[simpits-tech] RC Timer delay

[Stig Joergensen]

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.