LM3915 10 LED الصوت محلل الطيف الصوتي مجموعة مؤشر المستوى لتقوم بها بنفسك مجموعة ممارسة لحام الإلكترونيات

It comes without instructions.

Disappointed, 2 pieces are missing

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When soldering, contact areas for soldering come off. I don't know what's wrong, maybe the heat is set too high. soldering iron is not adjustable. You need to order a soldering kit. with a good soldering iron with good temperature regulation. I repeat once again - the board is of poor quality. when overheated, the contact tracks come off.