Discussion in 'Homework Help' started by gvi70000, Oct 13, 2009.

  1. gvi70000

    Thread Starter Active Member

    Oct 4, 2009
    In the sound circuit i use Q1 as a preamp and lmv721 as comparator. To adjust the sensitivity i use R2 (475KOhn is the measured value).
    In the light sensor R1 adjust the sensitivity. you think that these circuits will do the job?
  2. Thav


    Oct 13, 2009
    I'm not sure what the "job" is. Could you elaborate on the purpose of the circuit?

    As a style note it will usually be easier for someone to read your schematic if your ground symbols point down. When your decoupling caps and batteries are upside down it just makes someone have to think, if only for a moment, about something that isn't important to the operation of your circuit.
  3. gvi70000

    Thread Starter Active Member

    Oct 4, 2009
    I want to build a camera shutter trigger with a light and sound sensor.

    When the microphone detects a sound the shutter is on. I need to adjust the sensitivity to not have false triggers. To see the threshold that triggers my camera i need the led

    For the light sensor i need two modes:
    1. Trigger at lighting or other flashes (sudden light increase)
    2. To trigger when a beam of light that falls on the photo diode is interrupted (to get nice pictures of water drops).
    and also sensitivity adjustment.

    In sound circuit Vsin represent the microphone and in the light one represents the light.