I was quite stumped when I read here on LFF that old Calumet shutter testers are sold for $200-$300.
Given the way the economy is going, perhaps a DIY way would be acceptable for some of you.
So, I've put up a Web page describing a new and improved version of the sound card shutter tester that a friend of mine has made after I've shown him my old version.
The new one is improved: does not need batteries, has its own light source, and provides more precise measurements. I've also prepared a small Excel file with some formulas, where you can enter the measured duration of the "sound", and the actual speed is shown, together with the deviation from the marked speed (in %).
The gadget looks rather ugly, but does its job. Given that the alternative costs at least $200, this one could be interesting
You need a computer with sound card and a microphone input, sound recording software ("Audacity" is freeware), and that's all.
The page explains it all.
The link: here.
Denis
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