#3717
LectronFan
Moderator

Hi Michael !

Thank you for the link and the comparison between the radio modules. I have one of those  FM radio modules and together with the improved speakerbox and 3 stage amplifier, it forms a really well functioning FM radio with amazing selectivity, no noise and great sound ! And it even works with no antenna attached !

Here is a picture of the setup :

FM radio setup

And here is a comparison between the two speakers. I used the 3 stage amplifier to test the new larger speaker against the original small speaker in the box. A signal was introduced into the amplifier. This was a sine wave going from 150Hz to 15kHz. You notice that the larger speaker has more low and mid range. The small speaker has only high end (peaking at max around 4kHz). Strangely enough the larger speaker reduces this 4kHz, resulting in a warm sound.

Speaker comparison

And here is a close up picture of the new speaker inside the box :

New speaker

Greetings

  • This reply was modified 2 years, 11 months ago by Michael.
  • This reply was modified 2 years, 11 months ago by Michael.
  • This reply was modified 2 years, 5 months ago by Michael.