hello all. I'm new here. i got problem with my project.
this my circuit.. i run it using PROTEUS SOFTWARE but then there is no output at D3 & D4. but D2 is ON. i hv replace LDR with R3 bcoz there is no LDR component in Proteus.
as for the input, i put 5V. can anyone tell me wat is the problem.
and wat is the actual output (pulse/wave) at pin 7 LM358?
Of course there is no output because there is no input.
If your simulation program does not have an LDR then use an NPN transistor for R3 and feed it with a very low frequency signal.
thanks for the advice. it result an output. but, can u tell me how the output from the LDR which is in resistance will be input for the op-amp since op-amp only feed voltage as input?
Use the LDR as part of a voltage divider with a resistor in series with it. Then the resistance change of the LDR changes the current which changes the voltage across the LDR and across the resistor.