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Two monoshot multivibrators, one positive edge triggered 
and another negative edge triggered 
are connected as shown in figure
The monoshots 
and 
when triggered produce pulse of width 
and 
respectively. Where 
. The steady state output voltage 
of the circuit is
When M1 is on, it produces a pulse of width 
, during that time M2 is off & the output 
is ‘0’. As M1 output goes to zero, M2 is triggered & produces a pulse of width 
. When M2 turns OFF there is negative edge on Q2 and positive edge on 
. So, M1 is triggered again and again produces a pulse of width T1.
Output will be ON for time & OFF for time as shown below,
