[simpits-tech] RC Timer delay

[Heidner, Troy W]

Stig,

Yeah, that should work.  Especially if you try to keep your R1 value small
as I mentioned in my second post.

Troy

> -----Original Message-----
> From: Stig Joergensen [mailto:stig.joergensen@clearsky.dk]
> Sent: Thursday, February 21, 2002 5:02 PM
> To: simpits-tech@simpits.org
> Subject: RE: [simpits-tech] RC Timer delay
> 
> 
> Thanks Troy
> 
> Its for use on a parallel device, so the strobe should be TTL, and it
> should be used to drive the ACk low, to make the PC think the data was
> "put" ok. But i realize what you are saying about the five times...
> 
> So if I extend the circut with a Zener of 3.2 (i think) and a new
> Resistor(r2) of aprox. 90ohm
> shouldn't I be in the clear?
> 
>  strobe----|
>          __|__
>           cap
>          _____
>            |      ___ 
>            |-----|r2 |------- ack
>            |            |
>           |r|           |
>           |1|          _|_
>           |_|          /_\
>            |            |
>  gnd-------|------------|
> 
> 
> > -----Original Message-----
> > From: Heidner, Troy W [mailto:theidner@ku.edu]
> > Sent: 21. februar 2002 23:45
> > To: 'simpits-tech@simpits.org'
> > Subject: RE: [simpits-tech] RC Timer delay
> > 
> > 
> > Stig,
> > 
> > You've got the time constant formula correct.  The units for 
> > the RC time
> > constant are seconds.  i.e. if you used a 1 microfarad 
> > capacitor and a 1
> > megaohm resistor, the value for one time constant would be:
> > 0.000001 F  x  1,000,000 ohm =  1 second.
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