IR Emitter Project Newb At The Wheel!

Discussion in 'The Projects Forum' started by Crash1976, Jun 10, 2009.

  1. Crash1976

    Thread Starter New Member

    Jun 10, 2009
    Ok so I'm working on this paintball gun that has PDS (paintball detection system)installed. It's an older system and It utilizes an IR emitter that is "Always on" and a reciver that when the IR light is blocked closes the circuit and allows the solenoid to "fire". Pretty simple so far.

    Keep in mind I'm a Newb and even reading my DMM can be a challenge.

    I'm using an Optek OP165A emitter and an OP505A phototransistor.

    The voltage I measure across the emitter terminals is 1v(+/-.2v)
    My curent is what is bothering me it shows .580mA(+/-.02mA). This is way to low to operate the emitter, as I get no light showing up on camera.

    Is there any way to step up the curent or should I be looking for something causing current loss further up the chain?
  2. Crash1976

    Thread Starter New Member

    Jun 10, 2009
    I just need to figure out how to get the curent I need and how to know if it is due to a problem elswhere in the circuit.
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    The IR diode probably has a forward drop of 1.5 volts. You do not have enough voltage present to bias it into conduction. You might check your battery.
    Last edited: Jun 11, 2009