[Discussion] fluorescent tube

[Robert Carter]

I think using a low voltage transformer might just do the trick thanks!

On 20/09/2011, at 9:08 AM, Richard wrote:

> On 9/20/2011 8:44 AM, Robert Carter wrote:
>> Correct me if i'm wrong: The ballast in the fluro light fitting generates a sine wave power supply. If I was to connect in parallel a speaker with a current limiting resistor, that speaker would hum at the frequency of the AC supply. Right?
>> 
> 
> Old ones were just a choke, so they just provided some impedance to 
> limit the current thru the tube to what it could take. No "generation" 
> of a sinewave involved, just the mains one passing thru. They will put 
> out a nasty kick of voltage on starting which would probably kill 
> anything you put in parallel.
> 
> Current gen ballasts are all electronic and output a high frequancy 
> which will be above audable range.
> 
> If you want to just get mains hum then I would be getting an old style 
> AC wall wart adapter of 6v or so and putting that into the speaker, or 
> perhaps an old style halogen light transformer (not the switchmode ones 
> you get now)  If you put it on a dimmer you should be able to get some 
> interesting harmonics going on as well.
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