I have put together a circuit from here:
and this is the schematic:
I have the led, ldr and the 100k pot part of the circuit working fine, but the buzzer from the 555ic does not work or sound as it is supposed to do. (the buzzer is new and and has worked on another project)
I am using a BC327 pnp transistor as I don't have a BC557 transistor
The author clearly has it working fine, but I cannot get it fully working.
Hopefully as per the schematic, I have a wire from pin 2 on 555ic to the emitter of the BC327, and also a wire from pin 3 of the 555ic to the positive side of the buzzer.
Now, the strange thing is after removing the said wire from the BC327 emitter, the buzzer does work, albeit when the ldr has not been covered.This seems to be due to the capacitor across pins 1 and 2 of the555ic.