I'm building a small radio transmitter based on a 555 timer. In my circuit a 555 timer in astable mode is used as an oscillator. kind off like : http://www.instructables.com/id/555-AM-Transmitter/
From what i understand a 555 Timer in astable mode outputs a "Pulsed DC" signal (HIGH LOW HIGH LOW, but never goes negative).
And a "AC" signal is needed to drive an antenna for electromagnetic radiation to occur, Is this correct?
Or can a "Pulsating DC" signal just as well be used for radio transmission? In the instructables project the "Pulsed DC" is directly used to drive the antenna. How does this work?
thanks in advance,