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Actually, I'm new in electronics and I have made this circuit not to get a good quality audio, but to learn something new and turn on old speakers. The next step for me is better stereo amplifier which can handle my speakers. Do you have any circuit diagram like that which costs less than 10-15$? In diagram from this topic, the most expensive ones were MOSFET (~1,7$) and radiators (~1,5$).
I forced the phone to play audio through jack, and... It works! But I think it's not enough for my speakers, because they are playing quietly (as for them), and I can hear that sound is not 100% clear. Is there a way to extend the circuit to fix it?
I use 12V cable from an old 400W PC PSU to power the circuit. Maybe 12V for stereo is not enough? When I connect it to PSU, both light bulbs turn on, and speakers are doing funny noise for a split second (that's normal, it means they turned on). When I plug jack into phone, the same thing happens. But when I play the music, it plays from phone, not from speakers.After connecting wire, bulbs turn off. So both MOSFETs are working properly. I will try to make it again on the breadboard, maybe I have just done something wrong.