Now I was able to Nyan!! I have used a 32 Ohm loudspeaker in series with a 220uF capacitor instead of the piezo buzzer.
It was necessary to put a 100nf between the VCC and GND of the microprocessor, otherwise it runs erratically.
Thanks again @Radomir Dopieralski for the board and for the code.
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Nice component packing there!
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Thanks!
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