IC 555 Timer Metal Detector Schematic in Proteus: LED Output Not Working in Simulation

Hello everyone, I had a trouble with my schematic for metal detector using Integrated Circuit 555 timer. I think my schematic in Proteus wrong. Because,when i designed it on breadboard, it didn't work. I added some led to output, not just a buzzer that i found on internet. I will attach a pictures on attachments original schematic i found on internet and my schematic. Also, i have a trouble when run simulation on my schematic, my led not turn on.Maybe, you can help me. Thank you very much for your reply.

Hello Banu;
With a 6 to 12 volt supply, your LED resistor, R1, would need to be around 680 ohms, not 220K. I'm not sure about the buzzer working. It depends on it's required drive voltage and current.
Try it with a 680 ohm resistor for your LED and with the buzzer disconnected. To get a more exact resistor value, search Google for "led resistor calculator."

Hi Banu-Duane is correct, but let me add that in the original schematic, the audible device is a speaker or piezo transducer, not a buzzer. In your design you show a buzzer, which will not work.  Most buzzers include a self-oscillating circuit, and in this case the 555 is the oscillator, so you don't want one in the buzzer. Also, be aware that a piezo device may not be a good choice, because the audio output of the metal detector will vary in pitch, but the piezo transducers are very resonant at one particular frequency. I think a speaker will work best.-Rick