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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Scope scale illuminator bulbs
Scale illumination lamps blown. Anyone ever tried droppered blue or white
LEDs for such purposes. Would probably require a reflector on the LED lighting axis to throw light off radially. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#3
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Scope scale illuminator bulbs
In article ,
N Cook wrote: Scale illumination lamps blown. Anyone ever tried droppered blue or white LEDs for such purposes. Would probably require a reflector on the LED lighting axis to throw light off radially. Yes - but you have both the colour problem (nasty hues) and the fact they tend to be a near point source as opposed to the tubular tungsten ones normally used. I got fed up of constantly replacing those on a series of PPMs and fitted small fluorescents. Of course this wouldn't be practical on most domestic meters. -- *If you must choose between two evils, pick the one you've never tried before Dave Plowman London SW To e-mail, change noise into sound. |
#4
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Scope scale illuminator bulbs
In article , "N Cook" wrote:
Scale illumination lamps blown. Anyone ever tried droppered blue or white LEDs for such purposes. Would probably require a reflector on the LED lighting axis to throw light off radially. How about red or orange or green, yellow ? |
#5
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Scope scale illuminator bulbs
"N Cook" wrote in message ... Scale illumination lamps blown. Anyone ever tried droppered blue or white LEDs for such purposes. Would probably require a reflector on the LED lighting axis to throw light off radially. An idea from IRLEDs which are available with wide angle radiation pattern - and have virtually flat lens instead of domed, you could flatten the end of some white LEDs (taking care not to cut too deep and take out the bond wire!) using a medium rough emery paper will leave a diffuser lens end. |
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