How TVs/Radios Tune – Resonance Selectivity

Ever wonder how a radio, TV, cell phone, etc. can pick 1 channel out of an almost infinite number of frequencies? From crystal radio to 4G digital phones, selectivity is key.

– Frequency generator
– Oscilloscope (cheap USB works)
– Inductor
– Capacitor

– I did not use the ground from the frequency generator, just the positive output. “Full power” over drives things and makes it hard to see the transitions.


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