Is the output from a transistor sensor circuit analogue or digital? I know that you sometimes need a pull up or down resistor due to a very small current flowing through the transistor even when it should be off. However, in the circuit shown below for example, is the output signal analogue or digital. I think it should be analogue but the my notes on transistors are in the digital electronics section? http://www.kpsec.freeuk.com/images/tranldr2.gif [Broken] Thanks, A.