> I just build the project shown here http://www.af2cw.com/cw/CW%20With%20Your%20HT.pdf
> but for some reason, the speaker now sounds very weird
> when I turn up the volume. (it sounds like scratchy
> noise or something.
> The battery is fine. It was working before. Im not
> sure if there anything wrong with the solder joints.
> Anyone know what can cause the sound to go like that?
I think I built one of those a long time ago. Neat little project.
When the volume is turned up, the output of the little
555 IC is swamped by the speaker impedance (8 ohms), I
believe. Try some headphones (regular ear-cup models
are around 32 ohms), or some ear-buds (they vary from
320 ohms and UP...).
Or, if you can, just add an LM386 IC and provide some
additional output for the speaker.