Author Options:

How Do I Build a Radio? Answered

I know very little about electronics but have always wanted to build a radio. I think it might get me more interested in electronics to build a radio.  I have plenty of parts from old, broken radios and r/c stuff.  So, does anyone have any suggestion/ can offer help (I have patches to send). Again, I know very little about electronics.  Thanks!

3 Replies

steveastroukBest Answer (author)2011-07-02

See if you can find a copy of the book "Voice of the Crystal" I
I don't think there is a better book on making a basic radio.


Select as Best AnswerUndo Best Answer

framistan (author)2011-07-02

It is fairly simple to build a radio TRANSMITTER. It might be more fun to build a transmitter and it will help you to understand radio receiver operation. A transmitter is simply an OSCILLATOR. Then an audio amplifier (one transistor) is used to modulate the signal strength of the oscillator. If the oscillator is set at an AM frequency, then you will hear the audio sounds in the AM radio. FM is a little more difficult because the FREQUENCY must be modulated, not the AMPLITUDE (signal strength). That is why they call it "AM" and "FM".... amplitude modulation & frequency modulation.

If you build a radio receiver, better stick to a crystal radio. A real receiver uses several separate circuits that all work together to get it to work. There is the RF amplifier section... the local oscillator... the detector...the mixer... the demodulator... then the audio amplifier... then the speaker. It might be a bit overwhelming. If you start simple then you can accomplish a good understanding.

Select as Best AnswerUndo Best Answer

rickharris (author)2011-07-02

From a lot of bits this isn't easy - many not be difficult - A crystal radio is the easiest first start and will allow you to get a feel for what is happening, you can add amplification and better selectivity later.

For what it costs buying a kit is actually easier than trying to strip parts from old kit.

Actually once you understand a bit more you may well be able repair those old broken radios.


Select as Best AnswerUndo Best Answer