Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

As per this building simple radio it is the simplest AM radio receiver.


obviously this is very poor AM receiver.(but it was working for someone in comment)

I'm wondering what will happen when this receiver is very near to FM radios transmitter? will it work?

if no, How will the simplest FM radio receiver look like?

share|improve this question
Don't edit follow up questions into the actual one. If you have a new question, ask a new question. – PlasmaHH Feb 14 at 0:04
need to wait 4 days for next question :( – editinit Feb 14 at 0:13
up vote 6 down vote accepted

For a totally passive FM set you can use something like a resonant circuit that is tuned somewhat off the carrier frequency so variations in carrier frequency result in changes in output voltage from the detector at the baseband frequency. This is called 'slope detection'.

For example, from this website:

This should also work to pick up AM signals.

enter image description here

An even simpler circuit is presented here.

enter image description here

share|improve this answer
I was just about to post the second one. – Passerby Feb 13 at 22:42

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.