Re: Help with a (simple - I think) circuit design

From: Randy Day (ruthal_at_sasktel.nex)
Date: 07/31/04 

Date: Sat, 31 Jul 2004 14:08:48 -0600

Visi Mail wrote:
> Thanks folks I think this is close to what I"m looking for, but I don't
> think it will work for my situation. If I understand the circuit drawn then
> either the output is grounded OR it has 5v on it? I don't think I can have
> any voltage on the output. I either need it grounded or effectively an open
> circuit.

How about running O1 and O2 thru some
open-collector gates (i.e. 7405)?
That gives you open or ground, but
you'll have to watch the current
limits...

or simply build your own:

       R | O1*
      ___ |/
O1 -|___|--|
            |>
              |
              |
             ===
             GND

       R | O2*
      ___ |/
O2 -|___|--|
            |>
              |
              |
             ===
             GND
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