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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,
