Thursday, December 2, 2010

Basic Monostable Multivibrator based IC 555

The following diagram is the circuit diagram of the very basic monostable multivibrator which built based on timer IC 555.

Basic Monostable Multivibrator based IC 555 circuit



Parts list:
R1 = see notes
C1 = see notes
C2 = 10nF
IC1 = LM555

Notes:
  • R1 and C1 determine length of output pulse where t=R1xC1 and R1 is in ohms and C1 is in farads.
  • Pin 4 is the RESET. Leave it connected to power supply (+V) during normal operation. Bring pin 4 AND pin 2 low at the same time to reset timing cycle.
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