Using Monostable Trigger to Construct Pulse Delay Circuit

The figure below shows a pulse delay circuit. It consists of two monostable triggers D1 and D2, which can delay the pulse signal for a certain period of time. The pulse delay time is determined by the size of the external timing components R1 and C1 of D1, and the pulse width after delay is determined by the size of the external timing components R2 and C2 of D2.