Fluidic amplifier/hydraulic transistor

by mymakerblog, published

Fluidic amplifier/hydraulic transistor by mymakerblog May 28, 2013


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5814Views 521Downloads Found in Mechanical Toys


It's a fluidic amplifier. A small stream of fluid deflects a large stream, in effect, amplifying a pneumatic signal. If you want more details, I wrote about it in my blog:


You can test it by holding the pieces together and blowing simultaneiously into the power port and one of the control ports. It's pretty freakin amazing that it works. :)

I should also mention that this has already been patentedin 1974:



Print two of these out and them stick them together. To test them, you only need to hold them together with your hands and blow through the power port and one of the output ports. I just tested it and between 70-90% of the air went through the right output port. Considering that I was holding them together with my hands and using my mouth, that's pretty freakin' good.

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Thanks for uploading this thing!
Very interesting - super simple - I think I'll need to try this out.

I came here from this old sci.nanotech post regarding a "macro-scale machining self-replicator"

I guess you implemented the design that is currently (2017-04-09)
illustrated on the Wikipedia page about fluidics:
This one: https://www.google.com/patents/US4000757 (From U.S. Patent #4,000,757)
The patent you've linked in the description shows some other slightly different designs.

I think a good fit to this design would be 3D printed bellows out of some TPU plastics (like e.g. Filaflex)
Gonna think about how gas / liquid flow rate and pressure requirements scale with growing systems size.

Also I think printing the device upright as one single piece would be preferable to reduce assembly labor and complexity and avoid alignment requirements. The narrow "roofs" of the channels then need to be made V-shaped though
to prevent (short length) bridging that could potentially introduce air-gaps.

Maybe the IO channels of the components can be made self centering and can be pressed together sufficiently airtight with tension:
Something along these lines: http://reprap.org/wiki/ReChain_Frame_System

this is REALLY cool work. very helpful for my designing purposes. thank you

I saw a fluidic amplifier on TV decades ago, and have always wondered what it was - couldn't figure it out via Wikipedia, either, because I never knew what it was called until today. Thank you!