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The truth table of a monoshot shown in the figure is given in the table below:
Two monoshots, one positive edge triggered and other negative edge triggered, are connected as shown in the figure. The pulse widths of the two monoshot outputs, 
, and 
, are 
and 
, respectively.
The frequency and the duty cycle of the signal at Q1 will respectively be
In the first monoshot,
Y = 1, so it will be triggered at negative edge of X = Q2
In second monoshot,
X = 0, so it will be triggered at positive edge of Y = 
The waveforms for the outputs of two monoshots are shown below,
From the waveform, time period of Q1,
T = TON1 + TON2, f = 
Duty cycle, D = 