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- Path: sparky!uunet!news.uiowa.edu!ns-mx!pyrite.cs.uiowa.edu
- From: jones@pyrite.cs.uiowa.edu (Douglas W. Jones,201H MLH,3193350740,3193382879)
- Newsgroups: sci.engr.mech
- Subject: Re: Water Transistor?
- Message-ID: <13304@ns-mx.uiowa.edu>
- Date: 28 Jul 92 14:17:34 GMT
- References: <a4lm+9d.sspatter@netcom.com>
- Sender: news@ns-mx.uiowa.edu
- Lines: 69
-
- From article <a4lm+9d.sspatter@netcom.com>,
- by sspatter@netcom.com (Samuel Scott Patterson):
- >
- > ... Instead of electricity, it would use
- > running water. I've figured out how to do most of the
- > things needed, capacitators, resistors, trnasformers, diodes, etc,
- > but I don't have a clear idea of how to simulate transistors.
-
- I've done it. (Also note, ice is a protonic semiconductor, I've made an
- ice diode, but that's not a hydraulic solution to the problem you've
- stated.)
-
- Here's a diagram of a hydraulic inverter in its two states:
-
- High Pressure High Pressure
- Supply Supply
- | | | |
- \ / \ /
- Control ---\ | Control ---\__|
- Input ---/ | Input ---/ \
- / \ / \
- | | | |
- Controlled Controlled
- Output Output
-
- There are three nozzles, I used pyres tube, drawn to between 0.5mm and 1mm
- inside diameter and then broken in two to make matched pairs of nozzles.
- The high pressure supply nozzle and controlled output nozzles should be a
- matched pair with an inside diameter on the large size of the above range.
- The control nozzle can be on the small size of the range, but having all
- nozzles of equal size will work, although it limits fanout.
-
- I used a head of less than one meter for the high pressure supply. The
- flow from the nozzles should be a clean jet, with no cavitation or spray.
- The output nozzle must intercept this jet cleanly -- exact alignment is
- tricky and is best done with water flowing. I used ring stand hardware to
- hold my parts, but it would probably be better to use something like epoxy
- putty, aligning things when it's still soft, then letting it set.
-
- In the left diagram above, the control input is off -- it contains no
- water or the water in the tube is under no pressure. As a result, the
- water jet from the high pressure nozzle flows into the controlled output,
- maintaining the output at moderate pressure.
-
- In the right diagram above, the control input is at moderate pressure, so
- that a small jet comes out. This hits the jet from the high pressure
- supply and diverts it from the controlled output, so that has no pressure
- and any downstream control nozzles will not squirt.
-
- The following diagram shows a 2 input nor gate. I've built a flipflop
- from these:
-
- High Pressure
- Supply
- | |
- \ /
- ---\ |
- Control ---/ |
- Inputs ---\ |
- ---/ |
- / \
- | |
- Controlled
- Output
-
- I got the idea from an Amature Scientist column in Scientific American back
- in the 1960's.
- Doug Jones
- jones@cs.uiowa.edu
-