I looked on instructables and I found an interesting(at least for me) AM transmitter made with a 555 timer which acts as the oscillator:http://www.instructables.com/id/555-AM-Transmitter/ Is this idea feasible?Will it work?
No, it's rubbish: -
Look at the circuit - where do you connect a modulating input (such as a microphone or signal generator) - if you attached its output to an antenna it would be creating so many harmonics the whole of the AM broadcast band would be corrupted in the near vicinity.
Accepting that it's likely illegal to connect an antenna to the circuit there are far more practical circuits around like this: -
Taken from here. Or, there is this FM (not AM) one: -
Taken from here. Just Google "Simple AM transmitter" and look at the images of circuits you get. Choose one that is within your capabilities and go to the source page for instructions and help.
I see no capacitor in the schematic (where there should be one for normal operation) so it probably works on parasitic capacitances of which there will be plenty on a breadboard.
The 555 timer is not meant to be used at 500 kHz or higher. There's no antenna connected which is actually good because if the circuit worked you'd be transmitting illegally.
Sure it might "work" but more as a toy/gimmick than anything else. And if your 555 would be from a different manufacturer the circuit might not work at all. I call that bad design !
There are better projects to spend your time on.
Yeah, it'd work but not well.
a 555 can run at 1MHz, which is the middle of the AM band,
There's no capacitor, but the parasitic capacitance between the parts and ground is enough for it to run.
if you build it you'll have a low power output AM transmitter that drifts like a balloon and spams several harmonic frequencies. and is illegal to use as a transmitter almost everywhere