8mm Forum: Projector shutter counter

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Topic: Projector shutter counter

John Last
Expert Film Handler

Posts: 104
From: Codsall, UK
Registered: Dec 2012

posted November 23, 2014 04:37 PM

I have just made a device for reading the shutter speed of my projectors. You will need a digital frequency meter first of all. Then you will need a LDR (light dependant resistor), a 470K resistance, a 9 volt battery and a couple of terminals to connect to the meter. Any one interested, I'll send you the circuit diagram

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted November 23, 2014 08:43 PM

I did something like this a few years ago except I put the meter where you are putting the 470K resistor. The only fly in the ointment is only my meter at work can measure frequency and I generally prefer that stays at the job!

I've been messing around with designing an analog circuit to spit out a DC voltage based on frame rate (2.4 VDC @ 24 FPS) so I can use my own DVM as a display.

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All I ask is a wide screen and a projector to light her by...

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