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Thread: Concept for a Shutter Tester

  1. #31

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    Re: Concept for a Shutter Tester

    Quote Originally Posted by Drew Bedo View Post
    Thanks. Somehow I missed that. sounds really good.
    Drew, to make those sensors work we should illuminate the other side of the shutter, when shutter is open the light illuminates the photodiode (or phototransistor, or photoresistor) and then that sensor allows to pass an electrical current that goes to the audio input. The audio input does not know if the signal comes from a microphone or from a photodiode... so it records just the input voltage in the way it is intended, sadly audio inputs usually have a series capacitor to filter out DC, but anyway it will be possible to see shutter action.

    There was some confusion around that, as the device is connected to the audio input some sources were saying that it was a microphone, but at least the devices I see at ebay are all optical...

  2. #32

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    Re: Concept for a Shutter Tester

    I use for this a TORX type "optical fiber receiver", mine is an TORX193 I think (long time). These are the components used for digital audio TOSLINK. They are not that expensive and do not need more than 5V power, a small capacitor and a pull-up resistor (look the specific datasheet for your component). One advantage is that you can plug in an audio optical cable of say 1 meter. This gives you a sensitive surface of 2mm diameter that you can position where you want to measure (the loose end of the cable). Cut off the other connector with an x-acto knife if you need something really small. Just place a bright light on the other side of the shutter. I use an old FLuke scopemeter but anything measuring time is usable with some experimenting, you just get a positive pulse for the time the shutter is open.
    Expert in non-working solutions.

  3. #33
    Randy Moe's Avatar
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    Dec 2011
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    Re: Concept for a Shutter Tester

    Video of a Packard shutter when I was having hand strength problems squeezing the bulb...RA is real.
    TIN CAN COLLEGE

  4. #34
    Drew Bedo's Avatar
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    Re: Concept for a Shutter Tester

    Havoc: Thanks for that clarification. The last time I did anything like this I was 12-13 (1961) and it was a Heathkit buzzer kit we used to learn mores code in Boy Scouts.

    Seems like someone would have done up acommercially produced product before this. I know that there are dedicated shutter testers . . .but they see to be over $100 and on up. This type of item ought to be commercially available for less than $50 I would guess.
    Drew Bedo
    http://www.artsyhome.com/author/drew-bedo




    There are only three types of mounting flanges; too big, too small and wrong thread!

  5. #35

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    Anglesey, North Wales, UK
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    Re: Concept for a Shutter Tester

    Last edited by tonyowen; 4-Nov-2018 at 12:32. Reason: didn't link

  6. #36
    Randy Moe's Avatar
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    Re: Concept for a Shutter Tester

    Looks like somebody got smart and copied the the original product with improvements.

    I think the original inventor was Northern EU, this is Romanian.

    Probably no laws broken and I have Romanian friends.
    TIN CAN COLLEGE

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