Re: Simle LED driver

On Aug 28, 11:42 pm, John Fields <jfie...@xxxxxxxxxxxxxxxxxxxxx>
wrote:
On Tue, 28 Aug 2007 00:14:57 -0700, Allen Bong

<allenbsf6...@xxxxxxxxx> wrote:
Thanks Ed, that seems to have solved all but one of my problems.
Based on circuit #1, do you think the 555 would kick start reliably
every time the power is switched ON?

---
With RESET- tied to Vcc, in order to do that you'll have to make
sure that the TRIGGER- input stays below 1/3Vcc until after the
RESET- input rises above 1.0V.

Additionally, the TRIGGER input must rise to >= 2/3Vcc before the
one-shot times out.

--
JF

Thanks very much John,

I'll recalculated the values of the components on pins 2, 6 and 7 to
make sure the interval of the TRIGGER is shorter than the minimum time
interval of the one-shot.

Allen


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