16th Jun 2019, 11:25 am | #101 | |
Octode
Join Date: Aug 2015
Location: Glasgow, UK.
Posts: 1,848
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Re: Turntable Stroboscope
Quote:
Looking back at my Post #60 above where I did a quick calculation that we want the LED to be on 1/16th of the time which is 3333μs divided by 16 (or multiplied by 0.0625) = 208.3125μs.
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16th Jun 2019, 10:23 pm | #102 |
Pentode
Join Date: Nov 2015
Location: Witney, Oxfordshire, UK.
Posts: 234
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Re: Turntable Stroboscope
Of course, flashes at 300hz are well above the eye's critical fusion frequency - that at which individual flashes cease to be distinguishable - which itself varies according to stimulus brightness and retinal location. (Thus, you'll have noticed that the flickering end
- 50hz at the ends - of an old fluorescent tube is much more apparent in peripheral vision than when looked at directly.) |