[simpits-tech] RC Timer delay

[Heidner, Troy W]

Stig,

Oh yeah, and I forgot to say in my first post, I'm pretty sure the
percentage values that I gave you are accurate for the decay after two time
constants, but if you need more values I can get them for you.

Also, something to keep in mind when designing your circuit for a specific
time value...  Since you can pick any combination of resistor and capacitor
values to achieve any specific time value you might want, keep in mind that
it would be better to try to minimize the resistor value (in the circuit as
you have drawn it) as much as possible.  That way you will minimize the
effects of possible "loading" of your circuit by the output device as I
discussed earlier.

Troy

> -----Original Message-----
> From: Stig Joergensen [mailto:stig.joergensen@clearsky.dk]
> Sent: Thursday, February 21, 2002 3:54 PM
> To: simpits-tech@simpits.org
> Subject: [simpits-tech] RC Timer delay
> 
> 
> Hi Gang,
> 
> I need some help here. I need to calculate the time for RC (resistor
> -Capitor) delay circut. I know the formula is t = r*c, but 
> what are the
> units?
> 
> more specific, consider the following :
> 
> strobe----|
>         __|__
>          cap
>         _____
>           |
>           |----- out
>           |
>          | |
>          |r|
>          |_|
>           |
> gnd-------|
> 
> 
> when stobe goes high, out will go high almost at the same 
> time, but what
> should the walues (r and c) be for out to go low, say 5 ms 
> after strobe
> drops to low again?
> 
> /Stig
> 
> 
> 
> 
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