555

Pin 4 is usually held high. Are you reseting the thing with pulses on pin 4 - or was that a typo?

Ed

Bascially as John said.

If you go from a low to high transition on the reset pin, the output will go high straight away. Has nothing to do with any duty cycle you have set up.

Well, it will have a marginal delay, which will be shown in the data sheets.

Don...

Pin 4 is the "reset," it is held high by being hard wired to Vcc for astable operation, so this must be a trick question.

You should google for this real basic stuff before posting.

That is what I was thinking.

Two 555s with pin 3 of the first connecting to pin 4 of the second.

The first has a lower frequency that the second. The result should be a short repeating series of pulses. Each series is separated by a distinct pause.

I am sure that there are other ways of achieving this.

- or was that a typo?

No trick. See my reply to an earlier post.

Thank you for your no nonsense answer.

Oh. Usually my mind reading ability is much better. Sorry.

^^^^ Aarghhh!!! .............HC00

JF

Accepted. None of us can get through life without the occasional cockup.