Hi. I am busy design a circiut, on the switch it need to be pressed once but it have to give a pulse of 12v three (3) times within one (1) second out. Can anyone help me, I tried everything.

 

You want 3 pulses within 1 second. What is the width of these pulses?

 

You could do that with a 555 connected as an astable oscillator to generate three pulses per second, and a counter, such as the CD4017, to inhibit the astable after three pulses.

 

praondevou:

the width must be between 20 and 30 miliseconds each