i want to use LDR as light detector with a transistor without using relay. my requirement is to get 5 v in day time and 0 volt in dark. that is i neet 1 and 0 state. what should i do?????
What circuit?Bad circuit, transistor turns on slowly + heats up.
The one with a transistor. With the assitance of google it is not hard to find temp. controllers for fans or brighness evalution circuits based on OpAmp.What circuit?
Ok, so you have a large resistance variation to work with. So you would like a Logic output, presumably with a bistable circuit which snaps from one state to the other.In room light resistance is 7.7kohm
and in dark resistance is 164kohm
yes the non-inverting comperator is shown.Here is a link to suitable emitter-coupled Schmitt Trigger based on transistors.
Do you have two of them?i have 2N2222 transistor