Author Topic: Igor throw the switch!!!  (Read 4564 times)

Offline tom osselton

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Igor throw the switch!!!
« on: August 20, 2013, 03:09:04 PM »
Found this interesting  a pcb variable speed control

   


« Last Edit: August 20, 2013, 06:48:01 PM by dsquire »

Offline Bluechip

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Re: Igor throw the switch!!!
« Reply #1 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
 
Me and a bloke called Faraday used 'em ....  :scratch:   :scratch:
 
Dave BC
I have a few modest talents. Knowing what I'm doing isn't one of them.

Offline angus

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Re: Igor throw the switch!!!
« Reply #2 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!!

Offline PekkaNF

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Re: Igor throw the switch!!!
« Reply #3 on: August 21, 2013, 03:16:06 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

Offline awemawson

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Re: Igor throw the switch!!!
« Reply #4 on: August 21, 2013, 03:41:03 AM »
That was the standard way of dimming theatre lights in the 1920''s & 30's
Andrew Mawson
East Sussex

Offline Bluechip

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Re: Igor throw the switch!!!
« Reply #5 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
 
 
 
 
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Offline tom osselton

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Re: Igor throw the switch!!!
« Reply #6 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.

Offline angus

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Re: Igor throw the switch!!!
« Reply #7 on: August 21, 2013, 12:07:02 PM »
ooppsss tooo many beers !!


4 MW :doh: :doh: :doh:

Offline DMIOM

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Re: Igor throw the switch!!!
« Reply #8 on: August 21, 2013, 01:38:33 PM »
ooppsss tooo many beers !!
......

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

Offline NeoTech

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Re: Igor throw the switch!!!
« Reply #9 on: August 21, 2013, 01:45:38 PM »
that looks scary as hell.. why would one do that.   :bugeye:
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