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Registered Member #1837
Joined: Tue Dec 02 2008, 02:20PM
Location: NYC
Posts: 65
Hey everyone,
I picked up an antique microscope some time ago and I've been meaning to build some kind of light source for it. I've seen LED rings made for this sort of thing but I was hoping for something of adjustable intensity. (At 10x magnification you don't need nearly as much light as at 93x) One option is an LED array where the bulbs light up in stages (1/3 of the LED's, 2/3's then all), the other is maybe a small incandescent or halogen with an adjustable pot. Anyone have suggestions for what would work best? Battery power would be nice but so would a dimmer type setup with infinite range. I have seen flashlights that seem to have brightness adjustable LED's, but I have to assume they are just controlling on/off times.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Hello Dennis, I have half a dozen classic microscopes (Zeiss, Vickers metallurgical &c) ) etc the which I have converted to LED use with excllent effect.
But the cautions and precautions are these -
1) You can't just wind up the DV volts and expect a corresponding linear output luminance of the diode. Your diode OP must be regulated in terms of pulse-width modulation.it easily easily provided by the famous 555 and a linear amp. If the diode in ON half the time, and OFF the rest of the time then you half the effective optical power granted to to wom, by all floes from this.
In genral, micrscope illumination is not so much a matter of point-source illumination, but of even illumination across the viewing field.
LED's are extemely brilliant and focused upon your conrea will punch a dead hole traigth throught it.
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
perhaps use the micro SMD diodes from dead phones. I once bought £50 worth of these just for the diodes and displays.
these are ridiculously bright for their size... :)
i did have an idea, get a 4017 or PIC,and switch the LEDs around a circle at high speed. Reduces current draw without affecting brightness, and if you also add a polarising filter on each diode at slightly different angles you can scan the sample at multiple polarisation angles.
-A "Bother" said Pooh, as the warp core breached...
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Suggestions for a microscope light
