New! Dark mode!

Browsing Pinside at night? Getting tired of all the white? Switch to dark mode using the button in the top right (or CTRL-B)!

(Topic ID: 277394)

Opto Board Recievers Voltage


By Underwood5853

81 days ago



Topic Stats

  • 7 posts
  • 5 Pinsiders participating
  • Latest reply 78 days ago by jabdoa
  • Topic is favorited by 2 Pinsiders

You

Linked Games

No games have been linked to this topic.

    You're currently viewing posts by Pinsider dumbass.
    Click here to go back to viewing the entire thread.

    #5 81 days ago
    Quoted from Underwood5853:

    The ball trough uses opto switches and the transmitters work fine but the receivers don't work.

    How do you know if the transmitters are working when the receivers are not working? They are used as a pair. The only way I can see is if the output of the transmitter is visible to a digital camera that does not have an infrared filter. If you provide circuit diagrams this could be more easily verified.

    If you use an appropriate current limiting resistor you should not damage the transmitter. If you haven't used a current limiting resistor and have applied power to the transmitter you may have damaged it. Having said that I'm going to assume you have a valid transmitter side circuit and would agree with you that the transmitter is probably working fine. The transmitter side circuit is somewhat simple. Note that Williams drove their transmitters around 40mA so I think 75mA is quite high.

    I'm going to assume that you don't have a receiver circuit as the reason you asked the question.The 1.7V specified as the forward voltage is for the transmitter not the receiver. The receiver is a photo-transistor not a light emitting diode. You need to design a receiver circuit. It will need to detect the binary state of open or closed. When the light from the transmitter falls onto the receiver it should output voltage equal to the supply voltage (the actual output voltage depends on the amount of current flowing through the receiver and the amount of current depends on the amount of light and the amount of light depends on the amount output by the transmitter). When the light is interrupted the voltage should be close to zero but there is still current flowing. This is the "dark current" as specified in the data sheet.

    It's likely the transmitter is QED123 and the receiver is QSD124. You can find those data sheets by searching the web or visiting a general electronics merchant site.

    Promoted items from the Pinside Marketplace
    $ 11.95
    From: $ 40.00
    Lighting - Interactive
    Professor Pinball
    $ 69.99
    Playfield - Toys/Add-ons
    Lighted Pinball Mods
    $ 19.95
    $ 9.00
    Cabinet Parts
    Third Coast Pinball
    $ 96.77
    Playfield - Toys/Add-ons
    Pinball-Mods.com
    $ 229.00
    Lighting - Led
    PinballBulbs
    $ 7.00
    Playfield - Toys/Add-ons
    3D Tech. Pinball Parts
    $ 175.00
    Lighting - Interactive
    Professor Pinball
    $ 29.00
    Gameroom - Decorations
    Pinball Photos LLC
    $ 69.99
    Playfield - Toys/Add-ons
    Lighted Pinball Mods
    $ 15.00
    Playfield - Decals
    Iron Monger Decal Out of stock
    Flashinstinct
    $ 75.00
    Playfield - Toys/Add-ons
    DBC Pinball
    $ 64.99
    Lighting - Led
    Comet Pinball
    $ 269.00
    Cabinet - Other
    PinGraffix Pinside Shop
    $ 86.95
    Cabinet - Shooter Rods
    Super Skill Shot Shop
    $ 7.50
    $ 128.00
    Playfield - Other
    ModFather Pinball Mods
    $ 40.00
    Gameroom - Decorations
    Arcade Arts
    $ 39.00
    Gameroom - Decorations
    Concealed Art
    From: $ 33.00
    Gameroom - Decorations
    Rocket City Pinball
    $ 149.00
    Playfield - Toys/Add-ons
    Sparky Pinball
    $ 5.49
    Electronics
    Yorktown Arcade Supply
    $ 36.99
    Eproms
    Matt's Basement Arcade
    From: $ 9.99
    Eproms
    Matt's Basement Arcade
    $ 54.99
    Cabinet - Shooter Rods
    Lighted Pinball Mods
    $ 8,999.99
    Pinball Machine
    Music City Pinball
    $ 399.95
    Lighting - Led
    Pin Stadium Pinball Mods
    $ 79.99
    Cabinet - Armor And Blades
    PinGraffix Pinside Shop
    $ 9,500.00
    Pinball Machine
    Classic Game Rooms

    You're currently viewing posts by Pinsider dumbass.
    Click here to go back to viewing the entire thread.

    Hey there! Got a moment?

    Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside