how to produce this waveform?

[jerone]

what to use to produce this waveform?

**broken link removed**

 

[Papabravo]

Invert the trigger input.

 

[ericgibbs]

what to use to produce this waveform?

You could use a HEF4538 and trigger on the high going edge.

 

[crutschow]

You can invert the trigger.

 

[jerone]

thanks.

okey,ill try.inverting the trigger input might work.

 

[Wond3rboy]

how will inverting the trigger help when the monostable vibrator responds to a low pulse?just asking?i mean the second figure calls for the vibrator to respond in the +ve edge.

 

[crutschow]

how will inverting the trigger help when the monostable vibrator responds to a low pulse?just asking?i mean the second figure calls for the vibrator to respond in the +ve edge.

The monostable responds to the falling (leading) edge of the trigger. He wants it to respond the rising (trailing) edge. If you invert the pulse, the monostable should respond to the falling (now trailing) edge of the trigger as desired.

Of course that won't work if the trigger is level sensitive and not edge sensitive.