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Op-Amp Monostable Multivibrator |
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Figure 1.
Op-Amp Monostable Multivibrator Circuit Diagram
This is a
monostable multivibrator circuit that employs a single op amp. The main component of this
circuit is the 741, a general-purpose operational amplifier. A
monostable multivibrator is a timing circuit that changes state
once triggered, but returns to its original state after a certain time
delay. It got its name from the fact that only one of its output
states is stable. It is also known as a 'one-shot'.
A negative
trigger pulse at the input forces the output of the op amp to logic
'high'. This charges up C2 which keeps the non-inverting input of
the op amp temporarily higher than the inverting input, maintaining the
output high for a certain period of time. Eventually C2 discharges
to ground and the op amp output swings back to logic 'low'. The
duration of the pulse is defined by R2 and C2. The 'one-shot' has
several applications, which include dividing the frequency of the input
signal and converting an irregular input pulse to a uniform output
pulse.
See
also: Operational Amplifier
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