PURPOSE: To generate a pulse signal which is different in start time by operating one switch once by setting variation in the potential of a 2nd node only by a 2nd time constant circuit through the operation of a buffer means.

CONSTITUTION: When a switch SW is turned on for a specific time, TRs Q01 and Q02 are turned on at the same time to change capacitors C1 and C2. Consequently, the potentials at nodes A and B exceed the threshold voltages of the TRs Q1 and Q2, but the base current of the TR Q2 is eliminate by a TR Q3 and the TR Q2 is held off. When the SW is turned off, the C1 and C2 begin to be discharged and the potential at the node A decrease with the time constant determined by the C1 and resistance R1. The potential at the node B decreases with the time constant base upon the C2 and resistance R2 because the input impedance of a buffer amplifier A1 is large, thereby pulling down the base potential of the TR Q2. Therefore, the pulse signal which is different in start time can be generated by operating one switch once.