Re: coutdown 555 timer values?

On 25 Jul 2005 16:04:44 -0700, "Chris" <cfoley1064@xxxxxxxxx> wrote:

>Actually, one of the major problems here that nobody is talking about
>is the power supply. The 555 changes state on 1/3Vcc and 2/3Vcc. If
>the supply is unregulated or poorly regulated, the power supply sags
>are going to change things quite a bit, too.

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Not really, since the trigger and threshold volatges are derived
ratiometrically from Vcc through a three-resistor voltage divider.

--
John Fields
Professional Circuit Designer
.