Re: Simulating SPST and SPDT switches?

Terry Pinnell <terrypinDELETE@xxxxxxxxxxxxxxxxxxx> wrote:

>I've spent a few hours over the last couple of days trying to design a
>realistic and easy-to-handle simulation for break-before-make toggle
>switches. But I imagine this is re-inventing the wheel, as there must
>be well-established techniques. I'm using Circuitmaker, but I assume
>the principles must be similar in other programs.
>
>My approach so far (to the more complex case of a SPDT switch) has
>been to use two VCSs, a triangle wave input (inverted before applying
>to the 2nd VCS), and altering the respective VCS's Threshold values to
>get the 'break-before-make' delay. But I expect I'm making heavy
>weather of it, and would be grateful for shared techniques please.

As I suspected, once I started thinking straight, this turned out to
be pretty simple. For a SPDT, with about 40 ms between break and make,
I'm using this arrangement:
http://www.terrypin.dial.pipex.com/Images/SPDT-Sim.gif

Anyone have any suggested alternatives please?

--
Terry Pinnell
Hobbyist, West Sussex, UK
.