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Topic: Simplest AM radio receiver (Read 8 times) previous topic - next topic

Runaway Pancake


so in the lc circuit i can either keep a variable cap or a variable inductor?

Yes!
Most car radios used to use a variable inductor, less subject to drift vs. temperature compared to a variable capacitor.
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adilmalik

Okay i think i understand now. So the resonant frequency of my LC circuit should cover the AM range?

Grumpy_Mike

This shows you step by step from just household items.
http://scitoys.com/scitoys/scitoys/radio/homemade_radio.html

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(can i use any rectifier diode?

You can but will be able to pick up more stations if you use a germanium diode in place of a rectifying silicon one.

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So the resonant frequency of my LC circuit should cover the AM range?

Yes

adilmalik

thank you again, i finally understand this. 1 more question please, now i know that LC circuits are used during reception of Am but are they also used to transmit RF? example: if i transmit a blank carrier wave and connect it to a LC circuit?

Grumpy_Mike

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but are they also used to transmit RF

They can be if they are part of the oscillator that generates the carrier.
If you have something like a crystal oscillator then you don't need them.

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