Subject:
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Re: Brickfest Pneumatic Master and new Pneumatic Gate Circuits
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 29 Aug 2005 17:14:17 GMT
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Viewed:
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5217 times
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In lugnet.technic, Mark Bellis wrote:
[SNIP]
> I've done some more study in order to investigate the 3-input gate, using the
> 4-switch module in multiple. This has shown me how the original 4-switch module
> from your sketch is an AND gate in its own right, as long as the differential
> pressure input is one input and the switch position is the other input. A
> reverser between stages can invert the differential pressure input, making
> endless possibilities for the logic function of the system, by allowing the
> output to be high in 1, 3, 5, or 7 of the eight combinations of three inputs.
The design process here was very simple:
Mark Tarrabain's wonderfully simple single switch AND gate does not produce
differential pressure. What do I have to add to this gate to get the other
phase of differential pressure?
The result is adding three switches.
I then asked myself "what does it take to make a single pressure OR gate?".
This took 3 switches. I enhanced to differntial pressure by adding one more
switch.
>
> Seeing the 4-switch module that way, and using it in multiple, makes for a gate
> without any extra propagation delays due to daisy-chaining. It's also more
> cost-effective, since only four switches are required. For a gate with two
> switch position inputs (rather than one switch position and one differential
> pressure), one of the switches driven by "A" can be trimmed from my diagram,
> making a 1+4++4 gate.
Yes, hooking Mark's single switch AND gates in series comprises a multi-input
AND gate. This is fabulous for making sequencers, because you minimize the time
and the part count.
>
> I still like the elegance of my 3+3 design, especially because it's symmetrical,
> but the most elegant solution is rarely the sleekest! In pneumatics there is
> more to be said for reducing parts count because the parts are so expensive.
> That's where 1+4++4 scores over 3+3++4.
>
> Overall this means that a set of combinational logic can be achieved with
> 4-switch AND modules and 4-switch reversers such that there is only a single
> propagation delay between states, which is good for machines whose timing is
> critical, such as your walkers.
Yes, it makes the slow walkers not as slow :^) But like I said, I stick to the
single switch AND gates for my walkers.
>
> Mark
Kevin
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