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Gallery, Projects and General => Neat Stuff => Topic started by: tom osselton on August 20, 2013, 03:09:04 PM

Title: Igor throw the switch!!!
Post by: tom osselton on August 20, 2013, 03:09:04 PM

Found this interesting  a pcb variable speed control

   

Title: Re: Igor throw the switch!!!
Post by: Bluechip on August 20, 2013, 05:21:05 PM

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 (http://en.wikipedia.org/wiki/Liquid_rheostat)
 
Me and a bloke called Faraday used 'em ....  :scratch:   :scratch:
 
Dave BC

Title: Re: Igor throw the switch!!!
Post by: 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!!

Title: Re: Igor throw the switch!!!
Post by: PekkaNF on August 21, 2013, 03:16:06 AM

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!!

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

PekkaNF

Title: Re: Igor throw the switch!!!
Post by: awemawson on August 21, 2013, 03:41:03 AM

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

Title: Re: Igor throw the switch!!!
Post by: Bluechip on August 21, 2013, 03:43:40 AM

I noticed that too, Pekka, but was too polite to mention it  :lol:   :lol:
 
I was on an electronics forum the other day, someone had a Magnetic Pick-up  that apparently gave 20MV output .....
 
WOW  :zap:   no need to bother with amplifiers then ????
 
Dave
 
 
 
 

Title: Re: Igor throw the switch!!!
Post by: tom osselton on August 21, 2013, 10:49:01 AM

I just thought it was kind of neat,  I mean hell here I am using a dimmer switch!!  :doh: I'm  not too knowlegable about electronics basic stuff I'm ok on but more complex I just scratch my head and say hmmm.

Title: Re: Igor throw the switch!!!
Post by: angus on August 21, 2013, 12:07:02 PM

ooppsss tooo many beers !!


4 MW :doh: :doh: :doh:

Title: Re: Igor throw the switch!!!
Post by: DMIOM on August 21, 2013, 01:38:33 PM

Quote from: angus on August 21, 2013, 12:07:02 PM

ooppsss tooo many beers !!
......

Wouldn't like to think of wasting beer as the load cell liquid!   :beer:  :zap:

Title: Re: Igor throw the switch!!!
Post by: NeoTech on August 21, 2013, 01:45:38 PM

that looks scary as hell.. why would one do that.   :bugeye: