need help understanding

Discussion in 'General Electronics Chat' started by trogr, Mar 7, 2012.

  1. trogr

    Thread Starter New Member

    Mar 7, 2012
    I have a ball sensor from a washing machine that I need to know if it works. It has 5 volt dc power in and .7 voltdc out in low state or 2.97vdc out in high state.
    This device is a simple opto emitter / detector with a ball in between. It detects motion when device is contacted by washer drum causing the ball to move allowing light to pass thru and it signals the computer.

    My Q is -- is 2.97 vdc a healthy high state on 5vdc rail, and is .7 vdc a good low.

    Also where can I find a data sheet on it, part no 6501FA2462C

    Thanks, Jeff
  2. #12


    Nov 30, 2010
    I'm thinking the high number (2.97) isn't good enough. It's not in the top 1/3rd of 5 volts.

    I got nothing with a datasheet search.
  3. Potato Pudding

    Well-Known Member

    Jun 11, 2010
    Technically 2.5 is a TTL logic high for most IC families. 5Volts makes it seem like TTL is in use.

    Line powered equipment like a washer doesn't need more energy efficient ICs. The circuitry is insignificant compared to the motors for power use. TTL would be valuable for its reliability and ease of repairs. The washer might also be old which makes TTL likely.