Why this simple LED circuit using IRF540 not working ? Answered
This IRF 540 works well alone, and the it is very sensitive.
But to add an LDR, i tried it with a BC548 transistor, but it dint work, why ?
I am new to electronics, some one please help.
Instead of the 2.2k resistor, I am giving +ve output from an IR motion sensor.
If I connect a small LED to the motion sensor, that LED alone lights up, but the IRF 540 is not working based on the input from the motion sensor through BC 548 (also tried BC 547, 8050).
Connecting the motion sensor's +ve out put directly to the IRF 548 works, but the LED is not bright, voltage is too low.
Update: I solved it just by using few resistors.
Instead of using the 548 transistor, I used resistors.
The Motion sensor output's -ve all time, then the IRD540 turns off.
When there is motion detected , it outputs +ve and it just works!