My remotes are quiet/silent. Can barely here a hum with my ear right next to the remote. A friend of mine says his are so noisy he can here his remotes when he is not in the room. I am wondering if I am getting a weak signal?

The lower the amplitude, the lower the volume. Also, if the frequency is under 20, or over 20,000 Hz, you won't hear it.

Make sure everything is soldered correctly.
Their should be around a 4mm gap between the top and bottom boards on the remote and these should be fixed with solder joints. Make sure that there is no 'give' in the board by Gently sqeezing them.

For the sound you can also try putting in frequency of around 40Hz and do a 15 stage fibonacci frequency wobble - you should here it go through different tones.
It isn't too loud but it should be there.

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