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This circuit can pick up EM waves with an antenna I simulated using some AC sources. Change the capacitance of the capacitor in the LC tuner (left circle) to set what frequency to pick up. Tested values: 4, 100, 400. NOTE: The frequency picked up at 400 (500 Hz) is so low, that the resonance given is pretty insignificant and thus can‘t detect signals in that range. (I think).
It is attached to a simple rectifier (instead of a single diode) to make the light bulb work better (otherwise, for sound, the circuit would be the same without the rectifier). This circuit doesn‘t require any electricity, and can be constructed at home with few materials. Even without an electrical amplifier, one can use Detectoring Recievers to pick up and hear radio waves for example, if connected to a speaker.
The main principle this circuit takes advantage of is resonance. If the oscillating frequency of the LC tuner (set by the capacitor) is similar to a frequency picked up by an antenna, that frequency is amplified to a point where all other frequencies are overshadowed by the amplified one, which is akin to „selecting“ a frequency. When however the LC tuner oscillates at a frequency not similar to any of the ones picked up by the antenna, nothing goes through as A. there is no selected frequency from the chaotic mix and B. no frequency is amplified to a high-enough amplitude. This behaviour is replicated perfectly in the circuit.
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