Since it's your intention to change it out you obviously think you can
get at it to remove it. I would guess that the part is marked with its
resistance and maximum power level in watts so do as much disassembly as
required to check the specs on the case. Other considerations are
physical dimensions. Will the new part fit back in the same hole, will
the mounting nut hold it in place and is the shaft the right size and
length for the adjustment knob. On the page you showed there were pots
marked linear and audio. Audio pots are non-linear to more closely
match our hearing response. You'll want a linear pot for the lamp.
Chuck Norcutt
Charles Geilfuss wrote:
> Frank,
> Thanks for your help. I'm trying to replace the built-in potentiometer
> with one that can be wired into the microscope body in a fashion similar to
> the original. My microscope table is small so I'm trying to avoid the
> separate control box.
> At this link are multiple potentiometers but I don't know haw to determine
> with would be appropriate:
>
>
> http://www.radioshack.com/search/index.jsp?kwCatId=&kw=potentiometer&origkw=potentiometer&sr=1
>
> Charlie
>
> On Wed, Nov 19, 2008 at 2:44 PM, Frank van Lindert <Frank@xxxxxxxxxxxxx>wrote:
>
>> Charlie,
>>
>> I take it that your light is 6 volt 20 watt?
>>
>> In that case you cold replace the regulator by any other brand 6 volt
>> one. Olympus made them too, for use with their microscopes and with
>> their OM-LSD lamps...
>> http://olympus.dementia.org/eSIF/om-sif/macrophotogroup/lsd.htm
>>
>> Of course you should wire the regulator (kind of transformer) directly
>> to the light inside your microscope or lighthouse.
>>
>> If you can find any halogen lamp regulators they will do a nice job
>> to, as long as they are intended for 6 volt (most are for 12 volt!).
>> One I found and which can be ordered for 6 volt is here:
>> http://www.geneq.com/catalog/en/dimmer_c_100w.htm
>>
>> I remember that in the early days of household halogen lighting there
>> were some 6 volt dimmers around too. Nowadays everything is for 12
>> volt or for 110/220 volt directly from the wall outlet. Maybe you can
>> still find some of the old ones?
>>
>> Good luck iwhen searching,
>>
>> Frank van Lindert
>> Utrecht NL.
>>
>> Wed, 19 Nov 2008 13:13:02 -0500, "Charles Geilfuss"
>> <charles.geilfuss@xxxxxxxxx> wrote:
>>
>>> Greetings All,
>>> I know there are a few people on the List knowledgable about all things
>>> electrical, so I am hoping I can get some advice. I have a 15 year old
>> Leitz
>>> Laborlux S microscope that I use daily. The rheostat (potentiometer)
>>> controling the light source is going bad. The light will flicker and does
>>> not adjust smothly in some of its range. Visual inspection of the part
>> shows
>>> wear on the surface of the coil. Cleaning with De-Oxit did not help. I'm
>>> planning to replace the part but Leitz no longer carries parts for this
>>> model and my efforts to find an original part have been fruitless. There
>> are
>>> plenty of potentiometers available form electrical parts companies, but
>> how
>>> do I determine what specifications I need. The scope uses a 6 Watt, 20
>> Volt
>>> bulb and of course plugs into a 110 Volt wall outlet. Any advice?
>>>
>>> Thanks,
>>> Charlie
>> --
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