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RE: Inside a basic AM/FM Radio Receiver
Hey really nice post i wanted to ask like u said if u really dont need a voltage to get the fm signal that mean some radios without speakers just come with a pair of large amplifiers ?
I've seen some very cheap radios (one FM receiver from the dollar store, which I've only seen sold there once or I would have bought more) come without a speaker. The amplifier is still there, you just have to use a set of headphones and plug them into the radio to hear anything. The lack of speaker is just a way to save money.
Crystals radios on the other hand can produce sound from a speaker using only the energy in AM radio waves, so they don't need batteries. But the sound is extremely quiet.