A1?A2?????,?A1?A2?????,????????,A
  1?A2????????????
• 74121????????,????????,??????????????????,???????
  10?11???(CEXT),????????,????????11????????,??????

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• (1)???????????(2kO),??9????VCC?????8-11(a)?
• (2)????VCC??11???????,????REXT??1.4k?40k??,??????9
  ??????8-11(b)?

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• (?) 555 IC??????????

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• (?) 74121 IC??????????