I change the resistors from transistors base with 2k2 instead 4k7; nothing !!!
I change the transistors (BC337) with others (2SC1815; 2SC9014) but the results are all the time the same : after couple of pressing on but1 OR but2 (doesn't matter !) but2 (and rel2) works fine but but1 (rel1-of course) became inopperating !
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