Dane.Kouttron
[5.14.17] [SuperQuick] Baush&Lomb Microscope Light Upgrade
What? |
EBAY Ring Light |
Printed Adapter Bit | Downloads | Conclusion | Image Directory |
Quick Intro to the Bausch & Lomb 'Stereo Zoom 7' |
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The Baush & Lomb series of 'big angry 1980's microscope on an offset heavy arm' are really quite excellent for SMD component install and soldering. They also commonly appear in laboratory cleanouts and industrial auctions. | ||
This one in particular came from a lab cleanout, and has seen, some use. It was missing the eyepieces, but fortunatley, they are standard. The ever-excellent peter crufted some from the ether and lo, they work great. These use 23mm optic mounts, which are fairly common [amazon] [ebay]. There's an excellent teardown thread [here] | ||
A copy of the series manual is available locally here [link]. This convienently provides some excellent imagery into the innards of the microscope assembly. |
Ebay Ring Light and adapter |
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There are a number of ring light adapters floating about the multiverse, I opted for this [link] one | ||
The innards of this particular led ring light are better than I expected. Normally ~5w mains connected leds use a capacitive dropper based supply [link]. While capacitive droppers do work, however, they are non-isolated and the giant-film-cap to drive the leds can be a bit bulky. I think, as this is marketed as a 110/220 mains adaptable supply, they opted for the tiny-switcher approach. Capacitive droppers also exhibit the 'quite blinky' issues | ||
Yowza, its not just a capacitive dropper. The IC that runs the led driver is a dk106, [local link]. Its actually rated for 85-265vac operation, which explains the '110/220' capability. It runs from rectified mains and twiddles a transformer, using an optocopuler as voltage feedback. | ||
Its actually pretty bright too. The adjust pot is smooth and there is no characteristic 'low duty cycle flicker' which occurs on a number of dimmable things where their internal switching frequency, plus low adjust setpoint result in an increasingly viewable flicker. |
Solidpart files |
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Here are the cad files for this printed part. I used an UP! Mini to print the part. Download below! [Solidworks 2014] [stl] [igs] |
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(There's
other photos in the photo gallery)
Concluding Remarks:- 3d printers and cad make engineering great again
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Dane.Kouttron
Rensselaer Polytechnic Institute
Electrical & Electrical Power
631.978.1650