1. October 12, 2012 at 9:04 pm

    Girish sharma

    is it 100k rehostate ..??

  2. August 22, 2013 at 9:57 pm


    I built a circuit just like this but I have the LDR and the resistor in the switched mine detects dark and turns on a light

  3. December 3, 2013 at 10:53 pm


    Put a resistor(330Ω…1kΩ) in series with that LED. Otherwise it will blow, and the transistor too.

  4. October 23, 2014 at 2:13 pm

    Amdani Wijaya

    ” If the input voltage is higher than the reference voltage, then the output is negative. If the input voltage is lower than the reference, then the output is positive. ”
    How much is the difference’s value that can be read as the difference between the voltage reference and input voltages, so the output voltage can result in positive or negative?
    Thank you!


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.