Gallery, Projects and General > Neat Stuff

Igor throw the switch!!!

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tom osselton:
Found this interesting  a pcb variable speed control

   

Bluechip:
Hi Tom

No idea why they used drain cleaner, salt water rheostats were one of the earliest forms of high power load resistors ..
 
Quite often used to test radio transmitters without using the aerial and splattering crap all over the aether.
 
http://en.wikipedia.org/wiki/Liquid_rheostat
 
Me and a bloke called Faraday used 'em ....  :scratch:   :scratch:
 
Dave BC

angus:
we used to use these at work, to load setm tubine generator sets up
had 4 or 5 tanks, no adustable plates, runnning about 4 mW of load

it steamed a bit!!

PekkaNF:

--- Quote from: angus on August 21, 2013, 01:50:00 AM ---we used to use these at work, to load setm tubine generator sets up
had 4 or 5 tanks, no adustable plates, runnning about 4 mW of load

it steamed a bit!!

--- End quote ---

4 mW i.e. milliwats is about right with lab experiment :)

PekkaNF

awemawson:
That was the standard way of dimming theatre lights in the 1920''s & 30's

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