first please excuse my bad english, it’s not my mother tongue.
Second, makerbuino it’ s great, my first real soldering and yes I made a mistake, I mixed up the transistor and voltage regulator and damaged them while I tried to desolder them. But thanks for the good design of the PCB I bought them new and soldered them again, this time correct.
Everything now is working, except the speaker and switch SW2 - what can be the mistake? Headphone connector socket is working inclusive volume control. As I looked in the diagram I got some ideas
a) I solderd SW2 not correct
b) I solderd the diode in the wrong direction, can this be if the headphone connector socket is working correct?
c) I soldered the cables/soundspeaker wrong
Can I measure a, b or c? I have a voltmeter.
Update: I testet the loudspeaker with a 1,2 Volt Mignon Akku and heard some scratching noises. It seems to work proper.
Thank you very much for your reply and help.