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Lets create a replacement for the HP5508A interferometer display.
Helium-Neon Laser based interferometers are fun to play with, and the appropriate lasers come up relatively cheaply on ebay from time to time. However, the necessary display is quite a rare find, and when you do find it, it is pricey.
So I wanted to make a microcontroller based replacement. And here you can find a list of the pages related to this effort:
HP5508A interferometer replacement hardware 2.0! - Heterodyne
HP5508A interferometer replacement hardware 2.0 - Heterodyne Interpolation
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